1
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Salatto D, Carrillo JMY, Endoh MK, Taniguchi T, Yavitt BM, Masui T, Kishimoto H, Tyagi M, Ribbe AE, Garcia Sakai V, Kruteva M, Sumpter BG, Farago B, Richter D, Nagao M, Koga T. Structural and Dynamical Roles of Bound Polymer Chains in Rubber Reinforcement. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01239] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Tomomi Masui
- Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Hiroyuki Kishimoto
- Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Alexander E. Ribbe
- Department for Polymer Science & Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Victoria Garcia Sakai
- ISIS Pulsed Neutron and Muon Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, U.K
| | - Margarita Kruteva
- Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bela Farago
- Institut Laue−Langevin, 6 rue Jules Horowitz, BP 156-38042, Grenoble Cedex 9 38000, France
| | - Dieter Richter
- Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Michihiro Nagao
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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2
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Zhou Y, Yavitt BM, Zhou Z, Bocharova V, Salatto D, Endoh MK, Ribbe AE, Sokolov AP, Koga T, Schweizer KS. Bridging-Controlled Network Microstructure and Long-Wavelength Fluctuations in Silica–Poly(2-vinylpyridine) Nanocomposites: Experimental Results and Theoretical Analysis. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01391] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yuxing Zhou
- Department Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Zhengping Zhou
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Vera Bocharova
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Alexander E. Ribbe
- Department for Polymer Science & Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Alexei P. Sokolov
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Kenneth S. Schweizer
- Department Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, United States
- Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, United States
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
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3
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Salatto D, Koga YT, Bajaj Y, Huang Z, Yavitt BM, Meng Y, Carrillo JMY, Sumpter BG, Nykypanchuk D, Taniguchi T, Endoh MK, Koga T. Generalized Protein-Repellent Properties of Ultrathin Homopolymer Films. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yuto T. Koga
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York 14853, United States
| | - Yashasvi Bajaj
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Zhixing Huang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yizhi Meng
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Dmytro Nykypanchuk
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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4
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Endoh MK, Morimitsu Y, Salatto D, Huang Z, Sen M, Li W, Meng Y, Thanassi DG, Carrillo JMY, Sumpter BG, Kawaguchi D, Tanaka K, Koga T. Protein Resistance Driven by Polymer Nanoarchitecture. ACS Macro Lett 2019; 8:1153-1159. [PMID: 35619442 DOI: 10.1021/acsmacrolett.9b00518] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We report that the nanometer-scale architecture of polymer chains plays a crucial role in its protein resistant property over surface chemistry. Protein-repellent (noncharged), few nanometer thick polymer layers were designed with homopolymer chains physisorbed on solids. We evaluated the antifouling property of the hydrophilic or hydrophobic adsorbed homopolymer chains against bovine serum albumin in water. Molecular dynamics simulations along with sum frequency generation spectroscopy data revealed the self-organized nanoarchitecture of the adsorbed chains composed of inner nematic-like ordered segments and outer brush-like segments across homopolymer systems with different interactions among a polymer, substrate, and interfacial water. We propose that this structure acts as a dual barrier against protein adsorption.
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Affiliation(s)
- Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yuma Morimitsu
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Zhixing Huang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Mani Sen
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Weiyi Li
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yizhi Meng
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - David G. Thanassi
- Department of Molecular Genetics & Microbiology and Center for Infectious Diseases, Stony Brook University, Stony Brook, New York 11794-5222, United States
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Daisuke Kawaguchi
- Education Center for Global Leaders in Molecular Systems for Devices, Kyushu University, Fukuoka 819-0395, Japan
| | - Keiji Tanaka
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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5
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Morimitsu Y, Salatto D, Jiang N, Sen M, Nishitsuji S, Yavitt BM, Endoh MK, Subramanian A, Nam CY, Li R, Fukuto M, Zhang Y, Wiegart L, Fluerasu A, Tanaka K, Koga T. “Structurally Neutral” Densely Packed Homopolymer-Adsorbed Chains for Directed Self-Assembly of Block Copolymer Thin Films. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00597] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuma Morimitsu
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan
| | - Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Naisheng Jiang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Mani Sen
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Shotaro Nishitsuji
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Ashwanth Subramanian
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Chang-Yong Nam
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - Ruipeng Li
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Masafumi Fukuto
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Yugang Zhang
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Lutz Wiegart
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Andrei Fluerasu
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Keiji Tanaka
- Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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6
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Jiang N, Di X, Salatto D, Nam CY, Fukuto M, Endoh MK, Koga T. Self-Organization of Triblock Copolymer Melt Chains Physisorbed on Non-neutral Surfaces. ACS Omega 2018; 3:17805-17813. [PMID: 31458377 PMCID: PMC6644122 DOI: 10.1021/acsomega.8b02912] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 12/06/2018] [Indexed: 06/10/2023]
Abstract
We here report the self-organization process of poly(styrene-b-ethylene/butadiene-b-styrene) (SEBS) triblock copolymer chains physically adsorbed on a non-neutral surface. Spin-cast SEBS thin films were prepared on silicon (Si) substrates and then annealed at a high temperature far above the bulk glass transition temperatures of the two constituent blocks. To reveal the buried interfacial structure, we utilized solvent rinsing processes and a suite of surface-sensitive techniques including ellipsometry, X-ray reflectivity, atomic force microscopy, and grazing incidence small angle X-ray scattering. We revealed that the SEBS chains form two different chain structures on the substrate simultaneously: (i) "flattened chains" with the average height of 2.5 nm but without forming microdomain structures; (ii) "loosely adsorbed chains" with the average height of 11.0 nm and the formation of perpendicularly oriented cylindrical microdomains to the substrate surface. In addition, the kinetics to form the perpendicular-oriented cylinder was sluggish (∼200 h) and proceeded via multistep processes toward the equilibrium state. We also found that the lateral microdomain structures were distorted, and the characteristic lengths of the microdomains were slightly different from the bulk even after reaching "quasiequilibrium" state within the observed time window. Furthermore, we highlight the vital role of the adsorbed chains in the self-assembling process of the entire SEBS thin film: a long-range perturbation associated with the adsorbed chains propagates into the film interior, overwhelming the free surface effect associated with surface segregation of the lower surface tension of polystyrene blocks.
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Affiliation(s)
- Naisheng Jiang
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Xiaoyu Di
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Daniel Salatto
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Chang-Yong Nam
- Center
for Functional Nanomaterials, Brookhaven
National Laboratory, Upton, New York 11973-5000, United States
| | - Masafumi Fukuto
- National
Synchrotron Light Source II, Brookhaven
National Laboratory, Upton, New York 11973, United States
| | - Maya K. Endoh
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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7
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Koga T, Barkley D, Nagao M, Taniguchi T, Carrillo JMY, Sumpter BG, Masui T, Kishimoto H, Koga M, Rudick JG, Endoh MK. Interphase Structures and Dynamics near Nanofiller Surfaces in Polymer Solutions. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01615] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | | | - Michihiro Nagao
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Tomomi Masui
- Sumitomo Rubber
Industries
Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Hiroyuki Kishimoto
- Sumitomo Rubber
Industries
Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Maho Koga
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
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8
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Bahng G, Endoh MK, Ryu J, Hwang J. Crystalline structure and mechanical properties of poly(ethylene terephthalate) filament embedded with nanosize clay particles. J Appl Polym Sci 2018. [DOI: 10.1002/app.46321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- GunWoong Bahng
- Department of Mechanical Engineering; The State University of New York; Korea Incheon 21985 Korea
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering; Stony Brook University; Stony Brook New York 11794
| | - Jisu Ryu
- Institute of Advanced Composite Materials; Korea Institute of Science and Technology; Jeonju 55324 Korea
| | - Junyeon Hwang
- Institute of Advanced Composite Materials; Korea Institute of Science and Technology; Jeonju 55324 Korea
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9
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Jiang N, Sen M, Zeng W, Chen Z, Cheung JM, Morimitsu Y, Endoh MK, Koga T, Fukuto M, Yuan G, Satija SK, Carrillo JMY, Sumpter BG. Structure-induced switching of interpolymer adhesion at a solid-polymer melt interface. Soft Matter 2018; 14:1108-1119. [PMID: 29340434 DOI: 10.1039/c7sm02279d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Here we report a link between the interfacial structure and adhesive property of homopolymer chains physically adsorbed (i.e., via physisorption) onto solids. Polyethylene oxide (PEO) was used as a model and two different chain conformations of the adsorbed polymer were created on silicon substrates via the well-established Guiselin's approach: "flattened chains" which lie flat on the solid and are densely packed, and "loosely adsorbed polymer chains" which form bridges jointing up nearby empty sites on the solid surface and cover the flattened chains. We investigated the adhesion properties of the two different adsorbed chains using a custom-built adhesion testing device. Bilayers of a thick PEO overlayer on top of the flattened chains or loosely adsorbed chains were subjected to the adhesion test. The results revealed that the flattened chains do not show any adhesion even with the chemically identical free polymer on top, while the loosely adsorbed chains exhibit adhesion. Neutron reflectivity experiments corroborated that the difference in the interfacial adhesion is not attributed to the interfacial brodening at the free polymer-adsorbed polymer interface. Instead, coarse-grained molecular dynamics simulation results suggest that the tail parts of the loosely adsorbed chains act as "connector molecules", bridging the free chains and substrate surface and improving the interfacial adhesion. These findings not only shed light on the structure-property relationship at the interface, but also provide a novel approach for developing sticking/anti-sticking technologies through precise control of the interfacial polymer nanostructures.
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Affiliation(s)
- Naisheng Jiang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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10
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Sen M, Jiang N, Endoh MK, Koga T, Ribbe A, Rahman A, Kawaguchi D, Tanaka K, Smilgies DM. Locally Favored Two-Dimensional Structures of Block Copolymer Melts on Nonneutral Surfaces. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02506] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mani Sen
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275,United States
| | - Naisheng Jiang
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275,United States
| | - Maya K. Endoh
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275,United States
| | - Tadanori Koga
- Department
of Materials Science and Chemical Engineering, Stony Brook University, Stony
Brook, New York 11794-2275,United States
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Alexander Ribbe
- Department
of Polymer Science and Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Atikur Rahman
- Department
of Physics, Indian Institute of Science Education and Research (IISER) Pune 411008, India
| | | | | | - Detlef-M. Smilgies
- Cornell High
Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States
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11
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Affiliation(s)
- Naisheng Jiang
- Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794‐2275 USA
| | - JustinM. Cheung
- Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794‐2275 USA
| | - Yichen Guo
- Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794‐2275 USA
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794‐2275 USA
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794‐2275 USA
- Department of Chemistry Stony Brook University Stony Brook NY 11794‐3400 USA
| | - Guangcui Yuan
- Center for Neutron Research National Institute of Standards and Technology Gaithersburg MD 20899 USA
| | - Sushil K. Satija
- Center for Neutron Research National Institute of Standards and Technology Gaithersburg MD 20899 USA
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12
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Barkley DA, Jiang N, Sen M, Endoh MK, Rudick JG, Koga T, Zhang Y, Gang O, Yuan G, Satija SK, Kawaguchi D, Tanaka K, Karim A. Chain Conformation near the Buried Interface in Nanoparticle-Stabilized Polymer Thin Films. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01187] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | | | | | | | | | | | | | - Oleg Gang
- Department
of Chemical Engineering and Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
| | - Guangcui Yuan
- Center for
Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Sushil K. Satija
- Center for
Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | | | | | - Alamgir Karim
- College of
Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio 44325-0301, United States
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13
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Jiang N, Sendogdular L, Sen M, Endoh MK, Koga T, Fukuto M, Akgun B, Satija SK, Nam CY. Novel Effects of Compressed CO 2 Molecules on Structural Ordering and Charge Transport in Conjugated Poly(3-hexylthiophene) Thin Films. Langmuir 2016; 32:10851-10860. [PMID: 27709955 DOI: 10.1021/acs.langmuir.6b03239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the effects of compressed CO2 molecules as a novel plasticization agent for poly(3-hexylthiophene) (P3HT)-conjugated polymer thin films. In situ neutron reflectivity experiments demonstrated the excess sorption of CO2 molecules in the P3HT thin films (about 40 nm in thickness) at low pressure (P = 8.2 MPa) under the isothermal condition of T = 36 °C, which is far below the polymer bulk melting point. The results proved that these CO2 molecules accelerated the crystallization process of the polymer on the basis of ex situ grazing incidence X-ray diffraction measurements after drying the films via rapid depressurization to atmospheric pressure: both the out-of-plane lamellar ordering of the backbone chains and the intraplane π-π stacking of the side chains were significantly improved, when compared with those in the control P3HT films subjected to conventional thermal annealing (at T = 170 °C). Electrical measurements elucidated that the CO2-annealed P3HT thin films exhibited enhanced charge carrier mobility along with decreased background charge carrier concentration and trap density compared with those in the thermally annealed counterpart. This is attributed to the CO2-induced increase in polymer chain mobility that can drive the detrapping of molecular oxygen and healing of conformational defects in the polymer thin film. Given the universality of the excess sorption of CO2 regardless of the type of polymers, the present findings suggest that CO2 annealing near the critical point can be useful as a robust processing strategy for improving the structural and electrical characteristics of other semiconducting conjugated polymers and related systems such as polymer:fullerene bulk heterojunction films.
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Affiliation(s)
- Naisheng Jiang
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794-2275, United States
| | - Levent Sendogdular
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794-2275, United States
| | - Mani Sen
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794-2275, United States
| | - Maya K Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States
| | - Masafumi Fukuto
- National Synchrotron Light Source II, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Bulent Akgun
- Department of Chemistry, Bogazici University , Bebek, Istanbul 34342, Turkey
| | - Sushil K Satija
- Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
| | - Chang-Yong Nam
- Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973-5000, United States
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14
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Abstract
We report the structural relaxation process of irreversibly adsorbed polymer chains via thermal annealing that lie flat on a solid ("flattened chains"). Amorphous polystyrene and quartz, which together constitute a weakly attractive system, was used as a model where the local chain conformations of the flattened chains were investigated by sum frequency generation spectroscopy (SFG). Two different film preparation processes (i.e., spin coating and dip coating methods) were utilized to create different initial chain conformations. The spin-coated and dip-coated PS thin films were annealed at a temperature far above the bulk glass transition temperature to reach the "quasiequilibrium" state and subsequently rinsed with chloroform to uncover the buried flattened chains. The SFG results revealed that the backbone chains (constituted of CH and CH2 groups) of the flattened PS chains preferentially orient to the weakly interactive substrate surface via thermal annealing regardless of the initial chain conformations, while the orientation of the phenyl rings becomes randomized. We postulate that increasing the number of surface-segmental contacts (i.e., enthalpic gain) is the driving force for the flattening process of the polymer chains, even onto a weakly interactive solid to overcome the conformational entropy loss in the total free energy.
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Affiliation(s)
| | | | | | | | - Tadanori Koga
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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15
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Jiang N, Wang J, Di X, Cheung J, Zeng W, Endoh MK, Koga T, Satija SK. Nanoscale adsorbed structures as a robust approach for tailoring polymer film stability. Soft Matter 2016; 12:1801-9. [PMID: 26685723 DOI: 10.1039/c5sm02435h] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The stability or wettability of thin polymer films on solids is of vital interest in traditional technologies as well as in new emerging nanotechnologies. We report here that nanoscale structures of polymer chains adsorbed onto a solid surface play a crucial role in the thermal stability of the film. In this study, polystyrene (PS) spin-cast films (20 nm in thickness) with eight different molecular weights prepared on silicon (Si) substrates were used as a model. When low molecular weight (Mw≤ 50 kDa) PS films were subjected to thermal annealing at temperatures far above the bulk glass transition temperature, dewetting occurred promptly, while high molecular weight (Mw≥ 123 kDa) PS films were stable for at least 6 weeks at 150 °C. We reveal a strong correlation between the film stability and the two different interfacial structures of the adsorbed polymer chains: their opposing wettability against chemically identical free polymer chains results in a wetting-dewetting transition at the adsorbed polymer-free polymer interface. This is a unique aspect of the stability of polymer thin films and may be generalizable to other polymer systems regardless of the magnitude of solid-polymer attractive interactions.
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Affiliation(s)
- Naisheng Jiang
- Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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16
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Jiang B, Nykypanchuk D, Endoh MK, Chen X, Qian B, Kisslinger K, Koga T, Parise JB, Grubbs RB. Phase Behavior of Alkyne-Functionalized Styrenic Block Copolymer/Cobalt Carbonyl Adducts and in Situ Formation of Magnetic Nanoparticles by Thermolysis. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02515] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | - Dmytro Nykypanchuk
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | | | | | | | - Kim Kisslinger
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
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17
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18
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Jiang N, Endoh MK, Koga T, Masui T, Kishimoto H, Nagao M, Satija SK, Taniguchi T. Nanostructures and Dynamics of Macromolecules Bound to Attractive Filler Surfaces. ACS Macro Lett 2015; 4:838-842. [PMID: 35596506 DOI: 10.1021/acsmacrolett.5b00368] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report in situ nanostructures and dynamics of polybutadiene (PB) chains bound to carbon black (CB) fillers (the so-called "bound polymer layer (BPL)") in a good solvent. The BPL on the CB fillers was extracted by solvent leaching of a CB-filled PB compound and subsequently dispersed in deuterated toluene to label the BPL for small-angle neutron scattering and neutron spin echo techniques. The results demonstrate that the BPL is composed of two regions regardless of molecular weights of PB: the inner unswollen region of ≈ 0.5 nm thick and outer swollen region where the polymer chains display a parabolic profile with a diffuse tail. In addition, the results show that the dynamics of the swollen bound chains can be explained by the so-called "breathing mode" and is generalized with the thickness of the swollen BPL.
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Affiliation(s)
| | | | | | - Tomomi Masui
- Sumitomo
Rubber
Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe, 671-0027, Japan
| | - Hiroyuki Kishimoto
- Sumitomo
Rubber
Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe, 671-0027, Japan
| | - Michihiro Nagao
- NIST
Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Center for
Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408, United States
| | - Sushil K. Satija
- NIST
Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
| | - Takashi Taniguchi
- Graduate
School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto, 615-8510, Japan
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19
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Jiang N, Sendogdular L, Di X, Sen M, Gin P, Endoh MK, Koga T, Akgun B, Dimitriou M, Satija S. Effect of CO2 on a Mobility Gradient of Polymer Chains near an Impenetrable Solid. Macromolecules 2015. [DOI: 10.1021/ma502591x] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | - Maya K. Endoh
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Tadanori Koga
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
| | - Bulent Akgun
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Chemistry, Bogazici University, Bebek, Istanbul 34342, Turkey
| | - Michael Dimitriou
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Sushil Satija
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
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20
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Yang L, Tyburski BA, Dos Santos FD, Endoh MK, Koga T, Huang D, Wang Y, Zhu L. Relaxor Ferroelectric Behavior from Strong Physical Pinning in a Poly(vinylidene fluoride-co-trifluoroethylene-co-chlorotrifluoroethylene) Random Terpolymer. Macromolecules 2014. [DOI: 10.1021/ma501852x] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Lianyun Yang
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
| | - Brady A. Tyburski
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
| | | | - Maya K. Endoh
- Department
of Materials Science and Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department
of Materials Science and Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Daniel Huang
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
| | - Yijun Wang
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
| | - Lei Zhu
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
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21
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Gowd EB, Koga T, Endoh MK, Kumar K, Stamm M. Pathways of cylindrical orientations in PS-b-P4VP diblock copolymer thin films upon solvent vapor annealing. Soft Matter 2014; 10:7753-7761. [PMID: 25142254 DOI: 10.1039/c4sm01460j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The orientation changes of perpendicular cylindrical microdomains in polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) thin films upon annealing in different solvent vapors were investigated by in situ grazing incidence small-angle X-ray scattering (GISAXS) and ex situ scanning force microscopy (SFM). The swelling of P4VP perpendicular cylinders (C⊥) in chloroform, a non-selective solvent vapor, leads to the reorientation to in-plane cylinders through a disordered state in a particular kinetic pathway in the phase diagram upon drying. On the other hand, the swelling of the P4VP perpendicular cylinders in a selective solvent vapor (i.e., 1,4-dioxane) induces a morphological transition from cylindrical to ellipsoidal as a transient structure to spherical microdomains; subsequent solvent evaporation resulted in shrinkage of the matrix in the vertical direction, merging the ellipsoidal domains into the perpendicularly aligned cylinders. In this paper, we have discussed the mechanism based on the selectivity of the solvent to the constituting blocks that is mainly responsible for the orientation changes.
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Affiliation(s)
- E Bhoje Gowd
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum-695 019, Kerala, India.
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22
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Asada M, Jiang N, Sendogdular L, Sokolov J, Endoh MK, Koga T, Fukuto M, Yang L, Akgun B, Dimitriou M, Satija S. Melt crystallization/dewetting of ultrathin PEO films via carbon dioxide annealing: the effects of polymer adsorbed layers. Soft Matter 2014; 10:6392-6403. [PMID: 24930998 DOI: 10.1039/c4sm00683f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The effects of CO2 annealing on the melting and subsequent melt crystallization processes of spin-cast poly(ethylene oxide) (PEO) ultrathin films (20-100 nm in thickness) prepared on Si substrates were investigated. By using in situ neutron reflectivity, we found that all the PEO thin films show melting at a pressure as low as P = 2.9 MPa and at T = 48 °C which is below the bulk melting temperature (Tm). The films were then subjected to quick depressurization to atmospheric pressure, resulting in the non-equilibrium swollen state, and the melt crystallization (and/or dewetting) process was carried out in air via subsequent annealing at given temperatures below Tm. Detailed structural characterization using grazing incidence X-ray diffraction, atomic force microscopy, and polarized optical microscopy revealed two unique aspects of the CO2-treated PEO films: (i) a flat-on lamellar orientation, where the molecular chains stand normal to the film surface, is formed within the entire film regardless of the original film thickness and the annealing temperature; and (ii) the dewetting kinetics for the 20 nm thick film is much slower than that for the thicker films. The key to these phenomena is the formation of irreversibly adsorbed layers on the substrates during the CO2 annealing: the limited plasticization effect of CO2 at the polymer-substrate interface promotes polymer adsorption rather than melting. Here we explain the mechanisms of the melt crystallization and dewetting processes where the adsorbed layers play vital roles.
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Affiliation(s)
- Mitsunori Asada
- Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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23
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Pan M, Yang L, Wang J, Tang S, Zhong G, Su R, Sen MK, Endoh MK, Koga T, Zhu L. Composite Poly(vinylidene fluoride)/Polystyrene Latex Particles for Confined Crystallization in 180 nm Nanospheres via Emulsifier-Free Batch Seeded Emulsion Polymerization. Macromolecules 2014. [DOI: 10.1021/ma500249p] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Mingwang Pan
- Institute
of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, P. R. China
| | - Lianyun Yang
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
| | - Jianchuan Wang
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
- College
of Polymer Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
| | - Saide Tang
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
| | - Ganji Zhong
- College
of Polymer Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
| | - Run Su
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
- College
of Polymer Science and Engineering, Sichuan University, Chengdu 610065, P. R. China
| | - Mani K. Sen
- Department
of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Maya K. Endoh
- Department
of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department
of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Lei Zhu
- Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
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24
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Affiliation(s)
- Naisheng Jiang
- Department
of Materials Science and Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Jun Shang
- Department
of Materials Science and Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Xiaoyu Di
- Department
of Materials Science and Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Maya K. Endoh
- Department
of Materials Science and Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department
of Materials Science and Engineering, Stony Brook University, Stony
Brook, New York 11794-2275, United States
- Chemical
and Molecular Engineering Program, Stony Brook University, Stony
Brook, New York 11794-2275, United States
- Department
of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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25
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Gin P, Jiang N, Liang C, Taniguchi T, Akgun B, Satija SK, Endoh MK, Koga T. Revealed architectures of adsorbed polymer chains at solid-polymer melt interfaces. Phys Rev Lett 2012; 109:265501. [PMID: 23368578 DOI: 10.1103/physrevlett.109.265501] [Citation(s) in RCA: 171] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 10/22/2012] [Indexed: 05/26/2023]
Abstract
We report the chain conformations of polymer molecules accommodated at the solid-polymer melt interfaces in equilibrium. Polystyrene "Guiselin" brushes (adsorbed layers) with different molecular weights were prepared on Si substrates and characterized by using x-ray and neutron reflectivity. The results are intriguing to show that the adsorbed layers are composed of the two different nanoarchitectures: flattened chains that constitute the inner higher density region of the adsorbed layers and loosely adsorbed polymer chains that form the outer bulklike density region. In addition, we found that the lone flattened chains, which are uncovered by the additional prolonged solvent leaching (∼120 days), are reversibly densified with increasing temperature up to 150 °C. By generalizing the chain conformations of bulks, we postulate that the change in probabilities of the local chain conformations (i.e., trans and gauche states) of polymer molecules is the origin of this densification process.
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Affiliation(s)
- Peter Gin
- Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, USA
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26
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Koga T, Jiang N, Gin P, Endoh MK, Narayanan S, Lurio LB, Sinha SK. Impact of an irreversibly adsorbed layer on local viscosity of nanoconfined polymer melts. Phys Rev Lett 2011; 107:225901. [PMID: 22182035 DOI: 10.1103/physrevlett.107.225901] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Indexed: 05/26/2023]
Abstract
We report the origin of the effect of nanoscale confinement on the local viscosity of entangled polystyrene (PS) films at temperatures far above the glass transition temperature. By using marker x-ray photon correlation spectroscopy with gold nanoparticles embedded in the PS films prepared on solid substrates, we have determined the local viscosity as a function of the distance from the polymer-substrate interface. The results show the impact of a very thin adsorbed layer (~7 nm in thickness) even without specific interactions of the polymer with the substrate, overcoming the effect of a surface mobile layer at the air-polymer interface and thereby resulting in a significant increase in the local viscosity as approaching the substrate interface.
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Affiliation(s)
- Tadanori Koga
- Chemical and Molecular Engineering Program, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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27
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Koga T, Li C, Endoh MK, Narayanan S, Lurio L, Sinha SK. X-ray Photon Correlation Spectroscopy Study on Dynamics of the Free Surface in Entangled Polystyrene Melt Films. ACTA ACUST UNITED AC 2011. [DOI: 10.1088/1742-6596/272/1/012003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Koga T, Wong J, Endoh MK, Mahajan D, Gutt C, Satija SK. Hydrate formation at the methane/water interface on the molecular scale. Langmuir 2010; 26:4627-4630. [PMID: 20229992 DOI: 10.1021/la1004853] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report the nucleation process of methane hydrate on the molecular scale. A stationary planar interface separating methane gas and liquid water was studied by using in situ neutron reflectivity. We found that the angstrom-scale surface roughening is triggered as soon as the water phase contacts methane gas under the hydrate forming conditions. In addition, it was found that the microscopic surface structure remains unchanged until a macroscopic hydrate film is developed at the interface. We therefore postulate that the angstrom-scale surface roughening is attributed to the formation of microscopic hydrate "embryos" in a "dynamic equilibrium" manner.
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Affiliation(s)
- Tadanori Koga
- Chemical and Molecular Engineering Program, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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29
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Koga T, Li C, Endoh MK, Koo J, Rafailovich M, Narayanan S, Lee DR, Lurio LB, Sinha SK. Reduced viscosity of the free surface in entangled polymer melt films. Phys Rev Lett 2010; 104:066101. [PMID: 20366832 DOI: 10.1103/physrevlett.104.066101] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Indexed: 05/29/2023]
Abstract
By embedding "dilute" gold nanoparticles in single polystyrene thin films as "markers", we probe the local viscosity of the free surface at temperatures far above the glass transition temperature (T(g)). The technique used was x-ray photon correlation spectroscopy with resonance-enhanced x-ray scattering. The results clearly showed the surface viscosity is about 30% lower than the rest of the film. We found that this reduction is strongly associated with chain entanglements at the free surface rather than the reduction in T(g).
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Affiliation(s)
- Tadanori Koga
- Chemical and Molecular Engineering Program, Department of Materials Science and Engineering, Stony Brook University, Stony Brook, New York 11794-2275, USA.
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30
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Endoh MK, Takenaka M, Inoue T, Watanabe H, Hashimoto T. Shear small-angle light scattering studies of shear-induced concentration fluctuations and steady state viscoelastic properties. J Chem Phys 2008; 128:164911. [DOI: 10.1063/1.2899662] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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31
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32
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Affiliation(s)
- Maya K. Endoh
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - Shin Saito
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - Takeji Hashimoto
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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