1
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Kuriata A, Sikorski A. Structure of adsorbed linear and cyclic block copolymers: A computer simulation study. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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2
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Hu M, Li X, Heller WT, Bras W, Rzayev J, Russell TP. Using Grazing-Incidence Small-Angle Neutron Scattering to Study the Orientation of Block Copolymer Morphologies in Thin Films. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Affiliation(s)
- Mingqiu Hu
- Polymer Science and Engineering Department, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, United States
| | - Xindi Li
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - William T. Heller
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008,
MS-6473, Oak Ridge, Tennessee 37831, United States
| | - Wim Bras
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, MS-6131, Oak Ridge, Tennessee 37831, United States
| | - Javid Rzayev
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Thomas P. Russell
- Polymer Science and Engineering Department, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, United States
- Materials Science Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
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3
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Vagias A, Nelson A, Wang P, Reitenbach J, Geiger C, Kreuzer LP, Saerbeck T, Cubitt R, Benetti EM, Müller-Buschbaum P. The Topology of Polymer Brushes Determines Their Nanoscale Hydration. Macromol Rapid Commun 2023; 44:e2300035. [PMID: 36815590 DOI: 10.1002/marc.202300035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Indexed: 02/24/2023]
Abstract
Time-of-flight neutron reflectometry (ToF-NR) performed under different relative humidity conditions demonstrates that polymer brushes constituted by hydrophilic, cyclic macromolecules exhibit a more compact conformation with lower roughness as compared to linear brush analogues, due to the absence of dangling chain ends extending at the polymer-vapor interface. In addition, cyclic brushes feature a larger swelling ratio and an increased solvent uptake with respect to their linear counterparts as a consequence of the increased interchain steric repulsions. It is proposed that differences in swelling ratios between linear and cyclic brushes come from differences in osmotic pressure experienced by each brush topology. These differences stem from entropic constraints. The findings suggest that to correlate the equilibrium swelling ratios at different relative humidity for different topologies a new form of the Flory-like expression for equilibrium thicknesses of grafted brushes is needed.
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Affiliation(s)
- Apostolos Vagias
- Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, Lichtenbergstr. 1, 85748, Garching, Germany
| | - Andrew Nelson
- ANSTO, New Illawarra Road, Lucas Heights, NSW, 2234, Australia
| | - Peixi Wang
- Technical University of Munich, TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, James-Franck-Str. 1, 85748, Garching, Germany
| | - Julija Reitenbach
- Technical University of Munich, TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, James-Franck-Str. 1, 85748, Garching, Germany
| | - Christina Geiger
- Technical University of Munich, TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, James-Franck-Str. 1, 85748, Garching, Germany
| | - Lucas Philipp Kreuzer
- Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, Lichtenbergstr. 1, 85748, Garching, Germany.,Technical University of Munich, TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, James-Franck-Str. 1, 85748, Garching, Germany
| | - Thomas Saerbeck
- Institut Laue Langevin (ILL), 71 Avenue des Martyrs, Grenoble, 38000, France
| | - Robert Cubitt
- Institut Laue Langevin (ILL), 71 Avenue des Martyrs, Grenoble, 38000, France
| | - Edmondo Maria Benetti
- Polymer Surfaces Group, Department of Chemical Sciences, University of Padova, Via Marzolo 1, Padova, 35122, Italy.,Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, Zürich, 8093, Switzerland
| | - Peter Müller-Buschbaum
- Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, Lichtenbergstr. 1, 85748, Garching, Germany.,Technical University of Munich, TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, James-Franck-Str. 1, 85748, Garching, Germany
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4
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Biswas S, Yashin VV, Balazs AC. Dynamic behavior of chemically tunable mechano-responsive hydrogels. SOFT MATTER 2021; 17:10664-10674. [PMID: 34779474 DOI: 10.1039/d1sm01188j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Using theory and simulation, we model the mechanical behavior of gels that encompass loops and dangling chain ends. If the loops remain folded and dangling ends are chemically inert, then these topological features just serve as defects. If, however, the loops unfold to expose the hidden ("cryptic") binding sites and the ends of the dangling chains are reactive, these moieties can form bonds that improve the gel's mechanical properties. For gels with a lower critical solubility temperature (LCST), we systematically switch on the possible unfolding and binding events. To quantify the resulting effects, we derive equations for the gel's equilibrium and dynamic elastic moduli. We also use a finite element approach to simulate the gel's response to deformation and validate the analytic calculations. Herein, we show that the equilibrium moduli are highly sensitive to the presence of unfolding and binding transitions. The dynamical moduli are sensitive not only to these structural changes, but also to the frequency of deformation. For example, when reactive ends bind to exposed cryptic sites at T = 29 °C and relatively high frequency, the storage shear modulus is 119% greater than the corresponding equilibrium value, while the storage Young's modulus is 109% greater than at equilibrium. These findings provide guidelines for tuning the chemical reactivity of loops and dangling ends and the frequency of deformation to tailor the mechano-responsive behavior of polymer networks.
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Affiliation(s)
- Santidan Biswas
- Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA.
| | - Victor V Yashin
- Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA.
| | - Anna C Balazs
- Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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5
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Wu Z, Zhang H, Liu C, Hong C. Phototunable Cloud Point Temperatures Stemming from Cyclic Topology: Synthesis and Thermal Phase Transition Behavior of Cyclic Poly(N-acryloylsarcosine methyl ester). Macromol Rapid Commun 2021; 42:e2100136. [PMID: 33963804 DOI: 10.1002/marc.202100136] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/22/2021] [Indexed: 12/31/2022]
Abstract
Cyclic polymers possess distinct properties compared with their linear counterparts, such as smaller hydrodynamic volume, lower viscosity, and higher glass-transition temperature, etc. To explore the impact of the cyclic topology on the thermo-induced phase transition behavior of poly(N-acryloylsarcosine methyl ester) (PNASME), the anthracene-terminated telechelic PNASMEs are synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization of monomer NASME using a bifunctional chain transfer agent (CTA) with two anthryl groups. Subsequently, cyclic PNASMEs are prepared via UV-induced cyclization under 365 nm UV. There are considerable increases (up to 50 °C) for the cloud point temperatures (Tcp s) of cyclic PNASMEs compared with the linear counterparts. In view of the increment, the Tcp of PNASME is tuned by varying the cyclic/linear ratio (the molar ratio between cyclic PNASME and linear PNASME in the product) with different irradiation time.
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Affiliation(s)
- Zhigang Wu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Hualong Zhang
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Chao Liu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Chunyan Hong
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, China
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6
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Trachsel L, Romio M, Zenobi-Wong M, Benetti EM. Hydrogels Generated from Cyclic Poly(2-Oxazoline)s Display Unique Swelling and Mechanical Properties. Macromol Rapid Commun 2020; 42:e2000658. [PMID: 33326133 DOI: 10.1002/marc.202000658] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/20/2020] [Indexed: 12/14/2022]
Abstract
Cyclic macromolecules do not feature chain ends and are characterized by a higher effective intramolecular repulsion between polymer segments, leading to a higher excluded-volume effect and greater hydration with respect to their linear counterparts. As a result of these unique properties, hydrogels composed of cross-linked cyclic polymers feature enhanced mechanical strength while simultaneously incorporating more solvent with respect to networks formed from their linear analogues with identical molar mass and chemical composition. The translation of topology effects by cyclic polymers into the properties of polymer networks provides hydrogels that ideally do not include defects, such as dangling chain ends, and display unprecedented physicochemical characteristics.
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Affiliation(s)
- Lucca Trachsel
- Tissue Engineering + Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zürich, Zürich, 8093, Switzerland
| | - Matteo Romio
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, Zürich, 8093, Switzerland.,Biointerfaces, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, CH-9014 St., Gallen, Switzerland
| | - Marcy Zenobi-Wong
- Tissue Engineering + Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zürich, Zürich, 8093, Switzerland
| | - Edmondo M Benetti
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, Zürich, 8093, Switzerland.,Biointerfaces, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, CH-9014 St., Gallen, Switzerland
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7
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Hamamoto H, Takagi H, Akiba I, Yamamoto K. Analysis of Homopolymer Distribution in a Polymer Blend Thin Film by Anomalous Grazing Incidence Small-Angle X-ray Scattering at the Bromine K-Edge. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c02017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroki Hamamoto
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
| | - Hideaki Takagi
- Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - Isamu Akiba
- Department of Chemistry and Biochemistry, The University of Kitakyusyu, 1-1 Hibikino, Kitakyusyu 808-0135, Japan
| | - Katsuhiro Yamamoto
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
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8
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Rolińska K, Sikorski A. Adsorption of Linear and Cyclic Multiblock Copolymers from Selective Solvent. A Monte Carlo Study. MACROMOL THEOR SIMUL 2020. [DOI: 10.1002/mats.202000053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Karolina Rolińska
- Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 Warsaw 00‐664 Poland
- Department of Chemistry University of Warsaw Pasteura 1 Warsaw 02‐093 Poland
| | - Andrzej Sikorski
- Department of Chemistry University of Warsaw Pasteura 1 Warsaw 02‐093 Poland
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9
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Trachsel L, Romio M, Grob B, Zenobi-Wong M, Spencer ND, Ramakrishna SN, Benetti EM. Functional Nanoassemblies of Cyclic Polymers Show Amplified Responsiveness and Enhanced Protein-Binding Ability. ACS NANO 2020; 14:10054-10067. [PMID: 32628438 DOI: 10.1021/acsnano.0c03239] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The physicochemical properties of cyclic polymer adsorbates are significantly influenced by the steric and conformational constraints introduced during their cyclization. These translate into a marked difference in interfacial properties between cyclic polymers and their linear counterparts when they are grafted onto surfaces yielding nanoassemblies or polymer brushes. This difference is particularly clear in the case of cyclic polymer brushes that are designed to chemically interact with the surrounding environment, for instance, by associating with biological components present in the medium, or, alternatively, through a response to a chemical stimulus by a significant change in their properties. The intrinsic architecture characterizing cyclic poly(2-oxazoline)-based polyacid brushes leads to a broad variation in swelling and nanomechanical properties in response to pH change, in comparison with their linear analogues of identical composition and molecular weight. In addition, cyclic glycopolymer brushes derived from polyacids reveal an enhanced exposure of galactose units at the surface, due to their expanded topology, and thus display an increased lectin-binding ability with respect to their linear counterparts. This combination of amplified responsiveness and augmented protein-binding capacity renders cyclic brushes invaluable building blocks for the design of "smart" materials and functional biointerfaces.
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Affiliation(s)
- Lucca Trachsel
- Tissue Engineering + Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zürich, 8093 Zürich, Switzerland
| | - Matteo Romio
- Biointerfaces, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich; Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Benjamin Grob
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich; Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Marcy Zenobi-Wong
- Tissue Engineering + Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zürich, 8093 Zürich, Switzerland
| | - Nicholas D Spencer
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich; Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Shivaprakash N Ramakrishna
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich; Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
| | - Edmondo M Benetti
- Biointerfaces, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich; Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland
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10
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Biswas S, Yashin VV, Balazs AC. Harnessing biomimetic cryptic bonds to form self-reinforcing gels. SOFT MATTER 2020; 16:5120-5131. [PMID: 32373828 DOI: 10.1039/d0sm00145g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Cryptic sites, which lay hidden in folded biomolecules, become exposed by applied force and form new bonds that reinforce the biomaterial. While these binding interactions effectively inhibit mechanical deformation, there are few synthetic materials that harness mechano-responsive cryptic sites to forestall damage. Here, we develop a computational model to design polymer gels encompassing cryptic sites and a lower critical solution temperature (LCST). LCST gels swell with a decrease in temperature, thereby generating internal stresses within the sample. The gels also encompass loops held together by the cryptic sites, as well as dangling chains with chemically reactive ends. A decrease in temperature or an applied force causes the loops to unfold and expose the cryptic sites, which then bind to the dangling chains. We show that these binding interactions act as "struts" that reinforce the network, as indicated by a significant decrease in the volume of the gel (from 44% to 80%) and shifts in the volume phase transition temperature. Once the temperature is increased or the deformation is removed, the latter "cryptic bonds" are broken, allowing the loops to refold and the gel to return to its original state. These findings provide guidelines for designing polymer networks with reversible, mechano-responsive bonds, which allow gels to undergo a self-stiffening behavior in response to a temperature-induced internal stress or external force. When applied as a coating, these gels can prevent the underlying materials from undergoing damage and thus, extend the lifetime of the system.
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Affiliation(s)
- Santidan Biswas
- Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA.
| | - Victor V Yashin
- Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA.
| | - Anna C Balazs
- Chemical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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11
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Ramakrishna SN, Morgese G, Zenobi-Wong M, Benetti EM. Comblike Polymers with Topologically Different Side Chains for Surface Modification: Assembly Process and Interfacial Physicochemical Properties. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02549] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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12
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Divandari M, Morgese G, Ramakrishna SN, Benetti EM. Surface-grafted assemblies of cyclic polymers: Shifting between high friction and extreme lubricity. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.11.039] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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13
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Divandari M, Trachsel L, Yan W, Rosenboom JG, Spencer ND, Zenobi-Wong M, Morgese G, Ramakrishna SN, Benetti EM. Surface Density Variation within Cyclic Polymer Brushes Reveals Topology Effects on Their Nanotribological and Biopassive Properties. ACS Macro Lett 2018; 7:1455-1460. [PMID: 35651229 DOI: 10.1021/acsmacrolett.8b00847] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
While topology effects by cyclic polymers in solution and melts are well-known, their translation into the interfacial properties of polymer "brushes" provides new opportunities to impart enhanced surface lubricity and biopassivity to inorganic surfaces, above and beyond that expected for linear analogues of identical composition. The impact of polymer topology on the nanotribological and protein-resistance properties of polymer brushes is revealed by studying linear and cyclic poly(2-ethyl-2-oxazoline) (PEOXA) grafts presenting a broad range of surface densities and while shearing them alternatively against an identical brush or a bare inorganic surface. The intramolecular constraints introduced by the cyclization provide a valuable increment in both steric stabilization and load-bearing capacity for cyclic brushes. Moreover, the intrinsic absence of chain ends within cyclic adsorbates hinders interpenetration between opposing brushes, as they are slid over each other, leading to a reduction in the friction coefficient (μ) at higher pressures, a phenomenon not observed for linear grafts. The application of cyclic polymers for the modification of inorganic surfaces generates films that outperform both the nanotribological and biopassive properties of linear brushes, significantly expanding the design possibilities for synthetic biointerfaces.
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Affiliation(s)
- Mohammad Divandari
- Polymer Surfaces Group, Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Zürich, Switzerland
| | - Lucca Trachsel
- Polymer Surfaces Group, Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Zürich, Switzerland
- Tissue Engineering and Biofabrication, Department of Health Sciences and Technology, ETH Zürich, Zürich, Switzerland
| | - Wenqing Yan
- Polymer Surfaces Group, Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Zürich, Switzerland
| | - Jan-Georg Rosenboom
- Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland
| | - Nicholas D. Spencer
- Polymer Surfaces Group, Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Zürich, Switzerland
| | - Marcy Zenobi-Wong
- Tissue Engineering and Biofabrication, Department of Health Sciences and Technology, ETH Zürich, Zürich, Switzerland
| | - Giulia Morgese
- Institute for Complex Molecular Systems, Technical University of Eindhoven (TU/e), Eindhoven, The Netherlands
| | - Shivaprakash N. Ramakrishna
- Polymer Surfaces Group, Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Zürich, Switzerland
| | - Edmondo M. Benetti
- Polymer Surfaces Group, Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, Zürich, Switzerland
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14
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Zhou X, Liu L, Chen J, Zhang L. Unusual conformations of semiflexible ring polymers confined in two parallel surfaces. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.10.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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15
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Guo Y, Song R, Feng R, Dai G, Liang Y, Pu D, Zhang X, Ye Z. Thermoresponsive behavior of graft copolymers based on poly(N,N-dimethylacrylamide-co-diacetoneacrylamide) side chains. J Appl Polym Sci 2018. [DOI: 10.1002/app.47051] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yongjun Guo
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu People's Republic of China
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Rutong Song
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
| | - Rusen Feng
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu People's Republic of China
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
| | - Gang Dai
- China Resources Xinglu Gas Co.; Luzhou People's Republic of China
| | - Yan Liang
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Di Pu
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Xinmin Zhang
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
- Sichuan Guangya Polymer Chemical Co.; Chengdu People's Republic of China
| | - Zhongbin Ye
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation; Southwest Petroleum University; Chengdu People's Republic of China
- School of Chemistry and Chemical Engineering; Southwest Petroleum University; Chengdu People's Republic of China
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16
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Kchaou M, Alcouffe P, Chandran S, Cassagnau P, Reiter G, Al Akhrass S. Tuning relaxation dynamics and mechanical properties of polymer films of identical thickness. Phys Rev E 2018; 97:032507. [PMID: 29776131 DOI: 10.1103/physreve.97.032507] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Indexed: 11/07/2022]
Abstract
Using dewetting as a characterization tool, we demonstrate that physical properties of thin polymer films can be regulated and tuned by employing variable processing conditions. For different molecular weights, the variable behavior of polystyrene films of identical thickness, prepared along systematically altered pathways, became predictable through a single parameter P, defined as the ratio of time required over time available for the equilibration of polymers. In particular, preparation-induced residual stresses, the corresponding relaxation times as well as the rupture probability of such films (of identical thickness) varied by orders of magnitude following scaling relations with P. Our experimental findings suggest that we can predictably enhance properties and hence maximize the performance of thin polymer films via appropriately chosen processing conditions.
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Affiliation(s)
- Marwa Kchaou
- Université Claude Bernard Lyon 1, Ingénierie des Matériaux Polymères (IMP - UMR CNRS 5223), 15 Boulevard Latarjet, 69622 Villeurbanne Cedex, France
| | - Pierre Alcouffe
- Université Claude Bernard Lyon 1, Ingénierie des Matériaux Polymères (IMP - UMR CNRS 5223), 15 Boulevard Latarjet, 69622 Villeurbanne Cedex, France
| | | | - Philippe Cassagnau
- Université Claude Bernard Lyon 1, Ingénierie des Matériaux Polymères (IMP - UMR CNRS 5223), 15 Boulevard Latarjet, 69622 Villeurbanne Cedex, France
| | - Günter Reiter
- Institute of Physics, University of Freiburg, 79104 Freiburg, Germany.,Freiburg Materials Research Center, University of Freiburg, 79104 Freiburg, Germany
| | - Samer Al Akhrass
- Université Claude Bernard Lyon 1, Ingénierie des Matériaux Polymères (IMP - UMR CNRS 5223), 15 Boulevard Latarjet, 69622 Villeurbanne Cedex, France
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17
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Gnan N, Rovigatti L, Bergman M, Zaccarelli E. In Silico Synthesis of Microgel Particles. Macromolecules 2017; 50:8777-8786. [PMID: 29151620 PMCID: PMC5688413 DOI: 10.1021/acs.macromol.7b01600] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 09/20/2017] [Indexed: 01/26/2023]
Abstract
Microgels are colloidal-scale particles individually made of cross-linked polymer networks that can swell and deswell in response to external stimuli, such as changes to temperature or pH. Despite a large amount of experimental activities on microgels, a proper theoretical description based on individual particle properties is still missing due to the complexity of the particles. To go one step further, here we propose a novel methodology to assemble realistic microgel particles in silico. We exploit the self-assembly of a binary mixture composed of tetravalent (cross-linkers) and bivalent (monomer beads) patchy particles under spherical confinement in order to produce fully bonded networks. The resulting structure is then used to generate the initial microgel configuration, which is subsequently simulated with a bead-spring model complemented by a temperature-induced hydrophobic attraction. To validate our assembly protocol, we focus on a small microgel test case and show that we can reproduce the experimental swelling curve by appropriately tuning the confining sphere radius, something that would not be possible with less sophisticated assembly methodologies, e.g., in the case of networks generated from an underlying crystal structure. We further investigate the structure (in reciprocal and real space) and the swelling curves of microgels as a function of temperature, finding that our results are well described by the widely used fuzzy sphere model. This is a first step toward a realistic modeling of microgel particles, which will pave the way for a careful assessment of their elastic properties and effective interactions.
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Affiliation(s)
- Nicoletta Gnan
- CNR-ISC, Uos Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
- Dipartimento
di Fisica, Sapienza Università di
Roma, Piazzale A. Moro
2, 00185 Roma, Italy
| | - Lorenzo Rovigatti
- CNR-ISC, Uos Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
- Dipartimento
di Fisica, Sapienza Università di
Roma, Piazzale A. Moro
2, 00185 Roma, Italy
| | - Maxime Bergman
- Physical
Chemistry, Department of Chemistry, Lund
University, Lund, Sweden
| | - Emanuela Zaccarelli
- CNR-ISC, Uos Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
- Dipartimento
di Fisica, Sapienza Università di
Roma, Piazzale A. Moro
2, 00185 Roma, Italy
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18
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Satarifard V, Heidari M, Mashaghi S, Tans SJ, Ejtehadi MR, Mashaghi A. Topology of polymer chains under nanoscale confinement. NANOSCALE 2017; 9:12170-12177. [PMID: 28805849 DOI: 10.1039/c7nr04220e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Spatial confinement limits the conformational space accessible to biomolecules but the implications for bimolecular topology are not yet known. Folded linear biopolymers can be seen as molecular circuits formed by intramolecular contacts. The pairwise arrangement of intra-chain contacts can be categorized as parallel, series or cross, and has been identified as a topological property. Using molecular dynamics simulations, we determine the contact order distributions and topological circuits of short semi-flexible linear and ring polymer chains with a persistence length of lp under a spherical confinement of radius Rc. At low values of lp/Rc, the entropy of the linear chain leads to the formation of independent contacts along the chain and accordingly, increases the fraction of series topology with respect to other topologies. However, at high lp/Rc, the fraction of cross and parallel topologies are enhanced in the chain topological circuits with cross becoming predominant. At an intermediate confining regime, we identify a critical value of lp/Rc, at which all topological states have equal probability. Confinement thus equalizes the probability of more complex cross and parallel topologies to the level of the more simple, non-cooperative series topology. Moreover, our topology analysis reveals distinct behaviours for ring- and linear polymers under weak confinement; however, we find no difference between ring- and linear polymers under strong confinement. Under weak confinement, ring polymers adopt parallel and series topologies with equal likelihood, while linear polymers show a higher tendency for series arrangement. The radial distribution analysis of the topology reveals a non-uniform effect of confinement on the topology of polymer chains, thereby imposing more pronounced effects on the core region than on the confinement surface. Additionally, our results reveal that over a wide range of confining radii, loops arranged in parallel and cross topologies have nearly the same contact orders. Such degeneracy implies that the kinetics and transition rates between the topological states cannot be solely explained by contact order. We expect these findings to be of general importance in understanding chaperone assisted protein folding, chromosome architecture, and the evolution of molecular folds.
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Affiliation(s)
- Vahid Satarifard
- Leiden Academic Centre for Drug Research, Faculty of Mathematics and Natural Sciences, Leiden University, Leiden, The Netherlands.
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19
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Wang R, Di ZY, Müller-Buschbaum P, Frielinghaus H. Effect of PCBM additive on morphology and optoelectronic properties of P3HT-b-PS films. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.06.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Zhang L, Elupula R, Grayson SM, Torkelson JM. Suppression of the Fragility-Confinement Effect via Low Molecular Weight Cyclic or Ring Polymer Topology. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02280] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | - Ravinder Elupula
- Department
of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States
| | - Scott M. Grayson
- Department
of Chemistry, Tulane University, New Orleans, Louisiana 70118, United States
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21
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Chen S, Wang K, Zhang W. A new thermoresponsive polymer of poly(N-acryloylsarcosine methyl ester) with a tunable LCST. Polym Chem 2017. [DOI: 10.1039/c7py00274b] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A thermoresponsive polymer of the tertiary amide-based polyacrylamide, PNASME, was synthesized and its tunable thermoresponse was investigated.
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Affiliation(s)
- Shengli Chen
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Ke Wang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Wangqing Zhang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
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22
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Ye S, Tang Q, Yang J, Zhang K, Zhao J. Interfacial diffusion of a single cyclic polymer chain. SOFT MATTER 2016; 12:9520-9526. [PMID: 27853804 DOI: 10.1039/c6sm02103d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Lateral diffusion of cyclic polystyrene at the interface between fused silica and dichloromethane is investigated at the single-molecular level. Narrowly distributed cyclic polystyrene (c-PS) of high purity with molecular weights spanning nearly an order of magnitude is prepared via atom transfer radical polymerization (ATRP) and Cu-catalyzed azide/alkyne cycloaddition (CuAAC) click reaction. The diffusion coefficients (D) of c-PS and its linear analogue (l-PS) on the surface are measured by fluorescence correlation spectroscopy (FCS). The diffusion coefficient of c-PS is discovered to have an inverse dependence on molecular weight, D ∼ M-1, in contrast to the case of linear polystyrene, which reproduces a stronger molecular weight dependence, D ∼ M-3/2. The slower interfacial motion of cyclic chains is attributed to their stronger binding to the surface and more importantly, the unique surface diffusion mechanism due to the absence of free chain ends.
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Affiliation(s)
- Shaoyong Ye
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qingquan Tang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingfa Yang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ke Zhang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiang Zhao
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China
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23
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Kelich P, Asadinezhad A. Adsorption of poly(ethylene succinate) chain onto graphene nanosheets: A molecular simulation. J Mol Graph Model 2016; 69:26-38. [PMID: 27560653 DOI: 10.1016/j.jmgm.2016.08.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Revised: 07/30/2016] [Accepted: 08/08/2016] [Indexed: 11/26/2022]
Abstract
Understanding the interaction between single polymer chain and graphene nanosheets at local and global length scales is essential for it underlies the mesoscopic properties of polymer nanocomposites. A computational attempt was then performed using atomistic molecular dynamics simulation to gain physical insights into behavior of a model aliphatic polyester, poly(ethylene succinate), single chain near graphene nanosheets, where the effects of the polymer chain length, graphene functionalization, and temperature on conformational properties of the polymer were studied comparatively. Graphene functionalization was carried out through extending the parameters set of an all-atom force field. The results showed a significant conformational transition of the polymer chain from three-dimensional statistical coil, in initial state, to two-dimensional fold, in final state, during adsorption on graphene. The conformational order, overall shape, end-to-end separation statistics, and mobility of the polymer chain were found to be influenced by the graphene functionalization, temperature, and polymer chain length. Furthermore, the polymer chain dynamics mode during adsorption on graphene was observed to transit from normal diffusive to slow subdiffusive mode. The findings from this computational study could shed light on the physics of the early stages of aliphatic polyester chain organization induced by graphene.
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Affiliation(s)
- Payam Kelich
- Department of Chemical Engineering, Isfahan University of Technology, 84156-83111 Esfahan, Iran
| | - Ahmad Asadinezhad
- Department of Chemical Engineering, Isfahan University of Technology, 84156-83111 Esfahan, Iran.
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24
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Glagoleva AA, Vasilevskaya VV, Khokhlov AR. Polymer globule with fractal properties caused by intramolecular nanostructuring and spatial constrains. SOFT MATTER 2016; 12:5138-5145. [PMID: 27198966 DOI: 10.1039/c6sm00747c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
By means of computer simulation, we studied macromolecules composed of N dumbbell amphiphilic monomer units with attractive pendant groups. In poor solvents, these macromolecules form spherical globules that are dense in the case of short chains (the gyration radius RG∼N(1/3)), or hollow inside and obey the RG∼N(1/2) law when the macromolecules are sufficiently long. Due to the specific intramolecular nanostructuring, the vesicle-like globules of long amphiphilic macromolecules posses some properties of fractal globules, by which they (i) could demonstrate the same scaling statistics for the entire macromolecule and for short subchains with m monomer units and (ii) possess a specific territorial structure. Within a narrow slit, the globule loses its inner cavity, takes a disk-like shape and scales as N(1/2) for much shorter macromolecules. However, the field of end-to-end distance r(m) ∼m(1/2) dependence for subchains becomes visibly smaller. The results obtained were compared with the homopolymer case.
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Affiliation(s)
- Anna A Glagoleva
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia.
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