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Popov I, Carroll B, Bocharova V, Genix AC, Cheng S, Khamzin A, Kisliuk A, Sokolov AP. Strong Reduction in Amplitude of the Interfacial Segmental Dynamics in Polymer Nanocomposites. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00496] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Ivan Popov
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby Carroll
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Vera Bocharova
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Anne-Caroline Genix
- Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier F-34095, France
| | - Shiwang Cheng
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lancing, Michigan 48824, United States
| | - Airat Khamzin
- Institute of Physics, Kazan Federal University, Kremlevskaya Str. 18, Kazan, Tatarstan 420008, Russia
| | - Alexander Kisliuk
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, 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
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Androulaki K, Chrissopoulou K, Prevosto D, Labardi M, Anastasiadis SH. Dynamics of Hyperbranched Polymers under Confinement: A Dielectric Relaxation Study. ACS APPLIED MATERIALS & INTERFACES 2015; 7:12387-12398. [PMID: 25603491 DOI: 10.1021/am507571y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The effect of severe confinement on the dynamics of three different generations of hyperbranched polyesters of the Boltorn family is investigated by dielectric relaxation spectroscopy (DRS). The polymer chains are intercalated within the galleries of natural montmorillonite (Na+-MMT), thus forming 1 nm polymer films confined between solid walls. The structure of the nanocomposites is studied with X-ray diffraction and the thermal behavior of the polymers in bulk and under confinement is determined by differential scanning calorimetry. The glass transition temperatures of the polymers show a clear dependence on the generation whereas the transition is completely suppressed when all the polymer chains are intercalated. The dynamic investigation of the bulk polymers reveals two sub-Tg processes, with similar behavior for the three polymers with the segmental relaxation observed above the Tg of each polymer. For the nanocomposites, where all the polymer chains are severely confined, the dynamics show significant differences compared to that of the bulk polymers. The sub-Tg processes are similar for the three generations but significantly faster and with weaker temperature dependence than those in the bulk. The segmental process appears at temperatures below the bulk polymer Tg, it exhibits an Arrhenius temperature dependence and shows differences for the three generations. A slow process that appears at higher temperatures is due to interfacial polarization.
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Affiliation(s)
- Krystalenia Androulaki
- †Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 711 10 Heraklion Crete, Greece
- ‡Department of Chemistry, University of Crete, 710 03 Heraklion Crete, Greece
| | - Kiriaki Chrissopoulou
- †Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 711 10 Heraklion Crete, Greece
| | - Daniele Prevosto
- §CNR-IPCF, Department of Physics, University of Pisa, Pisa, Italy
| | | | - Spiros H Anastasiadis
- †Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, 711 10 Heraklion Crete, Greece
- ‡Department of Chemistry, University of Crete, 710 03 Heraklion Crete, Greece
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Niss K, Gundermann D, Christensen T, Dyre JC. Dynamic thermal expansivity of liquids near the glass transition. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:041501. [PMID: 22680477 DOI: 10.1103/physreve.85.041501] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Indexed: 06/01/2023]
Abstract
Based on previous works on polymers by Bauer et al. [Phys. Rev. E 61, 1755 (2000)], this paper describes a capacitative method for measuring the dynamical expansion coefficient of a viscous liquid. Data are presented for the glass-forming liquid tetramethyl tetraphenyl trisiloxane (DC704) in the ultraviscous regime. Compared to the method of Bauer et al., the dynamical range has been extended by making time-domain experiments and by making very small and fast temperature steps. The modeling of the experiment presented in this paper includes the situation in which the capacitor is not full because the liquid contracts when cooling from room temperature down to around the glass-transition temperature, which is relevant when measuring on a molecular liquid rather than a polymer.
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Affiliation(s)
- Kristine Niss
- DNRF Centre Glass and Time, IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
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Paeng K, Lee HN, Swallen SF, Ediger MD. Temperature-ramping measurement of dye reorientation to probe molecular motion in polymer glasses. J Chem Phys 2011; 134:024901. [DOI: 10.1063/1.3507255] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Keewook Paeng
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Hau-Nan Lee
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Stephen F. Swallen
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - M. D. Ediger
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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Erber M, Georgi U, Müller J, Eichhorn KJ, Voit B. Polystyrene with different topologies: Study of the glass transition temperature in confined geometry of thin films. Eur Polym J 2010. [DOI: 10.1016/j.eurpolymj.2010.09.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Serghei A, Tress M, Kremer F. The glass transition of thin polymer films in relation to the interfacial dynamics. J Chem Phys 2010; 131:154904. [PMID: 20568881 DOI: 10.1063/1.3248368] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
As opposed to measurements on the glass transition of a polymer in the bulk, measurements of thin polymer layers reflect--due to the alterations of the glassy dynamics at the confining interfaces--several contributions acting together to give the net response of a polymer film. This fundamental difference is exemplified in detail for the particular case of broadband dielectric spectroscopy, an experimental tool extensively employed to investigate the glassy dynamics of polymers under condition of geometrical confinement.
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Affiliation(s)
- A Serghei
- Institute for Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany.
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7
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Variations in the glass transition temperature of polyester with special architectures confined in thin films. POLYMER 2010. [DOI: 10.1016/j.polymer.2009.11.032] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Turky G, Shaaban SS, Schöenhals A. Broadband dielectric spectroscopy on the molecular dynamics in different generations of hyperbranched polyester. J Appl Polym Sci 2009. [DOI: 10.1002/app.30046] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Sangoro JR, Turky G, Abdel Rehim M, Iacob C, Naumov S, Ghoneim A, Kärger J, Kremer F. Charge Transport and Dipolar Relaxations in Hyperbranched Polyamide Amines. Macromolecules 2009. [DOI: 10.1021/ma8024046] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. R. Sangoro
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
| | - G. Turky
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
| | - M. Abdel Rehim
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
| | - C. Iacob
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
| | - S. Naumov
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
| | - A. Ghoneim
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
| | - J. Kärger
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
| | - F. Kremer
- Institute of Experimental Physics I, University of Leipzig, Leipzig, Germany; Microwave Physics and Dielectrics Department, NRC, Cairo, Egypt; and Packing and Packaging Department, NRC, Cairo, Egypt
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Kim S, Roth CB, Torkelson JM. Effect of nanoscale confinement on the glass transition temperature of free-standing polymer films: Novel, self-referencing fluorescence method. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/polb.21591] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Serghei A, Huth H, Schick C, Kremer F. Glassy Dynamics in Thin Polymer Layers Having a Free Upper Interface. Macromolecules 2008. [DOI: 10.1021/ma702381t] [Citation(s) in RCA: 137] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Serghei
- Institute for Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany, and Physics Department, University of Rostock, 18051 Rostock, Germany
| | - H. Huth
- Institute for Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany, and Physics Department, University of Rostock, 18051 Rostock, Germany
| | - C. Schick
- Institute for Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany, and Physics Department, University of Rostock, 18051 Rostock, Germany
| | - F. Kremer
- Institute for Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany, and Physics Department, University of Rostock, 18051 Rostock, Germany
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Efremov MY, Soofi SS, Kiyanova AV, Munoz CJ, Burgardt P, Cerrina F, Nealey PF. Vacuum ellipsometry as a method for probing glass transition in thin polymer films. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:043903. [PMID: 18447531 DOI: 10.1063/1.2901601] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A vacuum ellipsometer has been designed for probing the glass transition in thin supported polymer films. The device is based on the optics of a commercial spectroscopic phase-modulated ellipsometer. A custom-made vacuum chamber evacuated by oil-free pumps, variable temperature optical table, and computer-based data acquisition system was described. The performance of the tool has been demonstrated using 20-200 nm thick poly(methyl methacrylate) and polystyrene films coated on silicon substrates at 10(-6)-10(-8) torr residual gas pressure. Both polymers show pronounced glass transitions. The difficulties in assigning in the glass transition temperature are discussed with respect to the experimental challenges of the measurements in thin polymer films. It is found that the experimental curves can be significantly affected by a residual gas. This effect manifests itself at lower temperatures as a decreased or even negative apparent thermal coefficient of expansion, and is related to the uptake and desorption of water by the samples during temperature scans. It is also found that an ionization gauge--the standard accessory of any high vacuum system--can cause a number of spurious phenomena including drift in the experimental data, roughening of the polymer surface, and film dewetting.
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Affiliation(s)
- Mikhail Yu Efremov
- Department of Chemical and Biological Engineering and Center for Nanotechnology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
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Oh H, Green PF. Role of Diblock Copolymers toward Controlling the Glass Transition of Thin Polymer Films. Macromolecules 2008. [DOI: 10.1021/ma071805v] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyunjoon Oh
- Department of Materials Science and Engineering and Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109
| | - Peter F. Green
- Department of Materials Science and Engineering and Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109
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Serghei A, Kremer F. Broadband dielectric studies on the interfacial dynamics enabled by use of nanostructured electrodes. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2008; 79:026101. [PMID: 18315333 DOI: 10.1063/1.2839021] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
By employing silica nanostructures as spacers, an experimental approach is developed to enable one broadband dielectric measurements on the molecular dynamics taking place in the immediate (nanometric) vicinity of solid interfaces. This development renders to broadband dielectric spectroscopy--traditionally a bulk technique--the character of an interfacial method.
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Affiliation(s)
- A Serghei
- Institute for Experimental Physics I, University of Leipzig, 04103 Leipzig, Germany
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Elrehim MA, Said S, Ghoneim A, Turky G. Dielectric Properties of Hyperbranched Polyesteramide with Long Alkyl Chain End Groups. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/masy.200750801] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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