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Bulacu M, van der Giessen E. Molecular-dynamics simulation study of the glass transition in amorphous polymers with controlled chain stiffness. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 76:011807. [PMID: 17677484 DOI: 10.1103/physreve.76.011807] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2006] [Revised: 04/19/2007] [Indexed: 05/16/2023]
Abstract
We report computation results obtained from extensive coarse-grained molecular-dynamics simulations of amorphous ensembles of polymer chains at constant density. In our polymer model, we use bending and torsion potentials acting along the polymer backbone to control the chain stiffness. The static and dynamic properties of the polymer bulk have been analyzed over a large temperature interval in search for the onset of the glass transition. The glass transition temperatures Tg, for different types of chain stiffness, have been determined from the dependence of the self-diffusion coefficient D on the temperature T as the limiting value where the diffusion vanishes. Increasing the chain stiffness induces an increase of the glass transition temperature. The Tg values estimated from diffusion are confirmed by analyzing the relaxation times of the autocorrelation functions for the torsion angle and for the end-to-end vector. The dependence of the diffusion coefficient D on the chain length N is strongly affected by temperature for chains with bending and torsion stiffness. For systems with relatively short chains (N<or=50), the exponent nu from D proportional to N(-nu) increases from the value nu approximately 1 expected in the Rouse regime to nu approximately 2 as the temperature is lowered towards Tg.
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Affiliation(s)
- Monica Bulacu
- Zernike Institute for Advances Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Tsolou G, Mavrantzas VG, Theodorou DN. Detailed Atomistic Molecular Dynamics Simulation of cis-1,4-Poly(butadiene). Macromolecules 2005. [DOI: 10.1021/ma0491210] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Georgia Tsolou
- Institute of Chemical Engineering and High-Temperature Chemical Processes (FORTH-ICE/HT), Patras GR 26504, Greece, Department of Chemical Engineering, University of Patras, Patras GR 26504, Greece, Interdepartmental EPEAEK Program on Polymer Science and Technology, University of Patras, Patras GR 26504, Greece, and Department of Materials Science and Engineering, School of Chemical Engineering, National Technical University of Athens, 157 80 Athens, Greece
| | - Vlasis G. Mavrantzas
- Institute of Chemical Engineering and High-Temperature Chemical Processes (FORTH-ICE/HT), Patras GR 26504, Greece, Department of Chemical Engineering, University of Patras, Patras GR 26504, Greece, Interdepartmental EPEAEK Program on Polymer Science and Technology, University of Patras, Patras GR 26504, Greece, and Department of Materials Science and Engineering, School of Chemical Engineering, National Technical University of Athens, 157 80 Athens, Greece
| | - Doros N. Theodorou
- Institute of Chemical Engineering and High-Temperature Chemical Processes (FORTH-ICE/HT), Patras GR 26504, Greece, Department of Chemical Engineering, University of Patras, Patras GR 26504, Greece, Interdepartmental EPEAEK Program on Polymer Science and Technology, University of Patras, Patras GR 26504, Greece, and Department of Materials Science and Engineering, School of Chemical Engineering, National Technical University of Athens, 157 80 Athens, Greece
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Harmandaris VA, Mavrantzas VG, Theodorou DN, Kröger M, Ramírez J, Öttinger HC, Vlassopoulos D. Crossover from the Rouse to the Entangled Polymer Melt Regime: Signals from Long, Detailed Atomistic Molecular Dynamics Simulations, Supported by Rheological Experiments. Macromolecules 2003. [DOI: 10.1021/ma020009g] [Citation(s) in RCA: 178] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. A. Harmandaris
- Institute of Chemical Engineering and High-Temperature Chemical Processes, (ICE/HT-FORTH), GR 26500, Patras, Greece, Department of Chemical Engineering, University of Patras, GR 26500 Patras, Greece, Department of Materials, Institute of Polymers, ETH Zürich, CH-8092 Zürich, Switzerland, Swiss Rheocenter, CH-8092 Zürich, Switzerland, Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany, and Institute of Electronic Structure and Laser (IESL-FORTH), P.O. Box 1527,
| | - V. G. Mavrantzas
- Institute of Chemical Engineering and High-Temperature Chemical Processes, (ICE/HT-FORTH), GR 26500, Patras, Greece, Department of Chemical Engineering, University of Patras, GR 26500 Patras, Greece, Department of Materials, Institute of Polymers, ETH Zürich, CH-8092 Zürich, Switzerland, Swiss Rheocenter, CH-8092 Zürich, Switzerland, Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany, and Institute of Electronic Structure and Laser (IESL-FORTH), P.O. Box 1527,
| | - D. N. Theodorou
- Institute of Chemical Engineering and High-Temperature Chemical Processes, (ICE/HT-FORTH), GR 26500, Patras, Greece, Department of Chemical Engineering, University of Patras, GR 26500 Patras, Greece, Department of Materials, Institute of Polymers, ETH Zürich, CH-8092 Zürich, Switzerland, Swiss Rheocenter, CH-8092 Zürich, Switzerland, Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany, and Institute of Electronic Structure and Laser (IESL-FORTH), P.O. Box 1527,
| | - M. Kröger
- Institute of Chemical Engineering and High-Temperature Chemical Processes, (ICE/HT-FORTH), GR 26500, Patras, Greece, Department of Chemical Engineering, University of Patras, GR 26500 Patras, Greece, Department of Materials, Institute of Polymers, ETH Zürich, CH-8092 Zürich, Switzerland, Swiss Rheocenter, CH-8092 Zürich, Switzerland, Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany, and Institute of Electronic Structure and Laser (IESL-FORTH), P.O. Box 1527,
| | - J. Ramírez
- Institute of Chemical Engineering and High-Temperature Chemical Processes, (ICE/HT-FORTH), GR 26500, Patras, Greece, Department of Chemical Engineering, University of Patras, GR 26500 Patras, Greece, Department of Materials, Institute of Polymers, ETH Zürich, CH-8092 Zürich, Switzerland, Swiss Rheocenter, CH-8092 Zürich, Switzerland, Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany, and Institute of Electronic Structure and Laser (IESL-FORTH), P.O. Box 1527,
| | - H. C. Öttinger
- Institute of Chemical Engineering and High-Temperature Chemical Processes, (ICE/HT-FORTH), GR 26500, Patras, Greece, Department of Chemical Engineering, University of Patras, GR 26500 Patras, Greece, Department of Materials, Institute of Polymers, ETH Zürich, CH-8092 Zürich, Switzerland, Swiss Rheocenter, CH-8092 Zürich, Switzerland, Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany, and Institute of Electronic Structure and Laser (IESL-FORTH), P.O. Box 1527,
| | - D. Vlassopoulos
- Institute of Chemical Engineering and High-Temperature Chemical Processes, (ICE/HT-FORTH), GR 26500, Patras, Greece, Department of Chemical Engineering, University of Patras, GR 26500 Patras, Greece, Department of Materials, Institute of Polymers, ETH Zürich, CH-8092 Zürich, Switzerland, Swiss Rheocenter, CH-8092 Zürich, Switzerland, Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin, Germany, and Institute of Electronic Structure and Laser (IESL-FORTH), P.O. Box 1527,
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