Molecular Theory of Physical Aging in Polymer Glasses

by: Kang Chen, Kenneth S Schweizer

Physical Review Letters, Vol. 98, No. 16. (2007)

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Abstract

A molecular level theory for the physical aging of polymer glasses is proposed. The nonequilibrium time evolution of the amplitude of long wavelength density fluctuations, and its influence on activated barrier hopping, plays an essential role. The theory predicts temperature-dependent apparent power-law aging of the segmental relaxation time and logarithmic aging of thermodynamiclike properties, in good accord with experiments. A physical origin for the quantitative nonuniversal aspects based on the amplitude of quenched density fluctuations is suggested.

@article{citeulike:2553163, abstract = {A molecular level theory for the physical aging of polymer glasses is proposed. The nonequilibrium time evolution of the amplitude of long wavelength density fluctuations, and its influence on activated barrier hopping, plays an essential role. The theory predicts temperature-dependent apparent power-law aging of the segmental relaxation time and logarithmic aging of thermodynamiclike properties, in good accord with experiments. A physical origin for the quantitative nonuniversal aspects based on the amplitude of quenched density fluctuations is suggested.}, author = {Chen, Kang and Schweizer, Kenneth S. }, citeulike-article-id = {2553163}, doi = {10.1103/PhysRevLett.98.167802}, journal = {Physical Review Letters}, keywords = {2007, glass, people, polymer, theory}, number = {16}, posted-at = {2008-03-18 23:13:22}, priority = {2}, publisher = {APS}, title = {Molecular Theory of Physical Aging in Polymer Glasses}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000098000016167802000001\&idtype=cvips\&gifs=yes}, volume = {98}, year = {2007} }

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TY - JOUR ID - citeulike:2553163 L3 - citeulike-article-id:2553163 TI - Molecular Theory of Physical Aging in Polymer Glasses JF - Physical Review Letters VL - 98 IS - 16 PB - APS N2 - A molecular level theory for the physical aging of polymer glasses is proposed. The nonequilibrium time evolution of the amplitude of long wavelength density fluctuations, and its influence on activated barrier hopping, plays an essential role. The theory predicts temperature-dependent apparent power-law aging of the segmental relaxation time and logarithmic aging of thermodynamiclike properties, in good accord with experiments. A physical origin for the quantitative nonuniversal aspects based on the amplitude of quenched density fluctuations is suggested. KW - 2007 KW - glass KW - people KW - polymer KW - theory AU - Chen, Kang AU - Schweizer, Kenneth PY - 2007/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000098000016167802000001&idtype=cvips&gifs=yes ER -

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