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- W2000880079 abstract "The nonlinear Langevin equation theory of segmental relaxation, elasticity, and mechanical response of polymer glasses is extended to describe the coupled effects of physical aging, mechanical rejuvenation, and thermal history. The key structural variable is the amplitude of density fluctuations, and segmental dynamics proceeds via stress-modified activated barrier hopping on a dynamic free-energy profile. Mechanically generated disorder (rejuvenation) is quantified by a dissipative work argument and increases the amplitude of density fluctuations, thereby speeding up relaxation beyond that induced by the landscape tilting mechanism. The theory makes testable predictions for the time evolution and nonequilibrium steady state of the alpha relaxation time, density fluctuation amplitude, elastic modulus, and other properties. Model calculations reveal a rich dependence of these quantities on preaging time, applied stress, and temperature that reflects the highly nonlinear competition between physical aging and mechanical disordering. Thermal history is ``erased'' in the long-time limit, although the nonequilibrium steady state is not the literal ``fully rejuvenated'' freshly quenched glass. The present work provides the conceptual foundation for a quantitative treatment of the nonlinear mechanical response of polymer glasses under a variety of deformation protocols." @default.
- W2000880079 created "2016-06-24" @default.
- W2000880079 creator A5024887366 @default.
- W2000880079 creator A5045572539 @default.
- W2000880079 date "2010-10-20" @default.
- W2000880079 modified "2023-09-28" @default.
- W2000880079 title "Theory of aging, rejuvenation, and the nonequilibrium steady state in deformed polymer glasses" @default.
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- W2000880079 doi "https://doi.org/10.1103/physreve.82.041804" @default.
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