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- W2107627320 abstract "Abstract Summary: In order to have better insight into the polymer specifics of the dynamic glass transition molecular dynamics (MD) computer simulations of three glass‐formers have been carried out: low‐molecular‐weight isopropylbenzene (iPB), brittle atactic polystyrene (PS) and tough bisphenol A polycarbonate (PC). Simulation of the uniaxial deformation of these mechanically different types of amorphous polymers shows that the mechanical experimental data could be realistically reproduced. Now the objective is to study the local orientational mobility in the non‐deformed isotropic state and to find the possible connection of the segmental dynamics with the different bulk mechanical properties. Local orientational mobility has been studied via Legendre polynomials of the second order and CONTIN analysis. Insight into local orientational dynamics on a range of length‐ and time scales is acquired. The fast transient ballistic process describing the very initial part of the relaxation has been observed for all temperatures. For all three simulated materials the slowing down of cage escape (α‐relaxation) follows mode‐coupling theory above T g , with non‐universal, material‐specific exponents. Below T g universal activated segmental motion has been found. At high temperature the α process is merged with the β process. The β process which corresponds to the motions within cage continues below T g and can be described by an activation law." @default.
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- W2107627320 date "2006-03-01" @default.
- W2107627320 modified "2023-10-11" @default.
- W2107627320 title "Atomistic Simulation of Bulk Mechanics and Local Dynamics of Amorphous Polymers" @default.
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- W2107627320 doi "https://doi.org/10.1002/masy.200650512" @default.
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