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- W2170498187 abstract "The full-chain dynamics and the linear viscoelastic properties of monodisperse, entangled linear and star polymers are simulated consistently via an equilibrium stochastic algorithm, based on a recently proposed full-chain reptation theory1 that is able to treat self-consistently mechanisms of chain reptation, chain-length fluctuations, and constraint release. In particular, it is the first time that the full-chain simulation for star polymers is performed without subjecting to the great simplifications usually made. To facilitate the study on linear viscoelasticity, we employ a constraint release mechanism that resembles the idea of tube dilation, in contrast to the one used earlier in simulating flows, where constraint release was performed in a fashion similar to double reptation. Predictions of the simulation are compared qualitatively and quantitatively with experiments, and excellent agreement is found for all investigated properties, which include the scaling laws for the zero-shear-rate viscosity and the steady-state compliance as well as the stress relaxation and dynamic moduli, for both polymer systems. The simulation for linear polymers indicates that the full-chain reptation theory considered is able to predict very well the rheology of monodisperse linear polymers under both linear viscoelastic and flow conditions. The simulation for star polymers, on the other hand, strongly implies that double reptation alone is insufficient, and other unexplored mechanisms that may further enhance stress relaxation of the tube segments near the star center seem crucial, in explaining the linear viscoelasticity of star polymers. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 248–261, 2000" @default.
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- W2170498187 date "2000-01-01" @default.
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- W2170498187 title "Full-chain dynamics of entangled linear and star polymers" @default.
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- W2170498187 doi "https://doi.org/10.1002/(sici)1099-0488(20000101)38:1<248::aid-polb27>3.0.co;2-t" @default.
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