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• W2330293722 startingPage "9675" @default.
• W2330293722 abstract "For entangled linear monodisperse polymers, uniaxial elongational flow behavior was examined with the primitive chain network (PCN) simulation, which was originally formulated for a network of Gaussian chains bound by sliplinks but was modified in this study to properly take into account the finite extensibility of actual chains. On an increase of the elongational rate ε̇ from the terminal relaxation frequency 1/τd (at equilibrium) to the Rouse relaxation frequency 1/τR, the original and modified simulations gave an indistinguishable steady state elongational viscosity ηE that almost scaled as ε̇–1/2. On a further increase of ε̇ > 1/τR, ηE obtained from the original PCN simulation diverged to infinity (as noted also for the unentangled Rouse chains). In contrast, ηE deduced from the modified simulation increased but did not diverge with increasing ε̇ > 1/τR (similarly to the behavior of FENE dumbbells). This feature of the modified PCN simulation, i.e., hardening to a finite (nondiverging) level, mimicked the ηE data of entangled semidilute solutions, which naturally reflected the finite extensibility of actual chains. Analysis of the simulation results suggested that the power law behavior (ηE ∼ ε̇–1/2) at 1/τd < ε̇ < 1/τR is related to reduction of the entanglement density and the corresponding reduction of chain tension, while the hardening (upturn of ηE at ε̇ > 1/τR) results from stretch of the chain (eventually approaching full stretch), thus shedding light on the behavior of semidilute solutions. Nevertheless, the modified simulation did not describe the behavior of entangled melts, i.e., ηE ∼ ε̇–1/2 even at ε̇ > 1/τR. A factor missing in the modified simulation is discussed in an attempt to elucidate, from a molecular point of view, the difference between entangled solutions and melts." @default.
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• W2330293722 date "2011-12-01" @default.
• W2330293722 modified "2023-10-04" @default.
• W2330293722 title "Primitive Chain Network Simulation of Elongational Flows of Entangled Linear Chains: Role of Finite Chain Extensibility" @default.
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• W2330293722 doi "https://doi.org/10.1021/ma202166y" @default.
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