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- W1994892993 abstract "The viscosity η of polymer melts experimentally scales with the length L of the chains as a power law with an exponent b ≈ 3.4 larger than the prediction b = 3 from de Gennes’ theory of reptation. This long-standing controversy is revisited within the repton and necklace models. Exact results from the rigid chain dynamics allow us to predict the leading order viscosities and renewal times for chains with fluctuating lengths and/or center-of-mass initial position fluctuations. The corrections to scaling are determined by numerical simulations to behave as L−1/2 in all cases. Such large effects may explain (a) the apparent exponent observed experimentally, (b) confirm the corrections due to the contour length fluctuations, and (c) highlight the importance of the relaxation of longitudinal modes." @default.
- W1994892993 created "2016-06-24" @default.
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- W1994892993 date "2010-10-13" @default.
- W1994892993 modified "2023-09-25" @default.
- W1994892993 title "Viscosity and Renewal Time of Polymer Reptation Models" @default.
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- W1994892993 doi "https://doi.org/10.1021/ma1015402" @default.
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