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- W2892308330 abstract "Controlling polymer viscosity and flow is key to their many applications through strength and processability. The topology of the polymer i.e., linear, stars, and branched, affects the macroscopic flow characteristics of melts, where introducing one branch is sufficient to increase the viscosity significantly. While a number of studies have probed the effects of polymer topology on their rheology, the molecular understanding that underlies the macroscopic behavior remains an open question. The current study uses molecular dynamics simulations to resolve the effects of topology of polymer melts on chain mobility and viscosity in the comb regime using polyethylene as a model system. A coarse-grained model where four methylene groups constitute one bead is used, and the results are transposed to the atomistic level. We find that while the number of branches only slightly affects the chain mobility and viscosity, their length strongly impacts their behavior. The results are discussed in terms of interplay between the relaxation of the branches and reptation of the backbone where the topology of the polymer affects the tube dimensions." @default.
- W2892308330 created "2018-09-27" @default.
- W2892308330 creator A5067183345 @default.
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- W2892308330 date "2018-09-20" @default.
- W2892308330 modified "2023-10-16" @default.
- W2892308330 title "Polymer Topology Effects on Dynamics of Comb Polymer Melts" @default.
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- W2892308330 doi "https://doi.org/10.1021/acs.macromol.8b01449" @default.
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