EXTENSIONAL FLOW OF BULK POLYMERS STUDIED BY DYNAMIC MONTE CARLO SIMULATIONS  

作　　者：Yu Ma Xiao-hong Zhang 胡文兵 

机构地区：[1]Department of Polymer Science and Engineering,State Key Laboratory of Coordination Chemistry,School of Chemistry and Chemical Engineering,Nanjing University [2]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University [3]Anhui Tong Feng Electronics Corporation

出　　处：《Chinese Journal of Polymer Science》2013年第11期1463-1469,共7页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.20825415 and 21274061);the National Basic Research Program of China(No.2011CB606100)

摘　　要：Dynamic Monte Carlo simulations of bulk lattice polymers driven through planar geometries with sequentially converging, parallel and diverging spaces between two neutrally repulsive solid plates are reported. The spatial profiles of polymer velocity and deformation along the course of such a laminar extensional flow have been carefully analyzed. The results appear consistent with experimental observations in literature. In the entrance and exit regions, a linear dependence of chain extension upon the excess velocity has been observed. Moreover, an annexed shear flow and a molecular-dispersion effect are found. The results demonstrate a useful strategy of this approach to study polymer flows and bring new insights into the non-Newtonian-fluid behaviors of bulk polymers in capillary rheometers and micro-fluidic devices.Dynamic Monte Carlo simulations of bulk lattice polymers driven through planar geometries with sequentially converging, parallel and diverging spaces between two neutrally repulsive solid plates are reported. The spatial profiles of polymer velocity and deformation along the course of such a laminar extensional flow have been carefully analyzed. The results appear consistent with experimental observations in literature. In the entrance and exit regions, a linear dependence of chain extension upon the excess velocity has been observed. Moreover, an annexed shear flow and a molecular-dispersion effect are found. The results demonstrate a useful strategy of this approach to study polymer flows and bring new insights into the non-Newtonian-fluid behaviors of bulk polymers in capillary rheometers and micro-fluidic devices.

关 键 词：Polymer deformation Extensional flow Monte Carlo simulations. 

分 类 号：O631.21[理学—高分子化学]