STRESS-INDUCED POLYMER DEFORMATION IN SHEAR FLOWS  

作　　者：Juan Li Yi-jing Nie Yu Ma 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

出　　处：《Chinese Journal of Polymer Science》2013年第11期1590-1598,共9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：By means of dynamic Monte Carlo simulation of bulk lattice polymers in Couette shear flow, it was demonstrated that in addition to velocity gradient the constant driving forces acting as the activation aspect of shear stresses can also raise polymer deformation. Moreover, enhancing driving forces in a flow without any velocity gradient can reproduce non- Newtonian fluid behaviors of long-chain polymers. The simulations of Poiseuille shear flow with a gradient of shear stresses show that, the velocity gradient dominates small deformation in the flow layers of low shear stresses, while the shear stress dominates large deformation in the flow layers of high shear stresses. This result implies that the stress-induced deformation could be mainly responsible for the occurrence of non-Newtonian fluid behaviors of real polymers at high shear rates.By means of dynamic Monte Carlo simulation of bulk lattice polymers in Couette shear flow, it was demonstrated that in addition to velocity gradient the constant driving forces acting as the activation aspect of shear stresses can also raise polymer deformation. Moreover, enhancing driving forces in a flow without any velocity gradient can reproduce non- Newtonian fluid behaviors of long-chain polymers. The simulations of Poiseuille shear flow with a gradient of shear stresses show that, the velocity gradient dominates small deformation in the flow layers of low shear stresses, while the shear stress dominates large deformation in the flow layers of high shear stresses. This result implies that the stress-induced deformation could be mainly responsible for the occurrence of non-Newtonian fluid behaviors of real polymers at high shear rates.

关 键 词：Polymer deformation Monte Carlo simulation Shear flow. 

分 类 号：O631.21[理学—高分子化学]