Citation: Juan Li, Yi-jing Nie, Yu Ma, Wen-bing Hu. STRESS-INDUCED POLYMER DEFORMATION IN SHEAR FLOWS[J]. Chinese Journal of Polymer Science, ;2013, 31(11): 1590-1598. doi: 10.1007/s10118-013-1354-0 shu

STRESS-INDUCED POLYMER DEFORMATION IN SHEAR FLOWS

Juan Li ¹ ,
Yi-jing Nie ¹ ,
Yu Ma ¹ ,
Wen-bing Hu ^1,,

1.
Department of Polymer Science and Engineering, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China

Corresponding author: Wen-bing Hu,
Received Date: 4 February 2013
Revised Date: 14 April 2013

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 20825415 and 21274061) and the National Basic Research Program of China (No. 2011CB606100).

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.
- Polymer deformation,
- Monte Carlo simulation,
- Shear flow
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