文献类型：期刊文献

英文题名：Shear flow behaviors of rod-coil diblock copolymers in solution: A nonequilibrium dissipative particle dynamics simulation

作者：Xu, Pengxiang[1];Lin, Jiaping[1];Wang, Liquan[1];Zhang, Liangshun[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, State Key Lab Bioreactor Engn,Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：146

期号：18

外文期刊名：JOURNAL OF CHEMICAL PHYSICS

收录：;EI(收录号：20172003675156);WOS:【SCI-EXPANDED(收录号:WOS:000401368900036)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant Nos. 51303055, 21234002, and 21474029). Support from Projects of Shanghai municipality (Grant Nos. 16520721900 and 14DZ2261205) is also appreciated.

语种：英文

外文关键词：Micelles - Shear flow - Functional materials - Non Newtonian flow - Dissipative particle dynamics - Shear thinning

摘要：We employed the nonequilibrium dissipative particle dynamics method to study the shear flow behaviors of rod-coil diblock copolymers in solutions. The effects of copolymer concentrations and molecular architecture on the rheology are investigated. The simulated results show that the shear flow behaviors change from Newtonian to non-Newtonian when the morphologies transform from micelles to gels by increasing the copolymer concentrations. For the non-Newtonian systems, it was found that the curve of the viscosity versus shear rate is divided into three regions, that is, shear thinning region I, platform region II, and shear thinning region III. From the physical origin, the three-region behavior is governed by the distinct flow behaviors of the rod and coil blocks and their different time scale in response to the shear field. Additionally, by tuning the molecular architectures, the simulated results reveal that the slopes in region I and region III are influenced by the length of rod and coil blocks, respectively. The present research revealed the microscopic origin of the complex rheological properties of rod-coil diblock copolymers in solutions and could provide useful information for preparing functional materials based on block copolymers. Published by AIP Publishing.