Effect of solvent quality on Poiseuille flow of polymer solutions in microchannels: A dissipative particle dynamics study
Effect of solvent quality on Poiseuille flow of polymer solutions in microchannels: A dissipative particle dynamics study
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溶剂质量对微通道中聚合物溶液泊肃叶流动的影响：耗散粒子动力学研究
DOI：
10.1002/app.47345
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发表时间：
2019-04
影响因子：
3
通讯作者：
Wang Jiugen
中科院分区：
文献类型：
--
作者：
Xu Shaofeng;Lou Yinghou;He Ping;Wang Xiangyang;Wang Jiugen
用耗散粒子动力学方法模拟了不同质量溶剂下聚合物溶液在微通道中的Poiffille流动。特别是，速度分布和跨通道的聚合物迁移进行了研究，良好的，无热的，和穷人的溶剂。三种溶剂的速度分布均偏离抛物线分布，无热溶剂福尔斯的速度分布介于良溶剂和不良溶剂之间。对于非热溶剂，迁移远离壁由于链和壁之间的流体动力学相互作用被观察到，和迁移远离通道中心由于不同的链布朗扩散率也被观察到。对于良溶剂，由于更拉伸的聚合物链，远离壁的迁移比非热溶剂更强。然而，对于良溶剂，没有观察到远离通道中心的迁移。对于不良溶剂，链内的流体动力学相互作用被屏蔽，并且聚合物链向壁迁移并且似乎被壁吸收。© 2018威利期刊股份有限公司J.应用聚合物Sci.2019，136，47345.
The Poiseuille flows of polymer solutions for varying quality solvents in microchannels have been simulated using dissipative particle dynamics. In particular, the velocity distributions and the polymer migration across the channel have been investigated for good, athermal, and poor solvents. The velocity profiles for all three kinds of solvent deviate from the parabolic profile, and the velocity profile of the athermal solvent falls in between the good solvent and the poor solvent. For the athermal solvent, a migration away from the wall due to the hydrodynamic interactions between the chains and the wall is observed, and a migration away from the channel center due to the different chain Brownian diffusivities is also observed. For the good solvent, because of the more stretched polymer chains, the migration away from the wall is stronger than that for the athermal solvent. However, the migration away from the channel center is not observed for good solvents. For the poor solvent, the hydrodynamic interaction within the chains is screened, and the polymer chains migrate toward the wall and appear to be absorbed by the wall. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2019,136, 47345.
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