Probing relationship between structure and viscosity of unentangled polymers in steady shear flow

doi:10.1007/s11426-017-9129-3

CORC > 化学研究所 > 中国科学院化学研究所

	Probing relationship between structure and viscosity of unentangled polymers in steady shear flow
	Xu, Xiaolei; Chen, Jizhong; An, Lijia
刊名	SCIENCE CHINA-CHEMISTRY
	2017-12-01
卷号	60 期号:12 页码:1609-1616
关键词	Molecular Dynamics Simulation Polymer Shear Flow Viscosity
ISSN号	1674-7291
DOI	10.1007/s11426-017-9129-3
英文摘要	Structural responses of unentangled polymers of various architectures, including linear, ring, star, asymmetric star, and H-shaped polymers, in steady shear flow are investigated via nonequilibrium molecular dynamics simulations. As observed in our previous simulations, these polymers, when having an identical equilibrium mean-square radius of gyration < R (2) (g0)> exhibit the same viscosity curve in both the linear and nonlinear regimes. In this article, the polymer orientation and deformation and the rate of deformation are calculated as a function of shear rate. The differences between different architectures in most of these properties are found to be related to the polymer extensibility, the number of free ends and the ability of folding. The unique architecture-independent quantity is the gradient component < G (yy) > of the radius of gyration tensor. We find that a simple relation eta=C (eta) < R (2) (g0)>(3 < G (yy) >/< R (2) (g0)>)(3/2) gives a near-perfect fit to shear viscosity eta data, where C (eta) is a constant. The results suggest that this relation between chain thickness and viscosity is universal for unentangled polymers of various architectures.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000417935600019
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/45349]
专题	中国科学院化学研究所
通讯作者	Chen, Jizhong
作者单位	Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China
推荐引用方式 GB/T 7714	Xu, Xiaolei,Chen, Jizhong,An, Lijia. Probing relationship between structure and viscosity of unentangled polymers in steady shear flow[J]. SCIENCE CHINA-CHEMISTRY,2017,60(12):1609-1616.
APA	Xu, Xiaolei,Chen, Jizhong,&An, Lijia.(2017).Probing relationship between structure and viscosity of unentangled polymers in steady shear flow.SCIENCE CHINA-CHEMISTRY,60(12),1609-1616.
MLA	Xu, Xiaolei,et al."Probing relationship between structure and viscosity of unentangled polymers in steady shear flow".SCIENCE CHINA-CHEMISTRY 60.12(2017):1609-1616.