受限高分子链的静态与动态性质  

Static and Dynamic Properties of Confined Polymer Chain

作　　者：王振华 王健[1,3] 卢宇源[1] WANG Zhen-hua;WANG Jian;LU Yu-yuan(State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;University of Science and Technology of China,Hefei 230026,China;College of Chemistry and Chemical Engineering,Cangzhou Normal University,Cangzhou 061001,Hebei,China)

机构地区：[1]中国科学院长春应用化学研究所高分子物理与化学国家重点实验室,长春130022 [2]中国科学技术大学,合肥230026 [3]沧州师范学院化学与化工学院,河北沧州061001

出　　处：《功能高分子学报》2018年第1期1-15,共15页Journal of Functional Polymers

基　　金：国家自然科学基金(21674113,21334007);中国科学院前沿科学重点研究计划项目(QYZDY-SSW-SLH027)

摘　　要：受限条件下高分子链的静态与动态性质是高分子物理学研究的重要组成部分,也是生物物理学关注的焦点问题之一。相对于自由高分子链,受限高分子链往往随受限程度和受限区域的不同而表现出一系列独特的规律性。本文首先回顾了自由空间中高分子链的基本性质,然后重点介绍了在不同受限程度下高分子链的静态性质和动力学行为,对比了不同受限区域下这些性质的差异性,并且系统总结了流场诱导下高分子链过孔的经典理论及其详细推导过程。最后,展望了受限高分子链今后的发展方向。The static and dynamic properties of confined polymer chains are not only of great importance in polymer physics,but also drawing much attention of those researchers in biophysics.The confined polymer chains exhibit a series of unique features as compared with unperturbed polymer chains.At first,by taking the Rouse,Zimm and partially permeable sphere models as examples,this review briefly outlines the fundamental properties of unperturbed polymer chains.Although the Rouse model is the simplest version of the bead-spring model and assumes there are no excluded volume and hydrodynamic interactions between the beads,it can qualitatively describe most of the polymer dynamical behaviors.By taking into account the two-body hydrodynamic interactions between beads,Zimm model successfully obtains the expressions for the diffusion coefficient and the relaxation time that agree with most experimental results of linear polymers.The partially permeable sphere model introduces two phenomenological functions,the drainage function and the drag function,and captures the physical effects due to multibody hydrodynamic interactions at the mean-field level,which provides a simple and unified framework for describing and understanding the intrinsic viscosity of polymers for any flexible chain architecture,including linear,ring,stars,to hyperbranched and dendrimers.This review then focuses on the static and dynamic properties of confined polymer chains.Depending on the value of channel size relative to the persistence length and effective width,the behaviors of a semiflexible polymer chain confined in a nanochannel can be categorized into four regimes as follows:de Gennes regime,extended de Gennes regime,Odijk regime and backfolded Odijk regime.In de Gennes regime,where the channel size is much bigger than the persistence length,the static and dynamic properties of confined semiflexible polymer chains can be explained by Blob theory and there is no essential difference between the flexible and semiflexible polymer chains.The semiflexib

关 键 词：受限高分子 受限区域 流场诱导高分子链过孔 部分穿透球模型 

分 类 号：O63[理学—高分子化学]