环状梳形聚合物在稀溶液中的链构象  

Chain Conformation of Ring Comb-like Polymers in Dilute Solution

作　　者：林铭涛 彭尔康 丁明明 LIN Ming-tao;PENG Er-kang;DING Ming-ming(School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学轻工化工学院,广州510006

出　　处：《高分子通报》2024年第6期802-807,共6页Polymer Bulletin

摘　　要：梳形聚合物已成为一类具有广泛潜在应用的新材料,但是,开发这些应用的先决条件是准确表征梳形聚合物链结构与分子参数的关系。本文采用布朗动力模拟方法探究了环状梳形聚合物链尺寸与结构特征参数的依赖关系,获得了溶液中链构象的一般描述。结合Flory理论,我们发现环状梳形链与线状梳形链类似,只有在高接枝密度时,侧链-侧链间排除体积的影响才足够显著。此外,拉伸因子可以很好地捕捉环状梳形聚合物构象变化的本质,其中回转半径与拉伸因子满足标度指数关系。本文揭示了环状梳形链尺寸与分子参数的依赖关系,明确了拉伸因子是描述链相对尺寸的可靠参量。Comb-like polymers have emerged as a new class of materials with a wide range of potential applications.However,a prerequisite for developing these applications is the accurate characterization of the chain structure concerning the molecular parameters.In this study,we use Brownian dynamics simulations to explore the dependence of the chain size on the structural characterization parameters of ring comb-like polymers and to obtain a general description of the chain conformation in solution.Combined with Flory theory,we find that the ring comb-like chains are similar to linear comb-like chains in that the effect of graft-graft excluded volume is significant enough only at high grafting densities.In addition,the stretch factor can capture the nature of conformational changes in ring comb-like polymers,where the radius of gyration and the stretch factor satisfy a scaling exponential relationship.In this paper,we reveal the dependence of the size of the ring comb-like chains on the molecular parameters and clarify that the stretch factor is a reliable covariate to describe the relative size of ring comb-like chains.

关 键 词：环状梳形聚合物 布朗动力学 链构象 

分 类 号：TQ317[化学工程—高聚物工业]