星形梳状聚合物在稀溶液中的链构象  

Chain Conformation of Star Comb-like Polymers in Dilute Solutions

作　　者：刘丹枫 唐增贤 丁明明 LIU Dan-feng;TANG Zeng-xian;DING Ming-ming(Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics,College of Physical Science and Technology,Yili Normal University,Yining 835000,China;School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]伊犁师范大学物理科学与技术学院新疆凝聚态相变与微结构实验室,伊宁835000 [2]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5期659-665,共7页Polymer Bulletin

基　　金：伊犁师范大学校级科研项目(项目号2022YSYB012);自治区级2022年大学生创新创业训练计划项目(项目号S202210764021)。

摘　　要：利用布朗动力学模拟研究了星形梳状聚合物链在稀溶液中的构象变化。研究结果表明,当星形梳状链的接枝密度小于0.2时,构象表现为星形,而随着接枝密度的增加,其构象逐渐变为球形。此外,拉伸因子也能较好地反映出链从星形向球形的构象转变。星形梳状链主干链的刚性受侧链长度的影响较小,但其受其接枝密度的影响较大。随着侧链长度的增加,侧链的持续长度也相应增加,但相对刚性强度随着侧链长度的增加而减弱。本文揭示了星形梳状聚合物在稀溶液中构象与分子参数的关系,有助于促进相关的表征研究。The conformation of star comb-like polymer chains in dilute solutions was investigated using Brownian dynamics simulations.The results show that when the grafting density of the star comblike chains is less than 0.2,the conformation is star-shaped.With the increase of the grafting density,the conformation gradually changes to spherical.In addition,the stretching factor can also reflect the conformational transition from star to spherical shape.The stiffness of the star comb-like chain backbone is less affected by the length of the side chains,but more affected by its grafting density.As the length of side chains increases,the persistence length of side chains increases accordingly,but the relative rigidity strength decreases with the increase in side chain length.This study reveals the relationship between conformation and molecular parameters of star comb-like polymers in dilute solutions,which helps to facilitate relevant characterization studies.

关 键 词：星形梳状聚合物 链构象 布朗动力学 

分 类 号：O631.3[理学—高分子化学]