Dynamics of Charged Ring Polymers under Gel Confinement  

作　　者：Lu-Jie Huo Kai-Ru Qu Zhen-Zhong Yang Di Jia 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Institute of Polymer Science and Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Journal of Polymer Science》2025年第3期399-405,共7页高分子科学(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.22273114);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB0770101);the National Key R&D Program of China(No.2023YFE0124500),the National Key R&D Program of China(No.2023YFC2411203);International Partnership Program of the Chinese Academy of Sciences(No.027GJHZ2022061FN)。

摘　　要：Ring polymers are ubiquitous in various fields including biomaterials,drug release and gene therapy.All of these applications involve the dynamics and diffusion process of ring polymers in a confined environment.By using dynamic light scattering(DLS),we discovered a dynamical transition for charged ring polymers with increasing ring concentration in the gel matrix from a diffusive state to a non-diffusive topological frustrated state with a more compact conformation.When the ring polymer size is smaller than the mesh size of the gel matrix,the rings are diffusive at low concentration of 5 g/L.The ring diffusion coefficient in the gel matrix is an order of magnitude smaller than that of rings in solution,obeying the Ogston's model.At high ring concentration of 40 g/L,the collective dynamical behavior of the charged rings exhibits a topologically frustrated non-diffusive state,which may originate from the inter-ring threading with the external confinement from the gel matrix.Based on our previous theoretical work,we also conjectured that in such a non-diffusive state,the ring polymers might adopt a more compact conformation with the overall size exponentν=1/3.

关 键 词：Charged ring polymer Dynamics under confinement Non-diffusive topologically frustrated dynamics Dynamic light scattering Collective diffusion coefficient 

分 类 号：O63[理学—高分子化学]