Sliding Dynamics of Slide-Ring Polymers Based on the Bead-Spring Model  

作　　者：Zhong-Qiang Xiong Wei Yu 

机构地区：[1]Advanced Rheology Institute,Department of Polymer Science and Engineering,State Key Laboratory for Metal Matrix Composite Materials,Shanghai Jiao Tong University,Shanghai,200240,China

出　　处：《Chinese Journal of Polymer Science》2023年第9期1410-1424,I0007,共16页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51625303 and 21790344)。

摘　　要：Understanding the sliding dynamics is critical for developing rotaxane-based mechanically interlocked polymers.In this work,we studied the sliding behavior of a sliding ring and its influence on the dynamics of attached polymer chains based on the heterogeneous beadspring model.The sliding constraint was treated as direction-related confinement with the heterogeneous friction coefficient and constraint intensity.The relaxation spectrum,the diffusion dynamics,and the sliding dynamics under/after drag were studied for typical sliding chain topologies,namely,the sliding dangling chain,the constraint sliding chain,and the sliding strand.Compared with the non-sliding chains(such as the free chain,the dangling chain,and the network strand),the slide of one or two chain ends induces an additional slow process in the transition from the Rouse-type behavior to the long-time terminal behavior.The effect of the sliding-related process on the diffusion of specific chain segments relies on the chain topology.The slow sliding relaxation process is also observed in the sliding process during and after chain deformation,whose characteristic time is at least three times the terminal relaxation time of the free chain with the same length,and will increase with the friction coefficient(i.e.,the interaction)between the ring and the polymer axial.The results of this work will benefit the understanding of the sliding dynamics in experiments.

关 键 词：Sliding chain Bead-spring model HETEROGENEITY DIFFUSION Mean conformation 

分 类 号：TQ317[化学工程—高聚物工业]