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Diffusion of a Ring Threaded on a Linear Chain 被引量:2
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作者 Zhen-Hua Wang Yu-Yuan Lu +2 位作者 Hui Jin Chuan-Fu Luo Li-Jia An 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2020年第12期1409-1417,共9页
A mesoscopic simulation is applied to investigate the effects of hydrodynamic interactions and axial chains on the dynamics of threaded rings.The hydrodynamic interactions significantly speed up the diffusion and rela... A mesoscopic simulation is applied to investigate the effects of hydrodynamic interactions and axial chains on the dynamics of threaded rings.The hydrodynamic interactions significantly speed up the diffusion and relaxation of both free and threaded rings.The decoupled diffusion and relaxation dynamics indicate the broken of the Einstein-Stokes relationship.The diffusion of a ring threaded on a flexible chain exhibits a synergism effect compared to that on an axial rod,which originates from the self-diffusion of the ring and the reptation-like motion of the axial chain.Meanwhile,hydrodynamic interactions significantly improve the synergism effect,leading to an enhanced sliding motion of the threaded ring.The faster sliding of threaded rings suggests that the entropic barrier is negligible,which agrees well with the basic assumption of barrier-less confining tube at equilibrium in tube theory.Our results provide a new perspective on analysis of the effects of topology constraints on polymer dynamics. 展开更多
关键词 Hydrodynamic interactions Threaded ring Sliding dynamics Diffusion and relaxation
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Random Binary Brush Architecture Enhances both Ionic Conductivity and Mechanical Strength at Room Temperature 被引量:1
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作者 Yu-Feng Lyu Zhi-Jie Zhang +3 位作者 Chang Liu Zhi Geng Long-Cheng Gao Quan Chen 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2018年第1期78-84,共7页
The ionic conductivity and the mechanical strength are two key factors for the performance of poly(ethylene oxide)(PEO) based polyelectrolytes. However, crystallized PEO suppresses ion conductivity at low temperat... The ionic conductivity and the mechanical strength are two key factors for the performance of poly(ethylene oxide)(PEO) based polyelectrolytes. However, crystallized PEO suppresses ion conductivity at low temperature and melted PEO has low mechanical strength at high temperature. Here, random binary brush copolymer composed of PEO-and polystyrene(PS)-based side chains is synthesized. PEO crystallinity is suppressed by the introduction of PS brushes. Doping with lithium trifluoromethanesulfonate(Li Tf) induces microphase separation. Due to a random arrangement of the brushes, the microphase segregation is incomplete even at high salt loading, which provides both high ionic conductivity and high mechanical strength at room temperature. These results provide opportunities for the design of polymeric electrolytes to be used at room temperature. 展开更多
关键词 Binary brush copolymer PEO Ionic conductivity Phase separation
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