Understanding Mass Dependence of Glass Formation in Ring Polymers

作     者：Xiang-Yu Song Zhen-Yue Yang Qi-Lu Yuan Shang-Wei Li Zi-Qiang Tang Yue-Tong Dong Shi-Chun Jiang Wen-Sheng Xu Xiang-Yu Song;Zhen-Yue Yang;Qi-Lu Yuan;Shang-Wei Li;Zi-Qiang Tang;Yue-Tong Dong;Shi-Chun Jiang;Wen-Sheng Xu

作者机构：State Key Laboratory of Polymer Physics and ChemistryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Applied Chemistry and EngineeringUniversity of Science and Technology of ChinaHefei230026China School of Materials Science and EngineeringTianjin UniversityTianjin300072China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2023年第41卷第9期

页      面：1447-1461,I0008页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22222307 and 21973089) 

主　　题：Ring polymers Glass formation String model Molecular dynamics simulation 

摘      要：Having highly tunable molecular topology is one of the most important characteristics of polymers that provides these materials with a wide range of interesting and unique *** particular,ring polymers exhibit a number of properties that are markedly distinct from their linear ***,we compare and contrast the glass formation of unknotted,nonconcatenated ring and linear polymer melts having variable molecular mass based on molecular dynamics simulations of a coarse-grained *** revealing an unusual property in the structure of small rings,we discuss the mass dependence of the structural relaxation time determined from the self-intermediate scattering function over a wide range of temperatures in both ring and linear *** a general trend,we find that the characteristic temperatures(e.g.,the glass transition temperature)and fragility of glass formation increase with increasing molecular mass in linear polymers,but the mass dependences of these properties are rather weak in the family of ring polymer models considered,in broad accord with experimental ***,we show that the glass formation of ring polymers can quantitatively be described by the string model,a model that is broadly consistent with the entropy theory of glass formation and that takes the mass of string-like clusters as a molecular realization of the abstract cooperatively rearranging *** opens the possibility of applying the configurational entropy-based theories to describe the glass formation of ring polymers,once the ring topology is taken into account.