环基高分子缩聚体系的统计特征  

Statistical Properties of Ring-based Polymers Formed in Polycondensation Systems

作　　者：李江涛[1] 赵欣欣 顾芳[1] 王海军[1,2,3] LI Jiangtao;ZHAO Xinxin;GU Fang;WANG Haijun(College of Chemistry and Material Science,Baoding 071002,China;Chemical Biology Key Laboratory of Hebei Province,Baoding 071002,China;Key Laboratory of Medicinal Chemistry and Molecular Diagnosis,Ministry of Education,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学化学与材料科学学院,保定071002 [2]河北省化学生物学重点实验室,保定071002 [3]药物化学与分子诊断教育部重点实验室,保定071002

出　　处：《高等学校化学学报》2023年第4期228-233,共6页Chemical Journal of Chinese Universities

基　　金：河北省自然科学基金(批准号:B2022201050);河北省省级研究生示范课程项目(批准号:KCJSX2021007);河北大学研究生创新资助项目(批准号:HBU2022bs001)资助。

摘　　要：针对由RBf型环形高分子和ABg型单体构成的环基高分子缩聚体系,从环基高分子的尺寸分布导出相应的高分子矩,进而给出环基高分子的数均分子量和重均分子量以及多分散指数等物理量.在此基础上,集中探讨了两类反应物的摩尔比、环形高分子的官能度及聚合度(分子量)对环基(环基链状和环基支化)高分子性质的影响.鉴于环形高分子对环基高分子相关特征的贡献可以发生主次转变,进而根据其数均分子量得到发生转变的反应程度.结果表明,环基高分子的多分散指数随着环形高分子官能度的增加而单调降低,但与反应物的摩尔比无关,而表征环形高分子贡献发生逆转的反应程度则与其官能度、聚合度及反应物的摩尔比密切相关.相关研究可为阐明环基高分子缩聚反应体系的统计特征提供有益的线索.We present statistical properties of ring-based polymers formed in the polycondensation system consisting of ring polymers of RBf type and monomers of ABg type.The number-and weight-average molecular weights as well as polydispersity index of ring-based polymers are explicitly given.Furthermore,the effect of the molar ratio of reactants,the functionality and degree of polymerization of ring polymers on the average properties of ring-based linear and branched polymers are carried out.Consequently,a critical conversion is proposed,at which an inversion in the contribution of ring polymers to average properties of ring-based polymers takes place.Meanwhile,the polydis⁃persity index of ring-based polymers decreases with functionality but does not depend on the molar ratio of reactants,while the critical conversion is closely related to all the above-mentioned factors.It is expected that the present results would be useful to elucidate the average properties of ring-based polymers prepared in the system under consideration.

关 键 词：环基高分子 重均分子量 多分散指数 尺寸分布 

分 类 号：O631[理学—高分子化学]