DBU/碘化锂双催化体系催化三亚甲基碳酸酯开环均聚合  

Ring-opening polymerization of trimethylene carbonate catalyzed by DBU/lithium iodide dual catalytic system

作　　者：王艳 肖慧萍 马叶群 WANG Yan;XIAO Hui-ping;MA Ye-qun(The Center of Analysis and Test,Shanxi Normal University,Taiyuan 030031,Shanxi,China;Changchun Ecological Environment Monitoring Center,Changchun 130012,Jilin,China;School of Chemistry and Materials Science,Shanxi Normal University,Taiyuan 030031,Shanxi,China)

机构地区：[1]山西师范大学分析测试中心,山西太原030031 [2]吉林省长春生态环境监测中心,吉林长春130012 [3]山西师范大学化学与材料科学学院,山西太原030031

出　　处：《西北师范大学学报（自然科学版）》2024年第2期71-76,共6页Journal of Northwest Normal University(Natural Science)

基　　金：山西省基础研究计划资助项目(2015011029);山西师范大学博士科研基金资助项目(020720170002)。

摘　　要：以1,8-二氮杂二环[5.4.0]十一碳-7-烯(DBU)/碘化锂(LiI)为双催化剂,苯甲醇(BnOH)协同催化单体三亚甲基碳酸酯(TMC)开环均聚合,得到产物聚三亚甲基碳酸酯(PTMC).反应的最优条件为:二氯甲烷为溶剂,[TMC]=1.0 mol·L^(-1),[TMC]/[DBU]/[LiI]/[BnOH]=200∶1∶1∶1,25℃下反应45 min,所得PTMC的产率为97.7%,数均分子量为20.4 kg·mol^(-1),分子量分布为1.19.DSC热分析结果表明,PTMC没有熔融峰和结晶峰,说明PTMC为一种无定形聚合物.利用1HNMR和IR对PTMC结构进行端基分析,并推测聚合机理为“单体-活化”机理.The ring-opening homopolymerization of trimethylene carbonate(TMC)catalyzed by 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)/lithium iodide(LiI)is systematically studied in coordination with benzyl alcohol(BnOH).The polytrimethylene carbonate(PTMC)is obtained.The optimum condition of the polymerization reaction was as follows:[TMC]=1.0 mol·L^(-1),[TMC]/[DBU]/[LiI]/[BnOH]=200∶1∶1∶1,T=25℃,t=45 min,and dichloromethane as solvent.The yield of PTMC can reach 97.7%.The number average molecular weight of the polymer is 20.4 kg·mol^(-1)and the molecular weight polydispersity is 1.19.The DSC measurement of PTMC displays no melting peak and no crystalline peak and it further shows that PTMC is an amorphous polymer.The structure of PTMC is confirmed by 1HNMR and IR techniques,and the polymerization mechanism is inferred via a“monomer-activated”process.

关 键 词：DBU 碘化锂 聚三亚甲基碳酸酯 开环聚合 

分 类 号：O632.1[理学—高分子化学]