Alternating Copolymerization of Epoxides and Isothiocyanates to Diverse Functional Polythioimidocarbonates and Related Block Polymers  

作　　者：Xiao-Feng Zhu Xin-Yu Lu Cheng-Kai Xu Yu-Bo Fang Guan-Wen Yang Wei Li Jingdai Wang Guang-Peng Wu 

机构地区：[1]MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou,Zhejiang,310027 China [2]Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou,Zhejiang,310027 China

出　　处：《Chinese Journal of Chemistry》2023年第23期3311-3318,共8页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants 51973186 and 22101253);the National Science Fund for Distinguished Young Scholars(No.T2225004).

摘　　要：Synthesis of diverse polythioimidocarbonates via ring-opening copolymerization of epoxides and isothiocyanates catalyzed by organoboron catalyst was reported herein.Both aromatic and aliphatic isothiocyanates underwent successful copolymerization with terminal and internal epoxides,allowing for the precise tuning of the performance of the resultant copolymers over a broad range.The wide scope of available isothiocyanates and epoxides enables the direct construction of sulfur-containing functional polymers featuring both high glass transition temperature and refractive index.Additionally,it was observed that aromatic isothiocyanates polymerize much faster than aliphatic ones,and the reactivity difference facilitated the one-step synthesis of block polymers from mixed aromatic isothiocyanates,aliphatic isothiocyanates and epoxides due to the preferential incorporation of aromatic isothiocyanates over the aliphatic analogues during their alternating copolymerization with epoxides.The produced polythioimidocarbonates can be used as positive resists for electron beam lithography(sensitivity of 130μC/cm^(2) and contrast of 1.53 for poly(CHO-alt-EITC)).Coupling with their high refractive index(1.58—1.68),polythioimidocarbonates might find functional applications in optics.These results render ring-opening copolymerization of epoxides and isothiocyanates a facile route to enrich functional polymer library.

关 键 词：Ring-opening copolymerization Metal-free catalysis Sulfur-containing polymers Block polymers Electron beam lithography High refractive index 

分 类 号：O62[理学—有机化学]