Mainchain Semifluorinated Polymers with Ultra High Molecular Weight via Reaction-enhanced Reactivity of Intermediate(RERI) Mechanism  

作　　者：Jia-Sheng Wu Wang-Meng Hou Zhi-Jia Liu Yi Shi Yong-Ming Chen 

机构地区：[1]School of Materials Science and Engineering,Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education,Sun Yat-Sen University,Guangzhou 510006,China

出　　处：《Chinese Journal of Polymer Science》2023年第5期760-767,I0009,共9页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.22071271)。

摘　　要：Achieving the linear polymers with high molecular weight via step-growth polymerization of A2 and B2 monomers is significantly limited by the requirement of strict stoichiometry of two monomers when the reactivity of A and B groups are not changed during the polymerization.Herein,a unique step-growth polymerization based on copper-catalyzed azide-alkyne cycloaddition(CuAAC)with reactionenhanced reactivity of intermediate(RERI)mechanism was developed for the preparation of mainchain semifluorinated polymers with high molecular weight.The CuAAC polymerization of bis-alkynyl-terminated fluorinated monomers(A2)and 2,2-bis(azidomethyl)propane-1,3-diyl bis(2-methylpropanoate)(BiAz,B2)with RERI effect at different stoichiometric ratio was systematically investigated.The results indicated that the semifluorinated polymers with ultrahigh molecular weight,Mw,MALLS>106 g/mol,could be efficiently synthesized by using excess molar of BiAz monomers.The resultant high-molecular-weight semifluorinated polymers show good thermostability and high hydrophobicity.In addition,the glass transition temperature(Tg)of these mainchain semifluorinated polymers could be tuned conveniently due to the bis-alkynyl-terminated comonomers could be consumed completely when excessive BiAz monomers were used in this this step-growth polymerization.

关 键 词：Semifluorinated polymers Click polymerization Step-growth polymerization 

分 类 号：O631.5[理学—高分子化学]