Poly(thioether)-b-polysiloxane-b-poly(thioether)triblock copolymer towards homogeneous dielectric elastomer with high dielectric performance  

作　　者：Zhanbin Feng Jiafang Guo Suting Liu Guofei Feng Xing-Hong Zhang 

机构地区：[1]MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China [2]Center of Chemistry for Frontier Technologies,Zhejiang University,Hangzhou 310027,China [3]Department of Chemical Engineering,Weifang Vocational College,Weifang 262737,China

出　　处：《Chinese Chemical Letters》2022年第8期4021-4025,共5页中国化学快报（英文版）

基　　金：National Natural Science Foundation of China(Nos.51973190 and 21774108);Zhejiang Provincial Department of Science and Technology(No.2020R52006)for financial supports。

摘　　要：Dielectric elastomers(DEs)have drawn much attention owing to their application prospects in artificial muscles and soft robotics,it is still a big challenge to prepare DEs with high electromechanical performances.This work reports a highly stretchable poly(thioether)-b-polysiloxane-b-poly(thioether)triblock copolymer based homogenous DEs with high electromechanical properties.The triblock copolymer(PSiPGE)was synthesized through the ring-opening polymerization(ROP)of phenyl glycidyl ether(PGE)and carbonyl sulfide(COS)catalyzed by silicon alkoxides.The dipoles(benzene rings)on the side groups of PSiPGE improved the dipole polarizations and the phase separation structure of this triblock copolymer enhanced the interfacial polarizations between poly(thioether)and polysiloxane,and thus improving the dielectric constant(ε',up to 5.8).In addition,the PSiPGE exhibited low elastic modulus(Y,0.04 MPa),and thus possessed high electromechanical sensitivity(β,~145 MPa^(-1)) which is much higher than that of most homogenous DEs.This work provides a new strategy to construct homogenous DEs with excellent electromechanical performances,leading to a greater application aspect in the actuated devices.

关 键 词：Poly(thioether)-b-polysiloxane-bpoly(thioether)triblock copolymer HOMOGENOUS Dielectric elastomer Phase separation Electromechanical performance 

分 类 号：TQ334[化学工程—橡胶工业]