Synthesis of copolymers of 3-acryloyloxymethyl-3'-methyloxetane and 3-(2-(2-(2-Methoxyethylenoxy)ethylenoxy)ethylenoxy)-3'-methyloxetane and their ionic conductivity properties  

作　　者：YE Lin ZHAO Yumei FENG Zengguo BAI Ying WU Feng 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China [2]School of Chemical Engineering and Environment,Beijing Institute of Technology,Beijing 100081,China [3]Laboratory of National Development Center of Hi-Tech Green Materials,Beijing 100081,China

出　　处：《Frontiers of Chemical Science and Engineering》2007年第4期343-348,共6页化学科学与工程前沿（英文版）

基　　金：This research work was supported by the State Key Development Program for Basic Research of China(Grant No.2002CB211800).

摘　　要：An oxetane-derived monomer,3-acryloyloxy-methyl-3p-methyloxetane(AMO)was prepared from the reaction of 3-hydromethyl-3-methyloxetane with acryloyl chloride.The cationic ring-opening copolymerization of AMO with another oxetane-derived monomer,3-(2-(2-(2-methoxyethylenoxy)ethylenoxy)ethylenoxy)-3p-methyloxetane(MEMO)was conducted in CH2Cl2 solution using BF3·OEt2/1,4-butanediol as a co-initiator.The resulting copolymers were characterized by FTIR,1H NMR and Gel Permeation Chromatography(GPC)analyses,and it was found that the enchained ratio of AMO in the copolymers is far lower than its feed ratio.They were crosslinked in situ via the radical polymerization of the vinyl group initiated by BPO after doping with lithium trifluoromethanesulfonimide(LiTFSI)to give rise to tough polymeric electrolyte films.The ionic conductivity was measured at varying content of AMO and different concentration of lithium salt LiTFSI by AC impedance,and a maximum ion conductivity of 1.44×10^(−5) S/cm at 30℃ or 1.25×10^(−4) S/cm at 80℃ was attained in the sample PAM 33 at the mole ratio of O:Li=20.The DSC results indicated that Tg decreases with the increase of the proportion of AMO in the copolymer,well consistent with the ion conductivity trend.The TGA(thermo-gravimetric analysis)measurement revealed that this kind of copolymer electrolytes is more thermostable than their liquid counterparts.

关 键 词：Oxetane-derived monomer cationic ring-opening copolymerization polymer electrolyte ionic conductivity 

分 类 号：O63[理学—高分子化学]