Synthesis of copolymers of 3-acryloyloxymethyl-3′-methyloxetane and 3-(2-(2-(2-methoxyethylenoxy)ethylenoxy)ethylenoxy)-3′-methyloxetane and their ionic conductivity properties |
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Authors: | Ye Lin Zhao Yumei Feng Zengguo Bai Ying and Wu Feng |
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Affiliation: | (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 |
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Abstract: | An oxetane-derived monomer, 3-acryloyloxy-methyl-3′-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)-3′-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°C or 1.25 × 10−4 S/cm at 80°C was attained in the sample PAM 33 at the mole ratio of O: Li = 20. The DSC results indicated that T
g decreases with the increase of the proportion of AMO in the copolymer, well consistent with the ion conductivity trend. The
TGA (thermogravimetric analysis) measurement revealed that this kind of copolymer electrolytes is more thermostable than their
liquid counterparts.
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Translated from Transactions of Beijing Institute of Technology, 2006, 26(12): 1098–1103 译自: 北京理工大学学报] |
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Keywords: | Oxetane-derived monomer cationic ring-opening copolymerization polymer electrolyte ionic conductivity |
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