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Polymerization of molten salt monomers having a phenylimidazolium group
Author(s) -
Hirao Michiko,
ItoAkita Kaori,
Ohno Hiroyuki
Publication year - 2000
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/1099-1581(200008/12)11:8/12<534::aid-pat2>3.0.co;2-r
Subject(s) - molten salt , glass transition , ionic liquid , materials science , salt (chemistry) , ionic conductivity , lithium (medication) , polymer , ionic bonding , imide , monomer , polymerization , conductivity , alkyl , polymer chemistry , inorganic chemistry , ion , organic chemistry , chemistry , composite material , catalysis , metallurgy , electrode , medicine , electrolyte , endocrinology
Several kinds of imidazolium salts having a phenyl group were prepared to investigate the property of room temperature molten salts. N‐Alkylimidazoles were neutralized to obtain mono‐alkylimidazolium salts (RImX) as model compounds of 1,3‐dialkylimidazolium salts (R,R′ImX). Some of RImX salts formed room temperature molten salts. According to the data of RImX, alkyl group was selected for the design of R,R′ImX. R,R′ImX obtained through this procedure showed relatively high ionic conductivity about 10 −4 S cm −1 at 30 °C. The polymers having these molten salt structures in the side chains were also prepared. The ionic conductivity of the obtained polymers in the bulk decreased to 10 −6 S cm −1 at 30 °C. When lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) was added equimolarly to polymers, the glass transition temperature (T g ) decreased and their mechanical properties were improved from glassy solids to adhesive film. The ionic conductivity was improved up to 10 −5 S cm −1 . The introduction of a phenyl group into imidazolium salts was confirmed to be effective to improve the film property of molten salt polymers. Copyright © 2000 John Wiley & Sons, Ltd.