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Relaxation time and conductivity of comb‐like gel polymer electrolytes
Author(s) -
Qi Li,
Dong Shaojun
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25610
Subject(s) - glass transition , polymer chemistry , materials science , copolymer , plasticizer , polymer , ethylene glycol , methyl methacrylate , ether , methacrylate , relaxation (psychology) , electrolyte , chemical engineering , chemistry , organic chemistry , composite material , psychology , social psychology , electrode , engineering
Using the copolymer of acrylonitrile (AN), methyl methacrylate (MMA), and poly(ethylene glycol) methyl ether methacrylate as a backbone and poly(ethylene glycol) methyl ether (PEGME) with 1100 molecular weight as side chains, comb‐like gel polymers and their Li salt complexes were synthesized. The dynamic mechanical properties and conductivities were investigated. Results showed that the gel copolymer electrolytes possess two glass transitions: α‐transition and β‐transition. Based on the time–temperature equivalence principle, a master curve was constructed by selecting T α as reference temperature. By reference to T 0 = 50°C, the relation between log τ c and c was found to be linear. The master curves are displaced progressively to higher frequencies as the content of plasticizer is increased. The relation between log τ p and the content of plasticizer is also linear. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 576–584, 2007