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DOI: 10.1039/A901417I (Paper) Reference Section for: J. Mater. Chem., 1999, 9, 1661-1667

Linear and network polymer electrolytes based on low melting prepolymers

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Robert A. Colley, Shao-Min Mai, Colin Booth, Peter M. Budd and Simon Balderson

Abstract

Prepolymers E4C3E4 and E3C3E3, where E represents an oxyethylene unit and C3 the spacer group -O(CH2)3O-, were prepared by anionic polymerization of ethylene oxide using propane-1,3-diol as initiator. Oxymethylene-linking polymerization of the prepolymers gave high molar mass polymers with crystalline melting points [Tm≈–8[thin space (1/6-em)]°C for P(E4C3E4) and –16[thin space (1/6-em)]°C for P(E3C3E3)] and degrees of crystallinity [ca. 25% for P(E4C3E4) and 1% for P(E3C3E3)] which could be related to the average E-sequence length. Inclusion of 2-methylenepropane-1,3-diol in the recipe for oxymethylene-linking polymerization gave crosslinkable polymers. Networks were obtained by photochemical crosslinking with benzophenone as sensitizer and network characteristics were determined by mechanical and swelling measurements. Linear and network polymer electrolytes were prepared by inclusion of lithium perchlorate at concentrations corresponding to O:Li=25 and O:Li=70, and conductivities were determined over the temperature range –20 to +80[thin space (1/6-em)]°C.

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