THERMAL BEHAVIOR AND IONIC CONDUCTIVITY OF POLY[LITHIUM-N(4-SULFO-PHENYL) MALEIMIDE -CO-METHOXY OLIGO(OXYETHYLENE) METHACRYLATE]

Autor:	Wu Xu, Kok Siong Siow, Zhiqiang Gao, Swee Yong Lee
Rok vydání:	1999
Předmět:	Materials science Polymers and Plastics chemistry.chemical_element Ionic bonding General Chemistry Macromonomer Polyelectrolyte chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Ceramics and Composites Copolymer Side chain Ionic conductivity Lithium Maleimide
Zdroj:	Journal of Macromolecular Science, Part A. 36:775-794
ISSN:	1520-5738 1060-1325
DOI:	10.1081/ma-100101563
Popis:	Poly[lithium-N(4-sulfophenyl) maleimide -co- methoxy oligo-(oxyethylene) methacrylates] [P(LiSMOEn)s] with three different oligoether side chains and different salt concentrations were synthesized. The copolyelectrolytes are essentially random in structure, with blocks of methoxy oligo(oxyethylene) meth-acrylate (MOEnM) recurring sporadically in between the salt units of N(4-sulfophenyl) maleimide. They all show two glass transitions in the temperature range of −100 to 100°C. The first one below −30°C is assigned to the oligo(oxyethylene) side chain (T g1), while the second one located between 20 and 50°C is attributed to the main chain of the polymer host (T g2). The maximum ionic conductivity of the copolymer electrolytes, 1.6 × 10−7 S cm−1 at 25°C, occurs at lithium salt concentration [Li+]/[EO] = 2.2 mol%. The ionic conductive behavior of the copolyelectrolytes follows the Vogel-Tammann-Fulcher (VTF) equation. Moreover, a special VTF behavior exists in the copolymers with shorter oligoether side chain...
Databáze:	OpenAIRE
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