ISSN:
1042-7147
Keywords:
Ion transport
;
Salt dissociation
;
Mechanical properties
;
Matrix polarity
;
Polymer media
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Copolymers of oligo(oxyethylene) methacrylates and a series of polar comonomers, i.e. acrylamide, acrylonitrile and maleic anhydride, were synthesized as media for dual- or single-ion conduction, and correlation between polymer structure and properties was established through detailed studies on polymer morphology, mechanical property and the ion transport process. Polar groups in the polymer chain sequence were found to enhance matrix polarity and to retard oligoether crystallization, as well as to raise chain rigidity. Therefore, both novel dual- and single-ion conduction are realized, with a simultaneous improvement in the mechanical properties of polymer materials. An investigation about the effect of matrix polarity on the ion transport process is also carried out, making use of the concepts concerning polymer segmental relaxation. Hence the enhanced matrix polarity is found to contribute to the improvement in ion conduction, mainly through its promotion of salt dissociation. However, at high temperature this facilitation is counteracted due to the “anomalous” temperature-dependence of salt dissociation in the polymer matrix, and the higher the matrix polarity, the more drastic is the drop in carrier number with rising temperature.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pat.1992.220030204
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