Preparation and ionic conductivity of poly(ethylene oxide) oligomers having thiolate groups on the chain ends
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作者:
Ken-ichi Kato
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机构:Department of Biotechnology,
Ken-ichi Kato
Kaori Ito-Akita
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h-index: 0
机构:Department of Biotechnology,
Kaori Ito-Akita
Hiroyuki Ohno
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机构:Department of Biotechnology,
Hiroyuki Ohno
机构:
[1] Department of Biotechnology,
[2] Tokyo University of Agriculture and Technology,undefined
[3] Koganei,undefined
[4] Tokyo 184,undefined
[5] Japan Tel./Fax: +81-423-887024,undefined
来源:
Journal of Solid State Electrochemistry
|
2000年
/
4卷
关键词:
Key words Poly(ethylene oxide);
Ionic conductivity;
Thiolate;
Glass transition temperature;
D O I:
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学科分类号:
摘要:
Poly(ethylene oxide) (PEO) oligomers having alkali metal thiolate groups on the chain ends (PEOm-S−M+) were prepared as an ion conductive matrix. The molecular weight of the PEO part (m) and the content of the thiolate groups in the molecule were changed to analyze the effect of carrier ion concentration in the bulk. In a series of potassium salt derivatives, PEO350-SK showed the highest ionic conductivity of 6.42 × 10−5 S/cm at 50 °C. In spite of a poor degree of dissociation which was derived from the acidity of the thiolate groups, PEOm-SM showed quite high ionic conductivity among other PEO/salt hybrids. PEOm-SM had glass transition temperatures (Tg) 20 °C lower than other PEO/salt hybrids. Lowering the Tg was concluded to be effective in providing higher ionic conductivity for PEO-based polymer electrolytes.