Positron annihilation lifetime studies of free volume in a polymer electrolyte PEO complexed with NH4I

被引：0

作者：

Haldar, B

Singru, RM ^{[1
]}

Chandra, S

机构：

[1] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India

[2] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India

来源：

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 1998年 / 36卷 / 06期

关键词：

positron annihilation; conducting polymers; free volume in polymers; electrical conductivity in polymer electrolytes; analysis of positron lifetime spectra;

D O I：

暂无

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Positron lifetime spectroscopy has been applied to study the temperature dependence of free-volume properties in a solvent-free polymer-salt complex polyethylene oxide (PEO) doped with ammonium iodide (NH(4)I, with NH(4)(+)/EO approximate to 0.076) in the temperature range of 298-353 K. The observed lifetime spectra were resolved into three components and the longest lifetime, tau(3), was associated with the pick-off annihilation of ortho-positronium (o-Ps) trapped by the free volume. The lifetime component, tau(3), and its intensity, I(3), both showed a significant variation with temperature, which followed a different course in the heating and cooling cycle. Changes in the temperature coefficient of tau(3) and I(3) were observed at T approximate to 328 K, the melting point of the sample. This behaviour is correlated to the temperature variation of the electrical conductivity. (C) 1998 John Wiley & Sons, Inc.

引用

页码：969 / 976

页数：8