The effect of polymerization temperature on molecular weight, crystallinity, and electrical conductivity of polyaniline

被引：198
作者：
Stejskal, J [1 ]
Riede, A
Hlavata, D
Prokes, J
Helmstedt, M
Holler, P
机构：
[1] Acad Sci Czech Republ, Inst Macromol Chem, CR-16206 Prague 6, Czech Republic
[2] Univ Leipzig, Fac Phys & Geosci, D-04103 Leipzig, Germany
[3] Charles Univ, Fac Math & Phys, CR-12116 Prague 2, Czech Republic
来源：
SYNTHETIC METALS | 1998年 / 96卷 / 01期
关键词：
synthesis; solid-state polymerization; polyaniline; molecular weight; crystallinity; morphology; electrical conductivity;
D O I：
10.1016/S0379-6779(98)00064-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of the polymerization temperature (from - 50 to + 50 degrees C) on molecular weight, crystallinity, and electrical conductivity of polyaniline has been investigated. Aniline was oxidized in aqueous medium with ammonium peroxodisulfate at equimolar and excess concentrations of hydrochloric acid. The reaction mixture freezes below - 10 degrees C and the polymerization of aniline then proceeds in the solid state. As the reaction temperature decreases, both the molecular weight of polyaniline (determined by gel permeation chromatography) and its crystallinity (observed by X-ray diffraction) increase. The morphology of polyaniline changes from granular (reaction in a liquid medium) to macroporous (polymerization in the frozen state). Electrical conductivity of polyaniline is higher for samples prepared under more acidic conditions. It was found to be independent of the polymerization temperature and, consequently, of the molecular weight. (C) 1998 Elsevier Science S.A. All rights reserved.
引用
收藏
页码：55 / 61
页数：7
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