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Citation: Wang Fosong, Zhao Xiaojiang, Wang Tanying, Cao Yong, Qian Renyuan. AIR-STABILITY OF POLYACETYLENE(PA) PREPARED WITH DIFFERENT CATALYST SYSTEMS[J]. Chinese Journal of Applied Chemistry, ;1985, 2(3): 74-76. shu

AIR-STABILITY OF POLYACETYLENE(PA) PREPARED WITH DIFFERENT CATALYST SYSTEMS

1.
1. Changchun Institute of Applied Chemistry, Academia Sinica;
2.
2. Institute of Chemistry, Academia Sinica

Received Date: 9 August 1984
Available Online: 5 February 1985
Fund Project:

A comparison of air-stability of polyacetylenes(PA) prepared by rare-earth catalyst(Ln-PA) and Shirakawa's catalyst(Ti-PA) through examination of ESR, IR, weight uptake and change of electrical conductivity on long time exposure of these PA films toair is presented. It is found that the cis/trans ratio and conductivity decreased with increasing the exposure time for both types of polymers, but the thermal isomerization rate and the decrease of conductivity of Ln-PA film appeared slower than those of Ti-PA film. Similary, a gradual decrease of conductivity was observed for I₂-doped Ln-PA.Spin concentration calculated from ESR intensity decreased with increasing exposure time in the initial stage of oxidation, then increased slightly and decreased. This seems to suggests the occurence of the oxidation reactions (see p.75 eqs. 1, 2).
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