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Pyrolysis of polyacrylonitrile and related polymers—IV. Thermal analysis of polyacrylonitrile in the presence of additives

✍ Scribed by N. Grassie; R. McGuchan

Publisher
Elsevier Science
Year
1971
Tongue
English
Weight
580 KB
Volume
7
Category
Article
ISSN
0014-3057

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✦ Synopsis

Al~traet--The thermal behaviour of polyacrylonitrile studied by DTA and TG is shown to be greatly influenced by the presence of various types of additive. Pure PAN exhibits a very sharp exotherm at about 260 °, caused by the oligomerization of nitrile groups. This reaction can be initiated at much lower temperatures by acidic and basic compounds and broad exotherms with much reduced differential temperatures are observed. Inorganic salts such as KCN,!NaSCN and Na2S also interact efficiently. An ionic mechanism is concluded for the additive catalysed reaction but, in the absence of additives, the reaction is shown to be free radical in nature.

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