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Pyrolysis of polyacrylonitrile and related polymers—I. Thermal analysis of polyacrylonitrile

✍ Scribed by N. Grassie; R. McGuchan

Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
815 KB
Volume
6
Category
Article
ISSN
0014-3057

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✦ Synopsis

AbstraetmThe thermal degradation of polyacrylonitrile has been studied using the techniques of thermogravimetry, differential thermal analysis and thermal volatilization analysis. The influence of experimental conditions on the results is examined. The very sharp exothermic reaction below 300 ° is an important feature of programmed pyrolysis in an inert atmosphere; it corresponds to the thermal polymerization of nitrile groups. It can be removed completely by isothermal ageing below 200 ° during which treatment there is negligible weight loss. Oxygen has a marked inhibiting effect on the exothermic reaction; in air pyrolysis, the exotherm occurs at higher temperatures. The development of colour, in relation to the thermoanalytical curves, and the reactions occurring between 250 ° and 1000 ° are discussed.

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Acidic comonomers exert a strong initiating effect on the exothermic nitrile group oligomerization in polyacrylonitrile. In contrast to the sharp intense transitions for pure homopolymers, the exotherms for the copolymers are very broad with much reduced differential temperatures. This is explained