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The influence of molecular weight on the degradation of poly(N-vinylcarbazole)

✍ Scribed by M.C. González; F. Zamora; L.M. León; G.M. Guzmán

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
247 KB
Volume
18
Category
Article
ISSN
0014-3057

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✦ Synopsis

The methods of isothermal and dynamic thermogravimetry have been used to study the degradation of poly(N-vinylcarbazole) (PNVC). The multiple heating rate method has been used. as a dynamic method, to obtain kinetic parameters. A linear relationship between the activation energy. E. and M,71 (~,,, being weight average molecular weight) was found. From isothermal experiments, a temperature was found for which E was independent of molecular weight. We could then refer to a degradation characteristic-temperature of the polymer. On the other hand. altering the heating rate leads to changes in the values of E for each molecular weight indicating two kinds of scission: one occurs in the backbone, producing mainly monomer: in the other, both side-group and backbone scissions occur producing different products.

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