ISSN:
0025-116X
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
The thermal decomposition of poly(1,6-bis(N-carbazolyl)-2,4-hexadiyne) crystals, prepared by gamma radiation, was examined over a range of experimental conditions, the most important of which are temperature and crystal size. The only two significant products found were carbazole and to a lesser extent 9-methylcarbazole. Decomposition kinetics, which applied to the two observed autoacceleratory regions, was best fitted to an Avrami-Erofeyev equation with an exponent of two. The activation energy determined for the first autoacceleratory region was found to be higher than that determined for the second autoacceleratory region. A reaction mechanism is described based on stressinduced initiation, followed by either a molecular or a free-radical non-chain process. In an attempt to release stress, the polymer was observed to undergo sidegroup cleavage due to shearing of neighbouring polymer chains.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/macp.1992.021930211
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