The effect of the conformational rigidity on the initial decomposition temperature of some heterocyclic polyimides has been investigated. Calculations by the Monte Carlo method were used for conformational analysis of these polymers. It was shown that there is a linear dependence of the initial decomposition temperature on the conformational parameters of a set of the polyimides containing a 1, 4-dithiine or thiofene fragment and poly(ether-bismaleimide)s containing ester or parabanic rings. It was also shown that partial cyclization of the parabanic rings occurs in the polyimides containing a 1, 4-dithiine or thiofene fragment.
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