Investigation of thermal polycyclocon‐densation of polyhydrazides

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Abstract
This paper presents the results of investigations on thermal polycyclocondensation of polyhydrazides to corresponding poly‐1,3,4‐oxadiazoles. A limiting character of conversion is associated with the mobility of polymeric chains due to the fact that they become rigid by conversion of linear hydrazide fragments into cyclic 1,3,4‐oxadiazole ones, as well as to an increasing content of the latter in the course of conversion. Hence, the kinetics of the solid‐phase polycyclization of polyhydrazides is determined not only by the reactivity of groups participating in cyclization, but also by some factors indicating the effect of the structure on the starting polymeric compound and that of the structure order.

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