Thermokinetic Studies in the Polycarbosilane–Oligosilazane–Rolivsan System


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Abstract

Curing and pyrolysis of ceramic-forming systems based on polycarbosilane, oligovinylsilazane, and Rolivsan® were studied by differential scanning calorimetry, thermal gravimetric analysis, and IR spectroscopy. Mechanisms of three-step curing were suggested. The kinetics of curing, occurring without weight changes, was described assuming that the conversion rate is proportional to the thermal flux. In the case of pyrolysis accompanied by the weight loss, the conversion rate was assumed to be proportional to the weight loss rate. Based on the kinetic models obtained, heat treatment conditions were suggested to ensure uniform progress of curing and pyrolysis.

About the authors

A. M. Shestakov

All-Russia Research Institute of Aviation Materials

Email: khaskovma@viam.ru
Russian Federation, Moscow, 105005

S. D. Sinyakov

All-Russia Research Institute of Aviation Materials

Email: khaskovma@viam.ru
Russian Federation, Moscow, 105005

O. Yu. Sorokin

All-Russia Research Institute of Aviation Materials

Email: khaskovma@viam.ru
Russian Federation, Moscow, 105005

M. A. Khaskov

All-Russia Research Institute of Aviation Materials

Author for correspondence.
Email: khaskovma@viam.ru
Russian Federation, Moscow, 105005

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