Abstract
Abstract A comparative study has been made by pyrolytic gas chromatography of the thermal stability of a number of aromatic and nitrogen containing polycyclic compounds modelling the units and individual fragments of the chain of heat resistant polymers. It is shown that introduction of various bridging groups between the benzene rings and reduction of the aromaticity of the cyclic systems bring about a decrease in thermal stability. It was found that the substances with greatest thermal stability are fully aromatic ring compounds and heterocyclic ring systems condensed with the benzene nucleus.
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