Abstract
Abstract The thermal, thermo-oxidative and thermohydrolytic stability of diphenylcarbodiimide, the cyclic dimer of diphenylcarbodiimide, hexaphenylisomelamine and hexaphenylmelamine, which model major fragments of network polymers based on oligo- and polycarbodiimides were studied over the 250–550° temperature range. Gaseous, liquid and solid products of the decomposition of these compounds were identified. It was established that under thermolysis conditions in a vacuum, the stabilities of the model compounds were almost the same, whilst hexaphenylmelamine displayed the highest stability towards thermo-oxidation and thermohydrolysis and diphenylcarbodiimide, the least. The results obtained permit recommendation of ways of performing directed crosslinking of linear polymers with carbodiimide groups in the chain, in order to obtain the most thermally stable systems.
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