Thermooxidation of lactam-based polyamides with amino end- groups. Thermooxidation of hexano-6-lactam and decomposition of 6-hydroperoxyhexano-6-lactam in the presence of primary amines'

摘要

Oxygen consumption, reaction products and chemiluminescence in the course of the thermooxidation of hexano-6-lactam melt in the presence of primary amines as well as thermooxidation of lactam-based polyamides with amino end-groups were studied. Amines induce the homolysis of amide hydroperoxides, primary products of the chain oxidation of lactams, and react with alde- hydes originating from hydroperoxide homolysis. By condensation of amines with aldehydes, aldimines are produced together with singlet oxygen, the initiator of N-alkylamide oxidation. In polylactams prepared by hydrolytic polymerization, the carboxylic and amino end-groups are associated and their effect on polymer thermooxidation is thus suppressed.