Elastomers Based on Nitrile Butadiene Rubber Stabilized with N-Aryl-substituted Camphan-2 and Fenchan-2-amines

Abstract

For the first time, it was proposed to use aniline derivatives with a skeleton monoterpene fragment at the nitrogen atom (N-(het)aryl-substituted camphan-2-amines and N-aryl-substituted fenchan-2-amines) as antioxidants for rubbers. Using nitrile butadiene rubber as an example, the kinetics of accumulation of carbonyl groups in macromolecules was studied using IR spectroscopy and the potential ability of these compounds to inhibit the process of thermal-oxidative aging was revealed. N-[(1RS,2RS)-Camphan-2-yl]-4-methoxyaniline and N-[(1RS,2RS)-camphan-2-yl]-4-ethoxyaniline, which differ in the presence of polar ethoxy and methoxy substituents at the p-position at aniline and characterized by the lowest bond energy >N–H. The results of a comprehensive assessment of the retention of elastic-strength properties, hardness, and degree of cross-linking of samples after thermal-oxidative aging in laboratory conditions, as well as long-term full-scale climatic tests in the tropical climate of southern Vietnam, allow us to conclude that after additional testing these compounds can be used as antioxidants in rubber formulations.