Thermal antioxidation behavior of a new hindered phenol with branched structure for nitrile rubber

A new hindered phenol with branched structure (chemical formula: 2-(((3,5-ditert-butyl-4-hydroxybenzoyl)oxy)methyl)-2-ethylpropane-1,3-diyl bis(3,5-ditert-butyl-4-hydroxybenzoate)) was synthesized and characterized, and its thermo-oxidative stability as antioxidant into nitrile rubber (NBR) was assessed by the measurements of accelerated aging, with two antioxidants (AO-80 and AO-2246) as a comparison. By measuring and analyzing the oxidative induction temperature, oxidative induction time and dynamic mechanical properties of NBR with addition of 0.5 wt.% antioxidants, it is confirmed that new hindered phenol with branched structure could effectively inhibit the oxidation degradation of NBR.