Evaluation of some antioxidants in radiation vulcanized ethylene-propylene diene (EPDM) rubber

Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) have been used to study the oxidation of gamma -ray vulcanized ethylene-propylene diene rubber (EPDM) stabilized with various types of antioxidants. The antioxidants used were pentaerythrityl tetrakis(3,5-di-tert-butyl(-4-hydroxyphenyl))propionate (Irganox 1010). Irganox 1035, Irganox 1520D. as primary antioxidants: Irganox B561 and Irganox B900, as synergistic blends; hindered amine light stabilizer (HALS). i.e. Tinuvin 622 LD: N-isopropyl-N-phenyl-p-phenylene diamine (IPPD) and trimethyl quinoline (TMQ) and their mixtures. The measurements were carried out under atmospheric conditions, The effects of antioxidant type and its selected concentration were determined and mechanism of reaction proposed. (C) 2001 Elsevier Science B.V. All rights reserved.