ESR Study on Peroxide Modification of Polypropylene

Chemical modification of isotactic polypropylene via a free-radical mechanism was studied using an on-line electron spin resonance spectrometer. Peroxides were used to provide primary radicals upon thermal decomposition at elevated temperatures for the generation of polymer backbone radicals. Four types of peroxides, tert-butyl perbenzoate, dicumyl peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexyne-3, and benzoyl peroxide, at various …