The effect of polymerization catalysts on the rate of degradation of isotactic polypropylene

Abstract

One of the reasons for purification of low‐pressure polymerization products is the assumed degradation effects of retained catalysts. Degree of degradation was determined from the change in viscosity number. Effects of catalysts on active sights and deactivation were noted along with degradation in the presence of air and oxygen in addition to determining, the effect of antioxidants. Individual components of the catalyst may have the ability to intensify the effect of any antioxidant and affect the rate of degradation where catalyst influence was better defined in the presence of oxygen.

Heterophase mechanisms of thermal oxidation of polymers. New horizons

“…This accounts for the accelerated accumulation of acids observed at high levels of polyolefin oxidation, despite the substantial decrease in the concentration of POOH after the [POOH] max has been attained. 48,49 It should be noted that the consumption of POOH, which accelerates with time, does not influence the invariant rate u 3 of the third macrokinetic stage of autooxidation; this indicates that the yield of radicals in the catalysed reaction is negligibly low.…”