Abstract
An isotactic polypropylene (iPP) sample (100% by FTIR) has been thermooxidized in the temperature range 80−170 °C and the kinetics of the degradation followed by measuring the chemiluminescence intensity along the induction and autoacceleration stages. From those curves, the parameter p0, related to the initial concentration of oxidizable sites, has been calculated and compared to previous results on other PP of different tacticity. A relationship between the relaxations and/or phase transitions taking place in the temperature range under study and the temperature dependence of parameter p0 in the four samples of fully or predominantly i-PP has been found. It is proposed that the discontinuities in the rate of release of interchain interactions caused by these phase transitions or relaxations are responsible for the slope of the temperature dependence of log p0. Polymers bearing α-relaxation show a strong decrease in p0 at temperatures under 115 °C which is absent in polypropylene samples where the α-rela...
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