Kinetic analysis of the thermooxidative degradation of poly(vinyl-chloride) in poly(vinyl chloride)/methyl methacrylate―butadiene―styrene blends 2. Nonisothermal degradation

摘要

The thermooxidative degradation of poly(vinyl chloride)/(methyl methacrylate-butadiene-styrene) (PVC/MBS) blends was investigated by nonisothermal thermogravimetry in air. Measurements were carried out in the temperature range of 50―650℃. The kinetic parameters (E_a and A) of the first degradation step were determined by applying the Flynn―Wall―Ozawa method. Their relationship through a compensation effect was discussed and an apparent compensation effect was found. The addition of MBS changes the rate of PVC dehydrochlorination in the blends, while in the blends with 15 and higher MBS ratio, the reaction scheme of degradation also changes.