Sb/Ti复配催化半光聚酯热降解动力学研究

通过热失重(TGA)、Friedman方法、Chang方法系统研究了5种Sb/Ti复配催化剂(Sb/Ti配比分别为:100/0、75/25、50/50、25/75、0/100)合成半光聚酯PET(聚对苯二甲酸乙二醇酯)于氮气气氛下的热稳定性能及热降解动力学。热失重研究表明:失重1%时全钛聚酯失重温度比全锑的高,其他复配比例聚酯的失重温度处于二者之间;失重5%~50%时的失重温度,复配的均与锑相当,全钛的最低;通过Friedman法和Chang法求得热降解动力学参数:分解反应活化能E和反应级数n,结果表明,随着Sb/Ti复配催化剂中Ti比例的升高,E和n均呈下降趋势,聚酯的热稳定性下降。

Thermal degradation kinetics of semi-dulling polyester chips with Sb/Ti catalyst

The thermal degradation kinetics of semi - dulling polyester chips was studied systematically through the methods of TGA, Friedman and Chang under nitrogen atmosphere ( with five different compound cata-lysts matching ratios:Sb/Ti=100/0 , 75/25 , 50/50 , 25/75 and 0/100 ) . The results of TGA showed that the de-composition temperature of Ti-catalyst polyester was higher than that of Sb-catalyst polyester at weightlessness 1%, and other polyester’ s decomposition temperatures were in the temperature range between Ti-catalyst polyes-ter’s and Sb-catalyst polyester’s. And the decomposition temperature of Ti-catalyst polyester was the lowest one at weightlessness 5% ~50%, other polyester’ s temperatures were all approaching the decomposition temperature of Sb-catalyst polyester’ s temperature. The results of thermal degradation kinetic suggested that the decomposition reaction series n, decomposition activation energy E all manifest their declining trend with Ti’ s proportion increas-ing, which mean the thermal stability of the polyester declines.