【摘要】 废旧聚酯纺织品经乙二醇(EG)醇解、与1,4-丁二醇(BDO)酯交换后得到对苯二甲酸双羟基丁二醇酯(BHBT),再与碳酸二甲酯(DMC)和BDO酯交换制备的双甲基碳酸丁二醇酯(BMBC)缩聚制备出再生基聚对苯二甲酸丁二醇酯-co-碳酸丁二醇酯(r-PBCT)共聚酯。在高纯氮气的气氛下，采用不同的升温速率对r-PBCT的热降解动力学进行研究，并与聚碳酸丁二醇酯(PBC)进行对比研究。利用Kissinger、Flynn-Wall-Ozawa及Friedman 3种方法分别计算了其热降解表观活化能。结果表明：PBC为一步降解行为；r-PBCT为两步热降解行为，随着BT链段含量的增加，活化能逐渐增加，热稳定性不断增强。利用Coast-Redfern法研究了PBC和r-PBCT的热降解反应动力学机理，其中，PBC的热降解反应级数为0.5;r-PBCT遵循一维扩散反应机理，反应级数为2.0。更多还原

【Abstract】 Post-consumer polyester textiles were alcoholized and transesterified to prepare bis(2-hydroxybutyl) terephthalate(BHBT) without any purification. Subsequently, it was polycondensed with bis(2-methyl) butylene carbonate(BMBC) which was synthesized by dimethyl carbonate(DMC) and 1,4-butanediol(BDO) to prepare regenerated poly(terephthalate-co-butylene carbonate) copolyester(r-PBCT) copolyesters. The thermal degradation kinetics of PBC and r-PBCT were studied by the thermogravimetric method under high-purity nitrogen. And the activation energy was calculated by Kissinger’s method, Flynn-Wall-Ozawa’s method and Friedman’s method, respectively. The results show that the thermal degradation behavior of PBC is evidenced by one-step thermal degradation profile and r-PBCT is evidenced by two-step thermal degradation profile. The activation energy and the reaction order tend to increase with an increasing BT content, and the thermal stability is also enhanced constantly. The kinetic mechanism of PBC and r-PBCT was studied by Coast-Redfern method. Among them, the thermal degredation reaction order of PBC is 0.5. r-PBCT follows the one-dimensional diffusion reaction mechanism and its thermal degradation reaction order is 2.0.更多还原