Melt polycondensation has recently been reported to prepare high‐viscosity poly(ethylene terephthalate) (PET), the reaction efficiency is greatly improved in over 10‐folds compared with conventional solid state polycondensation (SSP). Melt postpolycondensation of common PET chips was conducted in specified film thickness to obtain industrial PET. Based on the investigation of reaction conditions, film reaction kinetics were determined in the principle of end groups analysis. It was positively regulated that the intrinsic viscosity of PET could be achieved in condition of high vacuum, thin melt film and proper temperature, degradation reaction would be increased at exorbitant temperature. An apparent reaction kinetic model was proposed and was verified by experiments. Results indicated the activation energy of melt postpolycondensation of PET was 88.22 kJ/mol and the reaction rate constant was significant higher than that of solid state polycondensation.

中文翻译：

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聚对苯二甲酸乙二醇酯熔融后缩聚的薄膜反应动力学

最近有报道称，熔融缩聚可以制备高粘度的聚对苯二甲酸乙二醇酯（PET），与传统的固态缩聚（SSP）相比，反应效率大大提高了十倍以上。以规定的膜厚进行普通PET切片的熔融后缩聚以获得工业PET。在研究反应条件的基础上，根据端基分析的原理确定了膜反应动力学。积极调节在高真空，熔体薄膜和适当温度下可以达到PET的特性粘度，过高的温度下降解反应会增加。提出了表观反应动力学模型，并通过实验验证。