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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >INVESTIGATION OF CATALYTIC GLYCOLYSIS OF POLYETHYLENE TEREPHTHALATE BY DIFFERENTIAL SCANNING CALORIMETRY
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INVESTIGATION OF CATALYTIC GLYCOLYSIS OF POLYETHYLENE TEREPHTHALATE BY DIFFERENTIAL SCANNING CALORIMETRY

机译：差示扫描量热法研究聚对苯二甲酸乙二酯的催化水解反应

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The glycolysis of polyethylene terephthalate resin with excess amount of ethylene glycol, using metal acetates as catalysts, was examined by differential scanning calorimetry (DSC). The experiments were carried out under a nitrogen atmosphere of 600 psi. The efficiency of glycolysis was measured from the peak temperature associated with reaction endotherm. Among all the catalysts studied zinc acetate was confirmed to be the most effective for glycolysis. The glycolyzed products were mainly composed of small oligomers of bis-hydroxyethyl terephthalate in the presence of zinc acetate. Two isoconversion methods of kinetic analysis were applied for estimating the activation energy of glycolysis. The activation energy was lowered either by adding zinc acetate or by decreasing resin size. The results suggest that the depolymerization or the removal of polymer molecules from solid matrix should be the rate-limiting step of polyethylene terephthalate (PET) glycolysis, and that zinc acetate might facilitate the bond scission of polymer chains. (C) 1997 Elsevier Science B.V. [References: 23]
机译：通过差示扫描量热法（DSC）检查了使用金属乙酸盐作为催化剂的聚对苯二甲酸乙二醇酯树脂与过量的乙二醇的糖酵解。实验在600psi的氮气气氛下进行。从与反应吸热相关的峰值温度测量糖酵解效率。在所有研究的催化剂中，乙酸锌被证实对糖酵解最有效。在乙酸锌存在下，糖化产物主要由对苯二甲酸双羟乙酯的小的低聚物组成。动力学分析的两种同等转化方法用于估计糖酵解的活化能。通过添加乙酸锌或减小树脂尺寸来降低活化能。结果表明，解聚或从固体基质中去除聚合物分子应该是聚对苯二甲酸乙二酯（PET）糖酵解的限速步骤，并且乙酸锌可能促进聚合物链的键断裂。 （C）1997 Elsevier Science B.V. [参考：23]

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