热重分析
差示扫描量热法
乙二醇
聚对苯二甲酸乙二醇酯
氢氧化钠
氢氧化钾
水解
氢氧化物
化学
碱性水解
解聚
核化学
高分子化学
聚乙二醇
乙烯
材料科学
无机化学
有机化学
催化作用
复合材料
物理
热力学
作者
Ching‐Yun Kao,Wood-Hi Cheng,Ben‐Zu Wan
标识
DOI:10.1002/(sici)1097-4628(19981205)70:10<1939::aid-app8>3.0.co;2-g
摘要
The hydrolytic depolymerization of polyethylene terephthalate (PET) with alkaline hydroxides was investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The reactions of the mixtures were conducted in their solid states under nitrogen atmosphere. The experimental results showed that potassium hydroxide possessed the hydrolytic activity of depolymerizing PET into small molecules such as ethylene glycol; in contrast, sodium hydroxide did not. The production rate of ethylene glycol was enhanced by increasing charge ratio of potassium hydroxide to PET. The presence of water facilitated the alkaline hydrolysis of PET; however, the presence of metal acetates decreased the hydrolysis rate. The activation energy for alkaline hydrolysis of PET determined by the thermograms was in good agreement with the value obtained from the experiments in a batch reactor. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1939–1945, 1998
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