Effect of Solvents on De-Cross-Linking of Cross-Linked Polyethylene under Subcritical and Supercritical Conditions

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• 作者：Hong-shik Lee ; Ju Hyeong Jeong ; Giyoung Hong ; Hang-Kyu Cho ; Bum Ki Baek ; Chong Min Koo ; Soon Man Hong ; Jaehoon Kim ; Youn-Woo Lee
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：May 22, 2013
• 年：2013
• 卷：52
• 期：20
• 页码：6633-6638
• 全文大小：312K
• 年卷期：v.52,no.20(May 22, 2013)
• ISSN：1520-5045

文摘

The effect of various solvents on the de-cross-linking reaction of cross-linked polyethylene under subcritical and supercritical conditions was studied. The gel content of the de-cross-linked polyethylene decreased from 60 to 0.8鈥?.5% at 380 掳C within 5 min in all of the solvents tested in this study. When water, ethanol, and 2-propanol were used, the M_w of the de-cross-linked polyethylenes decreased from 349,000 to 200,000鈥?27,000 g/mol, and much lower M_w values of 70,000鈥?0,000 g/mol were observed when acetone and diisopropyl ether were used. The de-cross-linked polyethylenes treated in the different solvents had a very similar chemical structure to raw polyethylene. According to a kinetic study using a first-order reaction model, the de-cross-linking rate in each solvent increased in the order 2-propanol < ethanol < n-hexane < water < methanol diisopropyl ether acetone at 350 掳C.