Effect of Solvents on De-Cross-Linking of Cross-Linked Polyethylene under Subcritical and Supercritical Conditions
- Effect of Solvents on De-Cross-Linking of Cross-Linked Polyethylene under Subcritical and Supercritical Conditions
- 이홍식; 정주형; 홍기영; 조항규; 백범기; 구종민; 홍순만; 김재훈; 이윤우
- Issue Date
- Industrial & engineering chemistry research
- VOL 52, NO 20, 6633-6638
- 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 0.8–2.5% at 380 °C within 5 min in all of the solvents tested in this study. When water, ethanol, and 2-propanol were used, the Mw of the de-cross-linked polyethylenes decreased from 349,000 to 200,000–227,000 g/mol, and much lower Mw values of 70,000–90,000 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 °C.
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