A Kinetic Study on the De-Crosslinking and Decomposition of Silane-Cross-Linked Polyethylene in Supercritical Methanol
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- 作者：Giyoung Hong ; Soon Man Hong ; Chong Min Koo ; Bum Ki Baek ; Hong-shik Lee ; Youn-Woo Lee
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2015
- 出版时间：December 9, 2015
- 年：2015
- 卷：54
- 期：48
- 页码：11961-11965
- 全文大小：238K
- ISSN：1520-5045
文摘
De-crosslinking of silane-cross-linked polyethylene (S-XLPE) in supercritical methanol was investigated. Changes in gel content and molecular weight with reaction temperature and reaction time were analyzed in a batch reactor, and kinetic parameters were calculated from the experimental data. The reaction time for de-crosslinking shortened as the reaction temperature increased and the complete de-crosslinking of S-XLPE was achieved at 320 掳C and 20 min. The de-crosslinking rate of S-XLPE fit well with the first order reaction model. In addition, the molecular weight of de-cross-linked polyethylene (DXPE) decreased further as reaction temperature and reaction time increased when the reaction temperature exceeded 360 掳C relative to that of the original polyethylene before being cross-linked. The decreasing molecular weight trend also fit well with the first order reaction model.