Decrosslinking reaction kinetics of silane-crosslinked polyethylene in sub- and supercritical fluids

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• 作者：Bum Ki Baek^a ; ^b ; ¹ ; Yun Ho La^a ; ^c ; ¹ ; Albert S. Lee^a ; Haksoo Han^b ; Seong Hun Kim^c ; Soon Man Hong^a ; ^d ; Chong Min Koo^a ; ^d ; ^{koo@kist.re.kr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Silane-crosslinked polyethylene ; Supercritical fluids ; Decrosslinking ; Continuous process ; Kinetics ; Recycling
• 刊名：Polymer Degradation and Stability
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：130
• 期：Complete
• 页码：103-108
• 全文大小：1027 K

文摘

Supercritical methanol is a popular fluid as a supercritical medium for decrosslinking reaction of crosslinked polyethylene. However, due to its toxicity, a safe alternative medium is much to be desired. In this work, various sub- and supercritical fluids with different polarity characters were investigated to find a safe alternative medium for continuous decrosslinking of silane-crosslinked polyethylene (S-XLPE). Like methanol, all examined fluids, including ethanol, propanol, and water, exhibited first-order reaction kinetics regarding the gel content in the continuous decrosslinking process. The reaction rate constant values were observed as 2.806, 2.569, 2.383, and 2.130 min⁻¹ in supercritical methanol, supercritical ethanol, supercritical 2-propanol, and subcritical water at 380 °C, respectively. As a non-toxic fluid with reaction kinetics very comparable to that of methanol, ethanol was found to be the best alternative medium for the continuous decrosslinking reaction of S-XLPE.