TY - JOUR
T1 - Decrosslinking reaction kinetics of silane-crosslinked polyethylene in sub- and supercritical fluids
AU - Baek, Bum Ki
AU - La, Yun Ho
AU - Lee, Albert S.
AU - Han, Haksoo
AU - Kim, Seong Hun
AU - Hong, Soon Man
AU - Koo, Chong Min
N1 - Funding Information:
This study was supported by R&D Center for Valuable Recycling (Global-Top R&BD Program) of the 1) Ministry of Environment (Project No. GT-11-C-01-240-0 ) and by grants from the Fundamental R&D Program for Core Technology of Materials and the Industrial Strategic Technology Development Program funded by 2) Ministry of Knowledge Economy , Republic of Korea. The authors also appreciate a grant from Materials Architecturing Research Center of 3) Korea Institute of Science and Technology (KIST).
Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - 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.
AB - 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.
KW - Continuous process
KW - Decrosslinking
KW - Kinetics
KW - Recycling
KW - Silane-crosslinked polyethylene
KW - Supercritical fluids
UR - http://www.scopus.com/inward/record.url?scp=84974806684&partnerID=8YFLogxK
U2 - 10.1016/j.polymdegradstab.2016.05.025
DO - 10.1016/j.polymdegradstab.2016.05.025
M3 - Article
AN - SCOPUS:84974806684
SN - 0141-3910
VL - 130
SP - 103
EP - 108
JO - Polymer Degradation and Stability
JF - Polymer Degradation and Stability
ER -