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Crystallization and the mechanical and rheological properties of decrosslinked–crosslinked‐high‐density polyethylenes using a supercritical fluid
Author(s) -
Cho HangKyu,
Hong Soon Man,
Koo Chong Min
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33386
Subject(s) - crystallinity , supercritical fluid , materials science , crystallization , dynamic mechanical analysis , rheology , crystallization of polymers , rheometry , polymer , dynamic modulus , chemical engineering , composite material , polymer chemistry , chemistry , organic chemistry , engineering
The crystallization, and mechanical and rheological properties of decrosslinked–crosslinked‐high‐density polyethylenes using supercritical methanol were investigated by DSC, WAXS, DMTA, and UDS. Crosslinked high‐density polyethylenes were successfully decrosslinked in a supercritical methanol condition. The residual gel content of the decrosslinked samples decreased with the reaction temperature. The crystallization behavior, mechanical, and rheological properties of the decrosslinked samples were influenced considerably by the gel content. As the gel content increased, the network gel structure restricted the chain mobility of polymer molecules in the melt state and hindered their crystallization. Thus, the nonterminal yield behavior in the melt state was enhanced and the crystallinity decreased. The dynamic elastic modulus of the decrosslinked sample in solid state increased with the increase in the crystallinity. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011