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Multiple‐step drawing innovative ultrahigh‐molecular‐weight polyethylene fibers modified with bacterial cellulose and scCO 2 ‐aid
Author(s) -
Xiang Yu,
Tu Zhongdan,
Lei Ting,
Zhang Jiaxin,
Yeh Jentaut
Publication year - 2021
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.50744
Subject(s) - materials science , composite material , polyethylene , fiber , supercritical carbon dioxide , supercritical fluid , ultra high molecular weight polyethylene , cellulose , nanofiber , ultimate tensile strength , synthetic fiber , chemical engineering , chemistry , engineering , organic chemistry
Innovative supercritical carbon dioxide (scCO 2 )‐assisted ultrahigh‐molecular‐weight‐polyethylene (UHMWPE)/modified bacterial cellulose (MBC) as‐spun fibers were found to display substantially lower dynamic transition temperatures than those acquired for scCO 2 ‐assisted UHMWPE or UHMWPE/MBC as‐spun fibers prepared without scCO 2 ‐assistance or incorporation of MBC nanofibers. Multiple‐step drawing methods were first‐time applied to these finely ''relaxed'' scCO 2 ‐assisted UHMWPE/MBC fibers and considerably improved their achievable draw ratios ( D ra s), orientation factor ( f o s), and tensile tenacities ( σ tt s). The best five‐step drawn scCO 2 UHMWPE/MBC fiber displayed a particularly high σ tt of 135 g d −1 , which was ~35, ~3.75, and ~1.7 fold of σ tt s acquired for good steel fiber and the most appropriate single‐step drawn scCO 2 ‐assisted UHMWPE and UHMWPE/MBC fibers, respectively. The particularly high D ra s, f o , and σ tt s acquired for the best multiple‐step drawn scCO 2 ‐assisted UHMWPE/MBC fibers is ascribed to their more ''relaxed'' UHMWPE structures, thinner lamellae, and successive increased drawing temperature in the multiple‐step drawing processes.