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Novel aliphatic polyketone fiber by a wet‐spinning method using aqueous composite metal salt solutions
Author(s) -
Morita Toru,
Taniguchi Ryu,
Matsuo Teruhiko,
Kato Jinichiro
Publication year - 2004
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.13562
Subject(s) - materials science , aqueous solution , coagulation , spinning , composite material , fiber , composite number , tenacity (mineralogy) , polymer , polymerization , protein filament , phase (matter) , polymer chemistry , chemical engineering , chemistry , organic chemistry , psychology , psychiatry , engineering
Poly(1‐oxotrimethylene), obtained by the perfectly alternating polymerization of ethylene and carbon monoxide, was successfully dissolved in composite metal salt solutions such as zinc chloride and calcium chloride aqueous solutions. Certain poly(1‐oxotrimethylene) solutions exhibited a phase‐separation point of 0°C or greater; the different phase‐separation temperatures depended on the metal salt composition ratio, the polymer molecular weight, and the polymer concentration. When a solution with a phase‐separation point was used for wet spinning, a coagulation temperature below the phase‐separation point resulted in gelation of the filament, which was caused by a temperature jump during the coagulation process; this yielded a coagulated filament with a dense and homogeneous cross‐sectional structure. The hot drawing of the coagulated fiber produced a high‐performance polyketone fiber with high strength and high elastic modulus [tenacity = 18.5 cN/dtex (2.4 GPa); elongation = 5%; elastic modulus = 450 cN/dtex (59 GPa)].With a solution that exhibited no phase‐separation temperature, coagulation proceeded as the coagulant penetrated from the fiber surface into the filament inside, yielding a coagulated filament with a skin–core structure. The maximum tenacity achieved with this skin–core coagulated filament was as low as 15 cN/dtex (1.9 GPa). © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1183–1189, 2004