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Studies on regenerated protein fibers. III. Production of regenerated silk fibroin fiber by the self‐dialyzing wet spinning method
Author(s) -
Matsumoto Kiyoichi,
Uejima Hiroyuki,
Iwasaki Tatsuo,
Sano Yoshiyuki,
Sumino Hiroshi
Publication year - 1996
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/(sici)1097-4628(19960425)60:4<503::aid-app3>3.0.co;2-s
Subject(s) - fibroin , silk , spinning , fiber , materials science , polymer science , sericin , synthetic fiber , composite material , microfiber , chemical engineering , polymer chemistry , engineering
The spinnable dope containing 20 wt % of silk fibroin dissolved in the MU solvent (e.g., LiBr · H 2 O = 40 wt %, and EtOH : H 2 O = 100 : 0 in volume) was spun into a coagulant and subsequently drawn, to give the following results. 1 Methanol, ethanol, and isopropanol were a predominant coagulant for the dope, and the coagulant containing 10% LiBr · H 2 O is best. 2 Spinnability depended upon the ratio of nozzle hole length to diameter ( L/D ) and was improved by increasing L/D from 4 to 10. Coagulativity was not sufficient at the SF concentration of 16%, but improved by raising it up to 20%. Drawability of the spun filaments in water was improved at a temperature above 60°C. 3 The drawn fiber showed excellent mechanical properties, especially tensile toughness when as‐spun fiber was drawn in water at 61°C. An X‐ray diffraction diagram of the drawn fibers indicated their crystalline axes were partially oriented along the fiber axis. © 1996 John Wiley & Sons, Inc.