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Physical properties and dyeability of NaOH‐treated silk fibers
Author(s) -
Freddi Giuliano,
Kato Hiroshi,
Tsukada Masuhiro,
Allara Giulia,
Shiozaki Hideki
Publication year - 1995
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.1995.070550313
Subject(s) - bombyx mori , silk , crystallinity , differential scanning calorimetry , materials science , antheraea pernyi , ultimate tensile strength , polymer chemistry , elongation , composite material , nuclear chemistry , chemistry , biochemistry , physics , gene , thermodynamics
Domestic ( Bombyx mori ) and wild (tussah, Antheraea pernyi ) silk fabrics were treated with diluted NaOH solutions by the pad/batch method. The equillbrium moisture regain of tussah silk fibers increased steadily with alkaline treatment, while that of B. mori did not change. B. mori tensile strenght and elongation at break were slightly impaired. The average molecular orientation and crystallinity of both kinds of silk remained unchanged. Differential scanning calorimetry (DSC) and thermomechanical analysis(TMA) showed that the thermal behavior of B. mori silk was almost unaffected, while that of tussah exhibited slight changes in the temperature range 250–300°C. By dynamic mechanical measurements (DMA) it was elucidated that both storage and loss moduli of B. mori silk fibers decreased following NaOH treatment. On the other hand, tussah silk exhibited a noticeable upward shift of the major loss peak. Alkali‐treated tussah silk fibers, dyed with an acid dyestuff, attained a lower degree of dye‐bath exhaustion. © 1995 John Wiley & Sons, Inc.