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Crystallinity in silk fibers: Partial acid hydrolysis and related studies
Author(s) -
Bhat N. V.,
Nadiger G. S.
Publication year - 1980
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.1980.070250518
Subject(s) - crystallinity , fibroin , silk , hydrolysis , hydrolysate , amorphous solid , crystallite , recrystallization (geology) , materials science , chemical engineering , dissolution , nuclear chemistry , chemistry , composite material , crystallography , organic chemistry , biology , paleontology , engineering
Four Indian varieties of silk viz., Mulberry, Tasar, Eri, and Muga, have been investigated by x‐ray diffraction and infrared spectroscopy. The hydrolysis for Mulberry was carried out using 6 N HCI at 40°C, whereas the other wild varieties of silk were hydrolyzed partially using 8 N HCI at 40°C. The x‐ray order factor, IR crystallinity index, and crystallite size have been determined for control, 48‐hr hydrolysates, and (48 + 48)‐hr hydrolysates. The lateral order improvement need not be associated with selective dissolution of amorphous region. This was further varified by short duration hydrolysis. A sort of recrystallization process could be attributed to order improvement. The results are discussed to understand the fine structure of the crystalline region of the fibroin.