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Crosslinking structure of keratin: III. Rubberlike elasticity originating from non‐uniform structures of the swollen hair and wool fibers
Author(s) -
Arai Kozo,
Ma Guanghui,
Hirata Taishi
Publication year - 1991
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.1991.070420426
Subject(s) - materials science , composite material , wool , rubber elasticity , elasticity (physics) , keratin , swelling , polymer chemistry , natural rubber , medicine , pathology
Hair and wool fibers treated with an 11 M LiBr solution containing N ‐ethylmaleimide showed typical rubberlike elasticity in a solution composed of equal volumes of 8 M LiBr and diethylene glycol monobutyl ether. Stress–strain relations of the swollen fibers were treated with a two‐phase structural model: a mechanically stable phase of higher crosslinked domains and a rubbery phase with lower crosslink density. Stress–strain curves were analyzed by applying non‐Gaussian chain statistics to the swollen keratin network, including microdomains, which act as reinforcing filler particles in rubber. Swollen hair showed about 2.3 times higher modulus than wool. It has been suggested that: (1) the difference in the modulus between the two keratins is attributable to the difference in the volume fraction of domains, and (2) the crosslink density of rubbery phase in hair is virtually identical to that in wool.