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Keratin sponge/hydrogel: 1. fabrication and characterization

Permanent URL:
http://handle.nal.usda.gov/10113/59487
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Abstract:
Keratin sponge/hydrogels formed by oxidation and reduction hydrolysis of US domestic fine- or coarse-grade wool exhibited distinctively different topologies, each with unique porous structure. These materials retained amino acids and microstructure as protein homologues of intact keratin. Amphoteric character was confirmed by differential dyeing with anionic and cationic dyes. Differential scanning calorimetry (DSC) provided evidence of molecular organization and the behavior of occluded moisture through measurements of glass transition, peak temperature, thermal degradation temperature, enthalpy of water removal, and degradation (Tg, Tw, Hw, Tt, and Ht). The absence of denaturation peaks indicated highly crosslinked molecular association. Low Hw indicated high plasticity and the ability to absorb and retain moisture. Small amplitude strain analysis rheology to measure storage or elastic modulus, G0, and shear loss or viscous modulus, G00, as a function of applied strain characterized the sponge/hydrogels as covalently crosslinked networks. With viscoelastic properties typical of both liquids and solids, they maintained their structural integrity under strain.
Author(s):
Jeanette M. Cardamone , Michael H. Tunick , Charles Onwulata
Note:
USDA Scientist Submission
Source:
Textile Research Journal 2013 1 1 v.83 no.7
Language:
English
Year:
2013
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.