Mechanical Properties and Structure of Alpha-keratin Fibres: Wool, Human Hair and Related Fibres
The mechanical properties of wool, hair and other alpha-keratin fibres represent the most important physical properties for which these fibres are used, whether this be in the manufacture of textile garments, reshaping human hair, or in the alignment of fibres in paint brushes.
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THE RELATION BETWEEN THE MECHANICAL PROPERTIES
MECHANICAL PROPERTIES OF WOOL FIBRES
TRANSIENT MECHANICAL EFFECTS IN 0KERATIN FIBRES
SET RECOVERY SUPERCONTRACTION
The proteins in the cortex of Cēkeratin
a-helical structure a-helices a-keratin fibres absorption aqueous bond breakdown Burte-Halsey chemical cohesive set component corresponds Corriedale wool fibres cortex cortical cells Coulombic interactions covalent bonds cross-links crystalline curve cystine diametral swelling distilled water distortion disulfide bonds environment Feughelman fibre direction fibre in water Figure fixed extension fixed strain force of retraction formed formic acid globular proteins hair fibres helical high sulfur protein Hookean region human hair hydrogen bonds hydrophobic hygrostress increase indicated initial keratin structure keratin-water length lithium bromide longitudinal material matrix protein measurements mechanical behaviour mechanical equilibrium mechanical properties microfibrils mobility moisture content o-helical occurs polymer polypeptide chains post-Yield region range reduced relationship relative humidity relaxation release residues room temperature setting strain stiffness strain levels stress stress-relaxation stress-strain sulfhydril groups Textile Res thiol transition temperature twist two-phase model unfolding water at 20°C water content water molecules wet fibre Yield region Young's modulus zones