Abstract
The technique of determining relative melting temperatures from thermal contraction data has been applied to crosslinked keratin fibres. The introduction of additional crosslinks by formaldehyde results in an increased thermal stability but only for certain conditions of treatment. No change of thermal stability is observed following the introduction of crosslinks by other treatments, but the reduction of water content increases the thermal stability in water. It is suggested that the crosslinks affecting thermal stability are those closely associated with the helical structure of keratin and this is achieved by formaldehyde treatments in which formaldehyde is in a monomeric or monohydrate form. Formaldehyde treatment fully restores the loss of thermal stability of partially reduced wool, an effect not achieved by other crosslinking treatments.
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