Abstract
The application of differential thermal analysis as a tool for the identification and characterization of structural features in fibrous proteins has been studied. The influence of experimental variables is considered, and the effects of such factors as sample preparation and atmosphere control on the resultant differential thermographs have been examined. Some of the differences between, and possible assignments for, the differential thermograph peaks, particularly of keratin fibres, are considered. With these fibres, a doublet is found in the 200° to 250°C region, and it is suggested that this may be related to the melting of the α-keratin associated with the p- and o-cortical structures, respectively. Evidence is presented for a glass transition at about 165°C in the amorphous regions of keratin fibres. The detection and characterization of polyamide finishes on wool is demonstrated.
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