Origin of the bimodal ?melting? endotherm of ?-form crystallites in wool keratin

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The melting endotherm of α-form crystallites in wool keratin appears often to be bimodal. The origin of the bimodal endotherm has been considered to correspond to the differential melting of the α-form crystallites in the domains of ortho- and para-cortical cells. An alternative interpretation is presented, in which the bimodal peak arises from the overlapping of the melting endotherm of α-form crystallites and the thermal degradation of other wool histological components. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 411–415, 1997