Abstract
The thermal properties of Bombyx mori silk fibers subjected to heat-treatment were examined by thermogravimetry-differential thermal analysis-Fourier transform infrared absorption spectrometry (TG-DTA-FTIR). Only 1% of the original silk fiber weight remains as cocoon ash after treatment at 550 °C. Inorganic components, such as calcium, potassium, sulfur, magnesium etc., were detected in the cocoon ash by energy dispersion fluorescent X-ray spectrometry. A sharp decrease in weight was observed in the TG data to begin around 280 °C, and an endothermic peak appears at 308 °C as evidenced by DTA curves. The IR bands observed at 2380 cm-1, 1760 cm-1, 1503, 1085 cm-1 and 965 cm-1 become stronger as an exothermic reaction beginning at 280 °C takes place. This is probably due to cleavage of the main chain and the accompanying decomposition of the silk fibers.
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