桑蚕丝(B．mor)是由天然的蚕丝蛋白组成，并可以被光、热、水和微生物等损坏.对湿热工艺诱导桑蚕丝纤维的结构和性能的变化进行了测定，观察发现，在150℃条件下将相对湿度从0％增加到70％会降低其拉伸强度.在一个成熟的环境中引入水可以促进水解降解.丝氨酸和酪氨酸的浓度由于相对湿度增加而增加，这导致了黄度指数的增加.蚕丝纤维的结晶结构没有显示出任何明显的变化，除了产生了少量的结晶副产物.
Bombyx mori (B.mor)silk was composed of natural fibroin,and could be attacked by light,heat, water,and microorganisms,etc.The changes of the structure and properties of B.mori silk fiber induced by moist-heat treatment were determined.It was observed that as the relative humidity increase from 0% to 70%at 150 ℃ decrease its tensile strength.Introducing water to the ageing environment promoted hydrolytic degra-dation.The concentration for serine and tyrosine decreased significantly as the relative humidity increasing, which resulted in increasing in yellowness index.The crystalline structure of silk fiber did not show any signifi-cant change except processing a slightly crystallinity arising.
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