摘要
研究不同冷冻温度处理后桑蚕丝纤维的表观形态及内部结构的变化情况。采用低温冷冻设备对普通脱胶桑蚕丝进行-10℃^-86℃冷冻处理,测试了不同冷冻温度下桑蚕丝纤维的外观形态、红外光谱图、X射线衍射图谱、热学性能、直径和体积质量。研究结果表明:冷冻处理后,在桑蚕丝纤维表面会出现局部孔洞、裂隙结构现象,且冷冻温度越低,这种结构变化越明显;丝蛋白中的无规线团结构及α-螺旋结构有向更稳定结构转变的趋势,且结晶结构向更规整的SilkⅡ型结构转化,蚕丝的热稳定性改善,最大吸热分解温度提高2℃以上,对应的分解焓值提高5 J/g以上,而冷冻后纤维在直径及体积质量方面的变化并不明显。认为:冷冻处理可用于桑蚕丝纤维的改性。
Superficial morphology and internal structure change of mulberry silk after freezing treatment in different temperature were researched. -10℃～-86℃ freezing treatment of normal degummed mulberry silk was performed using low temperature freezing device. Appearance, infrared spectrum, X-ray diffraction spectrogram, thermal property, diameter and volume mass of mulberry silk fiber after freezing treatment in different temperature were tested. The result shows that partially holes and crack structure phenomenon are shown up on the surface of mulberry silk fibers after freezing treatment. As the decreasing of freezing temperature, these structure changes become more obvious. More stable structureis transformed to for random coil structure and α-helical structure in silkfihroin. More order Silk II structure is turned to for crystalline structure. The thermal property of silk is improved. More than 2 ℃ are increased for the maximum endothermic decomposition temperature. More than 5 J/g corresponding decomposition enthalpy value are improved. However, the change of fiber diameter and volume mass after freezing is not very obvious. Therefore, it is considered that freezing treatment can be used for the modification of mulberry silk.
出处
《棉纺织技术》
CAS
北大核心
2014年第12期1-4,8,共5页
Cotton Textile Technology
关键词
桑蚕丝
冷冻处理
表观形态
微观结构
热学性能
纤维直径
体积质量
Mulberry Silk, Freezing Treatment, Superficial Morphology, Microstructure, Thermal Property, Fiber Diameter,Volume Mass
