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以蚕丝断裂强力作为蚕丝织物酸水解老化样品老化程度的考核指标,利用衰减全反射傅里叶变换红外光谱(ATR-FTIR)技术和红外光谱去卷积拟合技术考察样品丝蛋白一级、二级结构的变化,分析丝蛋白β-折叠结构变化对蚕丝织物断裂强力的影响,同时利用X射线衍射(XRD)技术测试分析样品丝蛋白结晶度变化,以此探讨蚕丝织物的老化规律及老化机制。结果表明,随着蚕丝织物酸水解老化处理时间延长和氢离子浓度增加,丝蛋白的β-折叠结构相对含量呈下降趋势,而蚕丝织物断裂强力随老化处理时间的变化规律与丝蛋白β-折叠结构相对含量的变化有一致性。进一步分析蚕丝织物断裂强力变化曲线区域特性,发现丝蛋白β-折叠结构相对含量的变化是引起蚕丝织物断裂强力变化的主要原因,并且对样品丝蛋白结晶度的测试结果佐证了上述观点。
The strength of silk breaking was taken as the assessment index of the aging degree of acid hydrolyzed aging samples of silk fabrics. The silk fibroin was first and secondarily degraded by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and Fourier transform infrared (FTIR) The changes of β-sheet structure of silk fibroin were analyzed. The influence of the change of β-sheet structure on the breaking strength of silk fabric was analyzed. The change of crystallinity of silk fibroin was analyzed by X-ray diffraction (XRD), and the aging rules and aging mechanism of silk fabric . The results showed that the relative content of β-sheet structure of silk fibroin decreased with the prolongation of acid hydrolysis and aging treatment and the increase of hydrogen ion concentration. However, the breaking strength of silk fabric changed with aging time and β-sheet of silk fibroin Changes in the relative content of structure consistency. Further analysis of the regional characteristics of silk fabric breaking strength curve found that changes in the relative content of silk fibroin β-sheet structure is the main cause of silk fabric breaking strength changes, and the test results of the sample silk protein crystallinity corroborate the above point of view.