不同盐甲酸溶解体系下丝素膜的制备及性能表征-丝绸.docVIP

研究与技术 不同盐/甲酸溶解体系下丝素膜的制备及性能表征 王 鹏1,2，左保齐1,2 (1. 苏州大学 纺织与服装工程学院，江苏 苏州 215021；2. 现代丝绸国家工程实验室，江苏 苏州 215123 摘要：采用盐/甲酸新型溶体系对丝素进行溶解成膜，探讨氯化钙溴化锂和溴化钙三种盐对丝素溶解再生丝素膜结构性能的影响，通过扫描电镜原子力显微镜流变、红外光谱、X射线衍射力学拉伸等测试技术表征再生丝素溶液及膜的结构与性能特征。结果在相同条件下，脱胶蚕丝可快速溶解于三种盐/甲酸溶剂中，氯化钙溶解丝素溶液的颜色为浅黄色，溴化锂，溴化钙为深黄色；溶解液颜色的变化与溶解后丝素纳米结构相对应，随颜色加深丝素纳米纤维的长度和直径下降，说明溶解程度逐渐加重。结构分析表明，该盐/甲酸溶体系制取的再生丝素膜以β折叠结构为主，盐种类不会对丝素结构产生明显影响。力学测试表明盐/甲酸体系获得的再生丝素膜具有良好的湿态力学强度和伸长，其中以氯化钙获得的膜性能最优。 关键词：氯化钙；溴化锂；溴化钙；丝素膜；纳米纤维结构 中图分类号：TS1 文献标志码：A 文章编号：1001-7003(2016)00-0000-00 收稿日期：2016-01-19；修回日期：2016-0-31 基金项目：国家自然科学基金资助项 作者简介：王鹏1991—)，男，硕士研究生，研究方向为丝蛋白生物材料。通信作者：左保齐，教授，bqzuo@suda.edu.cn。 Preparation and haracterization of the silk fibroin films in different salt/formic acid dissolution system WANG Peng 1,2, ZUO Baoqi1,2 (1. College of Textile and Clothing Engineering, Soochow University, Suzhou 215021, China; 2. National Engineering Laboratory for Modern Silk, Suzhou 215123, China) Abstract: In this paper, new salt/formic acid solvent systems are used to dissolve silk and prepare silk films in order to explore how calcium chloride(CaCl2), lithium bromide(LiBr) and calcium bromide(CaBr2) influence the structure and properties of silk films. The structure and performance of silk fibroin solutions and films are characterized by SEM, AFM, Rheological testing, FTIR, XRD and mechanical test. The results show that degummed silk can be quickly dissolved in three salt/formic acid solvent systems. The color of silk fibroin solution dissolved in CaCl2, LiBr and CaBr2 are pale yellow, yellow and dark yellow, respectively. The silk fibroin nanofiber length and diameter decrease as the color deepens, indicating the degree of dissolution gradually increases. Structural analysis shows that silk fibroin films in three solvent systems all present a β- sheet structure and there are no significant differences in the structure of silk films. Mechanical tests show that the regenerated silk fibroin films in salt/ formic acid systems have a g