【摘要】 在制备具有良好力学性能的蚕丝纤维/丝蛋白复合材料的基础上,采用力学测试、扫描电镜以及广角X-射线衍射等手段,考察了溴化锂预处理和甲醇后处理这两种方法对蚕丝纤维/丝蛋白界面性能的影响.力学测试的结果表明,在相同纤维含量(如20 wt%)的情况下,采用6 mol L-1溴化锂对定向排列的蚕丝纤维预处理10 min,所得的蚕丝纤维/丝蛋白复合材料力学性能最佳,其平行于纤维排列方向的拉伸强度、断裂伸长率及断裂能分别达到142 MPa、23.5%和18.6 kJ kg-1.复合材料经甲醇后处理后,其垂直于纤维方向的拉伸强度和断裂伸长率(与未经任何处理的复合材料相比)分别为46 MPa(versus 20 MPa)和2.4%(versus 1.3%),表明蚕丝纤维和丝蛋白基体间的界面粘结力有了进一步提高.同时扫描电镜对复合材料拉伸断面的观察也显示,两种处理都能够使蚕丝纤维与丝蛋白基体的界面结合性能得到明显的改善.更多还原

【Abstract】 In order to fabricate a high performance silk fiber/fiboin composite,both effects of LiBr pretreatment and methanol post treatment on the interface compatibility between the silk fiber and the silk fibroin matrix were studied in this article.The mechanical properties,structure and morphology of the silk fiber/fibroin composite were investigated via tensile test,X-ray diffraction(XRD) and scanning electron microscopy(SEM),etc.The results of tensile test demonstrated that the optimized pretreatment method was achieved by employing 6 mol L-1 LiBr aqueous solution on aligned silk fibers for 10 min.Under such pretreatment,the longitudinal tensile stress,elongation at break and breaking energy of the silk fiber/fibroin composite with a silk amount of 20 wt% were 142 MPa,23.5% and 18.6 kJ kg-1,respectively.After methanol post treatment,the interface adhesions of the silk fiber/fibroin composite were further enhanced as compared to the untreated ones.The transverse tensile stress and elongation at break were 46 MPa(versus 20 MPa) and 2.4%(versus 1.3%),respectively.Besides,SEM images of the fracture section of silk fiber/fibroin composites in the directions parallel and perpendicular to the fiber array also showed that the compatibility between the silk fiber and the silk fibroin matrix was improved after both treatments.更多还原