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中文摘要：
利用同轴静电纺丝方法,制备聚丁二酸丁二酯（PBS）-丝素蛋白（SF）核-壳结构复合超细纤维膜,并对复合超细纤维膜进行FE-SEM、TEM形态表征,分析了内层纺丝流率对纤维形貌的影响;通过FTIR和XRD测试,比较了甲醇处理前后复合超细纤维膜分子结构和结晶性能的变化,并进行力学性能测试。结果表明：通过对纤维核层PBS、壳层SF和横截面的观察,复合超细纤维有明显的核-壳结构,可以清晰看出纤维的核层PBS和壳层SF;随着核层纺丝流率的增大,超细纤维的平均直径增大;甲醇处理后,复合超细纤维膜中壳层SF分子结构由无规构象转变为β-折叠构象,复合超细纤维膜核层衍射吸收强度减小,但整个核-壳结构复合超细纤维膜结晶性能无明显变化;甲醇处理后拉伸破坏应力从14.9 MPa增大到17.2 MPa,但拉伸破坏应变从96.8%减小到81.8%。
英文摘要：
Poly（butylene succinate）（PBS）-silk fibroin（SF） core-shell composite ultrafine fibrous membranes were successfully fabricated by coaxial electrospinning and characterized by FE-SEM and TEM,and the fibrous membranes morphologies prepared at different inner flow rates of spinning were observed.The structure,crystallinity and mechanical properties of the composite ultrafine fibrous membranes before and after treatment with methanol were characterized by means of FTIR,XRD and tensile tester.The results indicate that the typical core-shell structure could be found from observing SF shell layer,PBS core,and the cross-section of the fibers.The average diameter of the core-shell composite ultrafine fibers increases with the increasing of the inner flow rate of spinning.After being treated with methanol,the molecular structure of the shell layer SF changes from random conformation into β-sheet conformation.Because of the increasing of the shell thickness,absorption intensity of X-ray diffraction in the core PBS decreases,but the whole crystallization properties of PBS-SF core-shell ultrafine fibrous membranes does not change significantly.Compared with non-treatment,the tensile strength of the electrospun PBS-SF core-shell composite ultrafine fibrous membranes treated with methanol increases from 14.9 MPa to 17.2 MPa,and the failure strain decreases from 96.8% to 81.8%.
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