丝胶组分和高湿后处理对静电纺丝素纤维结构与性能的影响

利用静电纺丝法制备了再生丝素和再生丝素/丝胶蛋白纤维,并对所得纤维进行了高湿后处理。采用扫描电镜分析了丝胶蛋白和高湿后处理对静电纺再生丝素蛋白纤维形貌的影响,采用拉曼光谱、X射线衍射和热失重分析研究了所得纤维微细结构及热性能。研究结果表明,添加丝胶蛋白有利于降低静电纺再生丝素蛋白纤维的直径及其分布,而高湿后处理对纤维的形貌没有明显影响;添加丝胶蛋白和/或高湿后处理有利于促进丝素发生向β-折叠构象的转变,并使纤维的结晶结构得到改善,从而进一步提高纤维的热稳定性。

Effect of Silk Sericin and High Moisture Treatment on the Structure and Properties of Electrospun Silk Fibroin Fibers

Regenerated silk fibroin(RSF) and RSF/sericin(SS) fibers were electrospun and then post-treated under the high moisture.The influences of the addition of SS and high moisture treatment on the morphology of electrospun fibers were studied by scanning electron microscope(SEM).The structure and thermal properties of the electrospun fibers were characterized by Raman spectroscopy,X-ray diffraction(XRD) and thermogravimetric analysis(TGA).It is found that both the average diameter and diameter deviation for electrospun fibers decrease with the addition of SS,while the fiber morphology does not change obviously after the high moisture treatment.Furthermore,the conformational transition of RSF to β-sheet structure is induced by the addition of SS and/or high moisture treatment,resulting in the improvement of the crystal structure and mechanical properties of resultant electrospun fibers.