【摘要】 将不同质量比的丝素蛋白(SF)/醋酸纤维素(CA)溶于甲酸中,配制成共混溶液进行静电纺丝,得到SF/CA共混纤维毡。利用SEM、XRD对其结构进行测试表征。结果表明:SF中添加少量CA(<10%),SF的可纺性显著提高;添加10%CA时,可纺性最好,所得共混静电纺纤维细且均匀,直径为50～300 nm;CA添加量大于30%时,可纺性恶化,出现大量的珠状物,且纤维黏连,不连续,形成树枝状结构。XRD分析表明,添加少量CA(<10%)能诱导SF分子构象由无规卷曲向β折叠转变,但CA添加量大于30%时,SF与CA二者分相。更多还原

【Abstract】 The blend solution prepared by dissolving silk fibroin(SF) and cellulose acetate(CA) in formic acid at different mass concentrations was electrospun into SF /CA blend fibers and then processed into SF /CA felt.The SF /CA fiber felt was studied by SEM and XRD.The results showed that the spinnability of SF was remarkably improved with a small quantity of CA(no more than 10%),and the blend fibers were fine and uniform with the fiber diameters ranging from 50 nm to 300 nm.When CA content was 10%,the SF /CA blends showed excellent spinnability without any beads or droplets.However,the spinnability of SF /CA deteriorated seriously when the content of CA was more than 30%,and the electrospun SF /CA blend nanofibers were discontinuous,sticky,and forming dendritic structure with lots of beads.The XRD analysis showed that adding a small quantity of CA(no more than 10%) could induce the conformation transition of SF molecules transforming from random coil to β-sheet.Nevertheless,the phase separation was observed between SF and CA in blend nanofibers when the content of CA was more than 30%.更多还原