丝素蛋白/海藻酸钠复合纤维的制备与性能表征

Preparation and properties characterization of silk fibroin/sodium alginate composite fiber

为了提高海藻酸钠(SA)纤维的力学性能,将从蚕茧中提取的丝素蛋白(SF)和SA共混,制备了SF/SA纺丝溶液,通过湿法纺丝制得SF/SA复合纤维,对纺丝溶液流变性能进行了研究,对SF/SA复合纤维进行了结构与性能表征。结果表明:SF/SA纺丝溶液为切力变稀的假塑性流体,纺丝溶液的表观黏度随SF含量增加呈增加的趋势,当SF质量分数(相对SA)为10%时,纺丝溶液结构黏度指数最小,可纺性最好;提取的SF以无规卷曲结构和β-折叠结构为主,SA和SF间有较强的氢键作用;SF/SA复合纤维以非晶形态存在,纤维表面存在明显的沟槽结构,与纯SA纤维相比,SF的加入提高了SA纤维的力学性能,SF质量分数为10%的SF/SA复合纤维的断裂强度高达1.63 cN/dtex,较SA的提高了22.5%,SF的加入使复合纤维的耐热性略有降低。

In order to develop the mechanical properties of sodium alginate（ SA） fiber,the spinning solution of silk fibroin/sodium alginate（ SF/SA） was prepared by blending SA with SF extracted from silkworm cocoon and was produced into SF/SA composite fiber by wet spinning process. The rheological behavior of the spinning solution was studied. The structure and properties of SF/SA composite fiber were characterized. The results showed that the SF/SA spinning solution was a shear-thinning pseudoplastic fluid; the apparent viscosity of the spinning solution was increased with the increase of silk fibroin content and the structural viscosity index was minimized but the spinnability was optimized at the SF mass fraction of 10% based on SA; the extracted SF was dominantly of random-coil conformational structure and β pleated sheet structure,and there was strong hydrogen bond effect between SA and SF; the SF/SA composite fiber existed in the amorphous morphology with obvious grooves on the fiber surface; the addition of SF could increase the mechanical properties of SA fiber and could slightly decrease the heat resistance of SF/SA composite fiber; as compared with that of pure SA fiber,the breaking strength of SF/SA composite fiber was up to 1. 63 cN/dtex with a growth of 22. 5% when the SF mass fraction was 10%.