In order to develop the mechanical properties of sodium alginate ( SA) fiber, the spinning solution of silk fibroin/so-dium alginate ( SF/SA) was prepared by blending SA with SF extracted from silkworm cocoon and was produced into SF /SA com-posite 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 pseudo-plastic fluid;the apparent viscosity of the spinning solution was increased with the increase of silk fibroin content and the struc -tural 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 βpleated 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 sur -face;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％.%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.
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