中文摘要：

将含固体质量分数为5％的海藻酸钠纺丝原液与纳米二氧化钛（TiO2）水分散液均匀混合，制得海藻酸钠／纳米TiO2混合纺丝原液，采用湿法纺丝，通过氯化钙凝固浴，经拉伸、水洗，制备了海藻酸钙／纳米TiO2共混纤维，研究了纳米弱02含量对共混纤维结构及性能的影响。结果表明：纳米TiO2的加入，提高了共混纤维的力学性能；加入质量分数为0．5％的纳米TiO2，海藻酸钙大分子链上的红外特征吸收峰峰形明显变宽，共混纤维的力学性能最佳，断裂强度为2．93cN／dtex，断裂伸长率为7．34％，优于海藻酸钙纤维；添加纳米TiO2质量分数为3％时，纳米TiO2在共混纤维中仍能较好的分散，且纤维表面光滑。加入纳米TiO2后，共混纤维的热稳定性提高。

英文摘要：

Sodium alginate/nano-titanium diozide（TiO2 ） blend spinning solutions were prepared by blending sodium alginate spinning solution with 5% solid mass fraction and nano-TiO2 aqueous suspension, from which the calcium alginate/nano-TiO2 blend fibers were prepared via wet spinning process comprising calcium chloride coagulation bath, drawing and washing. The effect of nano-TiO2 content on the structure and properties of the blend fibers was studied. The results showed that the introductin of nano-TiO2 particles promoted the mechanical properties of blend fibers; the FTIR characteristic peaks of calcium alginate were greatly broaden and the blend fibers had the optimal mechanical properties among which the breaking strength was 2.93 cN/dtex and elongation at break 7.34% as the mass fraction of nano-TiO2 particles was 0.5% ; the blend fibers werw superior to calcium alginate fiber in mechanical properties; nano-TiO2 particles had good dispersion in the blend fibers and the fibers had smooth surface as the mass fraction of nano-TiO2 particles was 3% ; the thermal stability of the blend fibers was improved due to the introduction of nano-TiO2 particles.