海藻酸钙/纳米TiO_2共混纤维的制备与表征

Preparation and characterization of calcium alginate/nano-TiO_2 blend fiber

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TiO2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2.93 cN/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。

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.