琼胶/SiO2复合纤维的制备及性能研究

Preparation and properties of agar/SiO2 blend fibers

利用湿法纺丝技术制备了琼胶/SiO2复合纤维,对琼胶分子在溶液中的分散性、纺丝液流变性、纤维的形貌、化学结构分别用DLS、旋转黏度计、SEM、FTIR和XRD进行了表征,并对纤维的力学性能、热性能和吸湿性能进行了测定。研究结果表明:琼胶分子在溶液中呈纳米尺度分布,纺丝液具有良好的流动性;琼胶/纳米SiO2复合纤维具有良好的形态。随着纳米SiO2的添加量逐渐提高,复合纤维的力学拉伸强度先增强后降低,复合纤维的吸水性降低,复合纤维的热稳定性逐渐增强。结合复合纤维综合性能,纳米SiO2的最佳添加质量分数为0.5%。

Agar/SiO2 blend fibers were successfully prepared by the wet-spinning process.The dispersion of agar in solution,the rheological properties of the spinning dope,and the morphology and chemical structure of the fibers were characterized by dynamic light scattering,the rotation viscometer,scanning electron microscopy,Fourier-transform infrared spectroscopy,and X-ray diffraction.The properties of mechanical strength,thermal stability,and water adsorption of the fibers were determined.The results showed that the agar molecules were distributed in nano-scale in solution,the spinning dope featured good fluidity,and the agar/SiO2 blend fibers had a fine uniform morphology.With an increase in the SiO2 concentration,the mechanical strength of the blend fibers first increased slightly and then decreased,the water absorbance of the blend fibers decreased,and the thermal stability of the blend fibers increased.