复合静电纺制备螺旋纳米纤维工艺参数的研究

摘要

利用复合静电纺技术,以Nomex(聚间苯二甲酰间苯二胺)和TPU(聚氨酯)为原料,设计并利用不同复合结构的喷嘴(包括同轴喷嘴、并列喷嘴和偏芯喷嘴)分别纺丝制备出螺旋纳米纤维,从而与单针共混的纺丝结果进行了对比.分析了溶液性质(包括LiCl质量分数和TPU溶剂)和纺丝电压对螺旋纳米纤维形成的影响.结果表明:偏芯喷嘴更易于制备出螺旋纳米纤维;LiCl质量分数高不利于螺旋纳米纤维的形成;TPU与Nomex溶剂相容性好,不利于螺旋纳米纤维形成;纺丝中两种溶剂相容性差异大,有一定挥发性,则螺旋纳米纤维形成效率高.%Helical nanofibers are prepared with Nomex(poly (m-phenylene isophthalamide)) and TPU (polyurethane) via co-electrospinning.Three co-electrospinning systems,including the coaxial,the sideby-side and the off-centered systems,are adopted to prepare helical nanofibers and compared with singleneedle system.Meanwhile,the effects of solution properties (including LiCl mass fraction and solvent of TPU) and voltage on the formation of helical nanofibers are studied.The experimental results demonstrate that off-centered system seems to produce more uniform helical structures.The higher mass fraction of LiCl is not conducive to the formation of helical nanofibers.The two solvents of TPU and Nomex have a good compatibility,which is not conducive to the formation of the helical nanofibers.Great difference of compatibility between the two solvents and a certain volatility are more conducive to the formation of helical nanofibers.