磁场辅助静电纺PAN纳米纤维有序度的研究

Alignment of PAN nanofibers by magnetic-field-assisted electrospinning process

采用磁场辅助静电纺丝法制备了有序聚丙烯腈(PAN)纳米纤维,分析了PAN/二甲基甲酰胺(DMF)溶液浓度、纺丝电压、注射速度、磁铁间距和溶剂DMF及DMF与二甲基亚砜(DMSO)混合溶剂等因素对PAN纤维有序度的影响。结果表明:随着PAN/DMF溶液中PAN浓度增大,PAN纤维有序度逐渐增大;注射速度对纤维有序度影响不明显;随着纺丝电压和磁铁间距增大,PAN纤维有序度先增大后减小;DMSO的加入,使溶液可纺性降低,不利于纤维有序排列;对于PAN/DMF溶液体系,适宜的磁场辅助静电纺丝的工艺参数为PAN质量分数12%,纺丝距离12 cm,电压14 k V,注射速度0.5 m L/h,磁铁间距2.5 cm,纺丝得到的PAN纳米纤维的有序度为92%。

An aligned polyacrylonitrile （PAN） nanofiber was prepared by magnetic-field-assisted electrospinning process. The effects of PAN/dimethylformamide （DMF） solution concentration, spinning voltage, injbction speed, magnet space and DMF or DMF/dimethyl sulfoxide （DMSO） mixture solvent on the fiber alignment were analyzed. The results showed that the alignment of PAN fiber gradually increased with the increase of PAN concentration of PAN/DMF solution; the injection speed had no obvious effect on the fiber alignment; the alignment of PAN fiber was increased and then decreased with the increase of spinning voltage and magnet space; the addition of DMSO made the solution spinnability decrease and damaged the alignment of PAN fiber; the PAN nanofiber prepared from PAN/DMF solution system exhibited the alignment of 92% under the magnetic-field-assisted elec- trospinning process conditions as followed： 12% PAN by mass fraction, spinning distance 12 cm and voltage 14 kV, injection speed 0.5 mL/h, magnet space 2.5 cm.