Effect of salt removal and heat-pressing treatments on mechanical properties of electrospun meta-aramid nanofibres Online publication date: Mon, 20-Jun-2016
by Su-Yeol Ryu; Seung-Yeop Kwak; Myung-Kyu Park
International Journal of Nanotechnology (IJNT), Vol. 13, No. 4/5/6, 2016
Abstract: Compared with commercial meta-aramid fibres, the electrospun meta-aramid nanofibres (mANFs) show insufficient mechanical properties because the polymer chains are not possible to have a well-developed molecular orientation. The aligned mANFs with LiCl salt was prepared using electrospinning apparatus with drum-collector, and the nanofibres with enhanced mechanical properties were obtained by repetitive washing and fast heat-pressing treatment. The salt remaining between meta-aramid chains interrupted the arrangement of the chains, whereas salt-removed nanofibre showed arrangeability of polymer segments. The fast heat-pressing induced effective adhesion between nanofibres, and the mechanical properties of heat-pressed nanofibres increased dramatically along the nanofibre-aligned direction. These results indicate that removal of salt in nanofibres and a physical adhesion between adjacent nanofibre strands contribute to the enhancement of mechanical properties of mANFs.
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