Wet-spinning of Boron Nitride Nanotube Liquid Crystal for Multifunctional Polymeric Composite Fibers
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Wet-spinning of CNT liquid crystal (LC) has been reported as a promising way to produce a high-performance fiber with multifunction owing to highly ordered nanotubes inside the fiber which greatly improves its material properties. Up to now, the LC wet-spinning method with boron nitride nanotubes (BNNTs), an emerging nanomaterial with excellent specific strength and oxidation resistance, has not been reported due to difficulty in preparation of highly stable dispersions of BNNT to prepare lyotropic BNNT LCs at high concentration. Here, we introduce a facile method to prepare lyotropic BNNT LCs with polymeric dispersing agent. The BNNT LCs were processed into a fiber possessing internal microstructure of unidirectionally aligned BNNTs by wet-spinning. The aligned BNNTs inside the fiber were characterized by polarized optical microscopy (POM) and Raman spectroscopy. In addition, mechanical property of the fiber was studied to the structure-property relationship of BNNT fibers.