The Preparation And The Structure Of PVA/PEO/MWNTs Compound Electrospinning Fibers

Electrospinning is a convenience, direct and simple method for nano-fiber preparation. Compares with the ordinary fiber, nano-fibers prepared by electrospinning has larger surface area and the high adsorbability,which in recent years attracted great attention at home and abroad.In this study, two kinds of water-soluble high polymer material, the polyvinyl alcohol (PVA) and the polyoxyethylene (PEO), were selected as raw materials, and water was taken as solvent to prepare electrospinning fibers. Orthogonal experiment was used to analysis the influence of electrospinning process parameters on PVA/PEO compound nanofibers morphology. MWNTs which has unique physics and chemistry character were added into PVA/PEO blending system to prepare the PVA/PEO/MWNTs compound nano-fiber. In order to have the good dispersion in the polymer blending system, MWNTs was purified and dispersed .The influences of the addition content , the addition method and the aspect ratio of carbon nanotubes on morphology and structure of composite fibers were also studied. The composite fibers has potential applications in electric conduction.PVA/PEO physics blending solution was used as electrospinning solution, electrospinning of single factor, orthogonal experiments with three factor and three levels (3 x 3) were carried. The results showed that optimal conditions is voltage 90 kV(-), receiving distance 30 cm , needle diameter 5.5 mm . The thinnest fiber diameter was 590nm .After being purified and dispersed , MWNTs were added into PVA/PEO blending aqueous solutions to prepare PVA/PEO/MWNTs composite ultra-fine fiber. The results showed that MWNTs have good dispersion stability in aqueous solutions after dispersed by SDS . The avenage diameter of composite ultra-fine fiber increases with decreasing addition content . When there is no MWNTs in blending aqueous solutions , the fiber average diameter is 857 nm ; when the addition content of MWNTs is 1.5 wt % , the fiber average diameter is 700 nm, and surface of fibers is smooth , distribution is uniform .When MWNTs dispersed by PVA were added as solvent to prepare polymer solution, the dispersion of MWNTs aqueous solutions becomes better . After electrospun, With increasing MWNTs content , the fiber diameter decreases ; when the MWNTs content increases from 0.27% to 0.53% , the fiber diameter decreases to 368nm . When the MWNTs content increases to a certain value , the conductivity of the solution decreases, the fiber diameter increases . The diameter of the fiber electrospun by the polymer solution added with L-MWNTs is smaller than that added with S-MWNTs .