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Stabilization of electrospun poly(vinyl alcohol) nanofibrous mats in aqueous solutions
Authors:Sheng-guang Cao  Zhao-fang Liu  Bing-huan Hu  Hai-qing Liu
Affiliation:College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China Fujian Key Laboratory of Polymer Materials, Fuzhou 350007, China
Abstract: The stability of poly(vinyl alcohol) (PVA) nanofibrous mats in water media was improved by post-electrospinning treatments. Bifunctional glutaraldehyde (GA) in methanol was used as a crosslinking agent to stabilize PVA nanofiber, but fiber twinning was observed frequently, and the highly porous structure of PVA nanofibrous mats was destroyed when the crosslinked fiber was soaked in water. To overcome this shortcoming, chitosan (CS) was introduced into the PVA spinning solution to prepare PVA/CS composite nanofibers. Their treatment in GA/methanol solution could retain the fiber morphology of PVA/CS nanofibers and porous structure of PVA/CS nanofibrous mats even if they were soaked in aqueous solutions for 1 month. Scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) were applied to characterize the physicochemical structure and thermal properties of PVA nanofibers. It was found that the water resistance of PVA nanofibrous mats was enhanced because of the improvement of the degree of crosslinking and crystallinity in the electrospun PVA fibers after soaking in GA/methanol solution.
Keywords:Electrospinning  Polyvinyl alcohol  Chitosan  Nanofiber
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