壳聚糖/聚乙烯醇共混超细纤维的制备及紫外光交联研究

用静电纺丝法制备壳聚糖/聚乙烯醇的共混超细纤维,采用扫描电镜考察了纺丝液浓度、共混物配比、喷丝口内径对纤维形貌的影响.此外,为减少壳聚糖/聚乙烯醇纤维膜的溶胀变形,在上述体系中加入可光交联的单体二缩三乙二醇双甲基丙烯酸酯(TEGDMA)、引发剂2-羟基-2-甲基-1苯基丙酮(1173),对电纺纤维进行紫外光交联.结果表明,当壳聚糖与聚乙烯醇质量比为8:2的共混体系中加入占混合溶液质量分数4%的TEGDMA、0.12%的1173作为交联剂时,所得的无纺布纤维直径比较均一,平均约为200 nm,经光交联处理后其耐水性能得到提高.

ELECTROSPUN CHITOSAN/POLY(VINYL ALCOHOL) BLEND ULTRAFINE FIBERS AND THEIR ULTRAVIOLET PHOTOCROSSLINKING

Ultrafine fibers of chitosan/poly(vinyl alcohol)(CS/PVA) were prepared by electrostatic spinning.The effects of solution concentration,mass ratio of CS/PVA and internal diameter of syringe needle on the morphology of ultrafine fibers were investigated by scanning electron microscope(SEM).Furthermore,photocurable monomer triethylene glycol dimethylacrylate(TEGDMA)and photoinitiator 2-hydroxy-2-methyl-1-phenylpropan-1-one were introduced into the CS/PVA blend solution to increase the water-resistance of the fibers,which is a common shortcoming of water soluble polymer fiber.The SEM results showed that,after UV radiation,the water-resistance of fibers was obviously improved by intrafiber-photocrosslinking when the CS/PVA weight ratios is 8∶2 and the concentration of TEGDMA and photoinitiator are 4 wt% and 0.12 wt%,respectively.The average diameter of fibers obtained by this method is around 200 nm.