静电纺丝技术制备EVOH-g-SO3H无纺布膜的研究

采用高压静电纺丝法制备了EVOH-g-SO3H离子聚合物无纺布膜,并采用扫描电子显微镜(SEM)及X射线衍射仪(XRD)对该无纺布膜的微观形貌及结晶行为进行了表征.结果表明:EVOH-g-SO3H离子聚合物无纺布膜中存在无规的纤维和珠状物;当纺丝电压和板间距增大,或者采用快挥发性溶剂时,无纺布膜中纤维和珠状物的平均直径将减小;当纺丝液浓度从12%变化到20%时,无纺布膜的微观形貌由球滴状物变化为珠丝状物,可以明显地观察到从电喷到电纺的变化过程;XRD分析表明通过静电纺丝有新晶形的形成.

Electrospinning process and microstructural characterization of EVOH-g-SO3H non-wovens

Electrospinning produced comb-like single ionic polymer membranes of poly(ethylene co vinyl alcohol) end-capped with sulfonic acid(EVOH-g-SO3H).The micromorphology and crystallization of the electrospun non-woven membranes were studied by a scanning electron microscope(SEM) and X-ray diffraction(XRD),respectively.The SEM results indicate that a beads-on-string morphology is dominant in the membranes.The fiber and bead diameters of membranes decrease with the electrospinning voltage and deposition distance increasing,and the fiber diameter of membranes also decreases when the volatile solvents with low boiling point is adopted.As the solution concentration increased from 12% to 20%,there was a transition from electrospraying to electrospinning,with the micromorphology changing from coagulation beads to hairy beads.The XRD result indicates that the amorphous degree rather than crystallization could be developed by electrospinning.