采用气喷的方式将银纳米线-聚偏氟乙烯(AgNWs-PVDF)纺丝液喷射到PP熔喷布上,制备微-纳米结构的AgNWs-PVDF气喷/熔喷复合材料,并对其形貌、接触角、孔隙、力学、过滤以及抗菌性能等进行表征.结果表明:熔喷PP纤维的直径为2μm,气喷AgNWs-PVDF纤维直径仅为99.5 nm;经纳米和微米纤维复合后,材料的过滤效率明显提高,最高增长48.61％;而过滤阻力变化不大,仅增加2 Pa;复合材料与熔喷布相比疏水性有所提高,接触角增至138°;Ag-NWs的抗菌优势使材料对大肠埃希菌和金黄色葡萄球菌有明显抑制作用,抑菌圈直径分别达25.56、26.13 mm.
Preparation of AgNWs-PVDF air injection/Melt-blown composites and their properties
The micro-nano-structured AgNWs-PVDF/melt-blown composites are prepared by air-spraying AgNWs-PVDF spinning solution onto polypropylene(PP)melt-blown cloth.The morphology,contact Angle,porosity,mechanical property,filtration and antibacterial properties of the composites are characterized.The results show that the diameter of melt-blown PP fiber is 2 μm,whereas the diameter of AgNWs-PVDF fiber is only 99.5 nm.The filtration efficiency of the micro-nano fibers composite is significantly increased with a maximum increase of 48.61％,while the filtration resistance is only increased by 2 Pa.Compared with the melt-blown cloth,the hydrophobicity of the composite is improved,and the contact angle is increased to 138°.Owing to the antibacterial advantage of AgNWs,the composites have obvious inhibition effect on Escherichia coli and Staphylococcus aureus with the diameter of antibacterial zone of 25.56 mm and 26.13 mm,respectively.
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