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采用装配有疏水铜网的新型喷头研究了超细纳米纤维的制备.静电纺丝实现之前,首先对铜网进行了疏水处理,并将其安装于喷头前端.静电纺丝过程中,聚合物溶液由精密注射泵输送至喷头处.安装于喷头的铜网可将管道内的聚合物溶液分成多股细流从铜网网孔中流出.从铜网网孔流出的溶液细流受电场力作用被拉伸成多股独立射流,并从喷头携带走聚集的正电荷.受铜网表面疏水性和射流间电荷排斥力的影响,从铜网喷射出的多股射流都将保持其独立的轨迹而不会产生聚集.疏水铜网有利于减小纺丝射流的初始直径,并获得均匀的超细纳米纤维.利用新型的电纺丝喷头成功制备了直径20～80 nm的聚氧化乙烯(PEO)和聚乙烯醇(PVA)超细纳米纤维.实验结果表明,超细纳米纤维的直径随着电纺丝溶液浓度的增加而变大.
The preparation of ultrafine nanofibers was investigated using a novel nozzle equipped with a hydrophobic copper mesh.At the beginning of electrospinning, the copper mesh was first hydrophobized and installed on the front of the spray head.In the electrospinning process, the polymer solution The precision syringe pump delivered to the nozzle at the nozzle installed in the copper network can be polymer solution pipe into a plurality of thin flow out of the network from the copper mesh flow from the copper mesh flow of thin electrolyte flow field by the force Is stretched into multiple independent jets and carries aggregated positive charges away from the jets, and multiple jets ejected from the copper net will retain their independent trajectories, due to the surface hydrophobicity of the copper net and the repulsive charge between the jets But does not produce agglomeration.The hydrophobic copper mesh is helpful to reduce the initial diameter of the spinning jet and obtain uniform ultrafine nanofibers.Polyethylene oxide (PEO) with a diameter of 20 ~ 80 nm has been successfully prepared by a novel electrospinning nozzle ) And polyvinyl alcohol (PVA) ultrafine nanofibers.The experimental results show that the diameter of ultrafine nanofibers increases with the concentration of the electrospinning solution.