氯化锂对静电纺PVA溶液稳定段射流的影响

Effect of LiCl mass concentration on stable part of electrospinning PVA polymer solution

静电纺丝过程中,当溶液完全绝缘或施加电压不够高时,静电力不能克服溶液的表面张力,纺丝无法进行。为克服这个问题,需在溶液中加入盐。用聚乙烯醇纺丝液,当添加的LiCl质量分数不同时,纺得的纳米纤维直径从大到小排列顺序为:1%LiCl>0.8%LiCl>0.5%LiCl>0.2%LiCl。研究了LiCl质量分数对轴向坐标的射流半径的影响机制,推导出直线段(稳定段)部分射流半径与轴向坐标符合r^z-1/2的关系,并通过测量添加不同质量分数LiCl的聚乙烯醇纺丝液的射流半径进行实验验证,结果表明实验值与理论值完全吻合。

During electrospinning process,if the solution is insulating completely or the applied voltage is not high enough,the electrostatic force cannot overcome the surface tension,no fiber can be produced by electrospinning.However,if some salt is added in the solution,the problem can be overcome.The diameter of nanofibers electrospun with PVA solutions with different mass concentrations of LiCl shows the following order： 1% LiCl0.8% LiCl0.5% LiCl0.2 % LiCl.Then the theory was studied between LiCl content and jet radius,derived the relation in the stable stage which satisfies：r^z-1/2.Finally,this relation is experimental verified by measuring the jet radius of PVA solution with different mass concentrations of LiCl added.The result accords well with the theory.