熔体静电纺丝装置中内外锥面喷头电场的研究

Study of Electric Field for Inner and Male Cone Nozzle in Melt Electrospinning Device

研制了一种新型熔体静电纺丝装置,研究其纺丝喷头为内外锥面不同形状时的电场分布规律及电场对纺丝过程和纤维直径的影响。采用有限元法(ANSYS软件)模拟纺丝电场,并与实验对照分析,发现两种情况下电场分布基本相同,外锥面喷头的最大场强明显比内锥面喷头大,纤维直径也较小,同时发现纺丝距离和外加电压对电场和纤维直径有较大影响。为进一步细化纤维,对内锥面喷头装置通入热风辅助纺丝,发现纺得纤维较外锥面更细,直径在10μm以内,最小平均直径约为3μm。

A new melt electrospinning device was developed. The electric field distribution of nozzle shapes of inner and external cone and effects of electric field on the process and fiber diameter were studied. The finite-element model with ANSYS software was builted and a series of experiments were made. The results show that two kinds of nozzles have the same distribution of electric field basically, but the maximum field strength of external cone nozzle is significantly larger than that of inner cone nozzle, so its fiber diameter is also smaller. What＇ s more, the spinning distance and applied voltage have great influence on electric field and fiber diameter and fiber diameter. In order to obtain thinner fibers, the inner cone nozzle device assisted by hot gas was carried out and resultant fiber diameter is kept less than 10 μm, and the minimum average fiber diameter is about 3μ m, which are smaller than that made by external cone nozzle.