摘要
采用二甲基乙酰胺(DMAc)与丙酮的混合溶剂,对醋酸纤维素(SCA)电纺过程中溶液性质对纤维直径及形态的影响进行研究。不同的溶液性质具体表现为不同的溶度参数、黏度、表面张力、挥发度等,而纤维直径的细化是以上参数共同作用的结果。而本文中,由于丙酮对溶液的挥发度起了决定性作用,使电纺纤维的直径的改变受其影响最大。当DMAc∶丙酮的混合比为20∶80时,纤维表面会充满凹陷的小孔。另外,无机盐的加入也会导致溶液黏度、表面张力呈先下降后上升的趋势,电导率和电荷密度随之上升。在其他条件一定时,SCA/LiCl体系的纤维直径要小于SCA/CaCl2体系;无机盐含量超过2%时,纤维直径会有一定程度的增加。
The morphologies and diameters of eleetrospun nanofibers were influenced by electrical field and solution properties of evaporation, viscosity, surface tension, and charge density, et al. To investigate the solvent effect on the electrospinning, SCA solutions were prepared with dimethylaeetamide （DMAc） and acetone. Commonly, low viscosity and surface tension could get thin nanofibers, but the acetone played an important role in this experiment because of its high volatility which yielded the reversed results. With the increasing of acetone content in solution, the diameters of eleetrospun nanofibers became large and the surfaces were full of pits. The addition of salts resulted higher conductivity, charge density, lower viscosity and surface tension. Because of the various ion diameters, salts had different effects on the formation of the electrospun fibers.
出处
《合成纤维》
CAS
北大核心
2006年第3期9-12,共4页
Synthetic Fiber in China
关键词
电纺丝
混合溶剂
无机盐
表面张力
挥发度
electrospinning, mixture solvent, soluble salts, surface tension, volatility
