Effect of post-drawing on the mechanical and mass transfer properties of polyacrylonitrile hollow fiber membranes
Effect of post-drawing on the mechanical and mass transfer properties of polyacrylonitrile hollow fiber membranes
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DOI：
10.1016/0376-7388(96)00055-5
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发表时间：
1996-08
影响因子：
9.5
通讯作者：
Ming Yang;Ming-Tze Chou
中科院分区：
文献类型：
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作者：
Ming Yang;Ming-Tze Chou
研究了拉伸条件对纺制聚丙烯腈中空纤维的影响。拉伸条件包括拉伸比、温度和拉伸浴中二甲基甲酰胺的浓度。用扫描电子显微镜检查所得的中空纤维。中空纤维的内径和外径均随着拉伸比的增加而减小。在拉伸纤维的外表面上观察到微孔。在干燥和湿润状态下测量所得中空纤维的应力-应变行为。断裂强度随着拉伸比的增加而增加，干样品的断裂强度高于湿样品。干样品的断裂伸长率随着拉伸比的增加而增加，而湿样品则表现出相反的趋势。测量渗透性能。孔径随着拉伸比的增加而增加。纯水的水渗透率随着拉伸比的增加而显着增加。然而，增加拉丝浴中二甲基甲酰胺的浓度会降低孔径和水力渗透率的增加。根据方差分析，孔径和水力渗透率主要受拉伸比的影响，其次受拉伸浴中DMF浓度和拉伸温度的影响。
The effects of the drawing conditions on spun polyacrylonitrile hollow fibers were investigated. The drawing conditions included draw ratio, temperature, and concentration of dimethylformamide in the drawing bath. The resulting hollow fiber was examined with a scanning electron microscope. Both the inner and outer diameters of the hollow fibers decreased with the increase in draw ratio. Microvoids were observed on the outer surface of the drawn fibers. The stress-strain behavior of the resulting hollow fibers was measured in both the dry and wet states. The breaking strength increased with the draw ratio, which was higher for the dry samples than for the wet samples. The breaking elongation of the dry sample increased with the draw ratio, whereas the wet sample showed opposite trend. The permeation performance was measured. The pore size increased with the draw ratio. The hydraulic permeability of pure water increased markedly with increase in the draw ratio. However, increasing the concentration of dimethylformamide in the drawing bath reduced the increase in the pore size and hydraulic permeability. On the basis of the analysis of variance, both the pore size and hydraulic permeability were influenced mostly by the draw ratio, and slightly by the concentration of DMF in the drawing bath and by the drawing temperature.