具有微米级内外径CTA中空纤维膜制备与表征

Preparation of CTA hollow fiber membrane with micron-sized inner and outer diameters

利用干湿法通过改变纺膜条件来调控中空纤维膜尺寸制备具有微米级内外径的三醋酸纤维素(CTA)中空纤维膜.结果表明,中空纤维膜的内外径随铸膜液流量和芯液流量的增加而增加,随收丝速度的增加而减小;内外径随空气段高度的增大而略微减小;其中铸膜液和芯液流量对膜尺寸的影响最为显著.此外,考察了这些因素对膜微观结构及纯水通量性能的影响,结果表明,本研究中这些因素对膜结构的影响较小,所有膜都具有海绵状孔;纯水通量随着铸膜液和芯液流量的增加而显著增加,随空气段高度和收丝速度的增加而稍有增加.

Cellulose triacetate(CTA)hollow fiber membrane with micron-sized inner and outer diameters was prepared using dry-wet spinning method by changing fabrication parameters to control the dimension of hollow fiber membranes.The results show that the inner and outer diameter of the hollow fiber membranes increased with the increase of dope and bore flow rate and decreased with the increase of take-up speed.The inner and outer diameter decreased slightly with the increase of air gap distance.The influence of dope and bore flow rate on membrane diameters was most significant among all the parameters.Besides,the effects of these factors on morphology and pure water flux of hollow fiber membranes were investigated.The results showed that morphology of membranes in this study is insensitive to these factors and all prepared membranes have spongy-like structure.Pure water flux of membranes increased obviously with the increase of dope and bore flow rate but increased slightly with the increase of take-up speed and air gap distance.