Effect of coagulant temperature and composition on surface morphology and mass transfer properties of cellulose acetate hollow fiber membranes
Effect of coagulant temperature and composition on surface morphology and mass transfer properties of cellulose acetate hollow fiber membranes
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混凝剂温度和组成对醋酸纤维素中空纤维膜表面形貌和传质性能的影响
DOI：
10.1002/pat.617
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Ming Yang
中科院分区：
文献类型：
--
作者：
Wen;Ming Yang
采用干喷湿纺技术，在不同的凝固剂组成和温度下纺制了醋酸纤维素中空纤维。利用场发射扫描电子显微镜（FESEM）和轻敲模式原子力显微镜（TMAFM）检查所得中空纤维的表面形态。同时测定了中空纤维的纯水渗透率和葡聚糖截留率。结果表明，当温度大于55°C，DMF含量大于15%时，温度和组成对中空纤维膜的表面形貌影响很大，从而影响中空纤维膜的渗透性能。在线拉伸比随凝固剂温度和外凝固剂中DMF含量（0 ~ 10%）的增加而增加。当纤维在5- 10%DMF和70°C下凝固时，极限拉伸强度也增加。絮凝剂中DMF含量越高，絮凝剂的絮凝效果越好;葡聚糖的截留率随凝固剂中DMF含量的增加和凝固剂温度的升高而降低。版权所有© 2005年约翰威利父子有限公司。
Cellulose acetate (CA) hollow fibers were spun via the dry-jet wet spinning technique under various external coagulant compositions and temperatures. The surface morphology of the resulting hollow fiber was examined using field emission scanning electron microscopy (FESEM) and tapping mode atomic force microscopy (TMAFM). The pure water permeability (PWP) and the retention of dextran of the hollow fiber were also measured. The results showed that both the temperature and composition can affect greatly the surface morphology and hence the permeation performance of hollow fiber membranes when the temperature was over 55°C and the dimethyl formamide (DMF) content was higher than 15%. The on-line draw ratio increased with the coagulant temperature and DMF content (in the range of 0 to 10%) in the external coagulant. The ultimate tensile strength also increased when the fibers were coagulated in 5–10% DMF and at 70°C. The PWP increased with the DMF content in the coagulant and the coagulant temperature. The retention of dextran decreased with the increase of the DMF content in the coagulant and the coagulant temperature. Copyright © 2005 John Wiley & Sons, Ltd.