He Xuezhong
Department of Chemical Engineering, Faculty of Natural Sciences, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Membranes (Basel). 2017 Jun 5;7(2):27. doi: 10.3390/membranes7020027.
Spinning of cellulose acetate (CA) with the additive polyvinylpyrrolidone (PVP) in -methyl-2-pyrrolidone (NMP) solvent under different conditions was investigated. The spinning parameters of air gap, bore fluid composition, flow rate of bore fluid, and quench bath temperature were optimized based on the orthogonal experiment design (OED) method and multivariate analysis. FTIR and scanning electron microscopy were used to characterize the membrane structure and morphology. Based on the conjoint analysis in Statistical Product and Service Solutions (SPSS) software, the importance of these parameters was identified as: air gap > bore fluid composition > flow rate of bore fluid > quench bath temperature. The optimal spinning condition with the bore fluid (water + NMP (85%)), air gap (25 mm), flow rate of bore fluid (40% of dope rate), and temperature of quench bath (50 °C) was identified to make high PVP content, symmetric cross-section and highly cross-linked CA hollow fibers. The results can be used to guide the spinning of defect-free CA hollow fiber membranes with desired structures and properties as carbon membrane precursors.
研究了在不同条件下，于N-甲基-2-吡咯烷酮（NMP）溶剂中，添加聚乙烯吡咯烷酮（PVP）进行醋酸纤维素（CA）纺丝的情况。基于正交试验设计（OED）方法和多变量分析，对气隙、芯液组成、芯液流速和骤冷浴温度等纺丝参数进行了优化。采用傅里叶变换红外光谱（FTIR）和扫描电子显微镜对膜结构和形态进行了表征。基于统计产品与服务解决方案（SPSS）软件中的联合分析，确定了这些参数的重要性顺序为：气隙＞芯液组成＞芯液流速＞骤冷浴温度。确定了最佳纺丝条件，即芯液（水+NMP（85%））、气隙（25毫米）、芯液流速（原液流速的40%）和骤冷浴温度（50℃），以制备高PVP含量、对称横截面和高度交联的CA中空纤维。这些结果可用于指导制备具有所需结构和性能的无缺陷CA中空纤维膜，作为碳膜前驱体。
