热致相分离法制备聚丙烯腈中空纤维膜及膜孔结构与成形机理研究

项目名称： 热致相分离法制备聚丙烯腈中空纤维膜及膜孔结构与成形机理研究

项目编号： No.21206123

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 化学工程及工业化学

项目作者： 韩娜

作者单位： 天津工业大学

项目金额： 25万元

中文摘要： 聚丙烯腈(PAN)中空纤维膜具有成本低廉、耐腐蚀、抗老化、亲水性较好等特点，但国内外一直只能采用溶液纺丝法制备，膜结构不易控制、力学性能差，工艺复杂、能耗高且污染环境。本课题以自制的可熔融丙烯腈-丙烯酸甲酯共聚物(AN-MA)为基体，采用热致相分离法(TIPS)结合拉伸工艺制备PAN中空纤维膜。主要在以下三方面展开研究：1)混合稀释剂与AN-MA的相互作用对相图及相分离过程的影响；2)非等温及应力作用下膜孔结构的变化规律及成形机理，完善非等温液滴生长动力学，建立应力下膜孔生长动力学模型，实现膜孔结构的可控；3)纺丝工艺对PAN中空纤维膜结晶和取向的影响规律；超临界流体萃取对膜结构及性能的影响。总体目标：建立TIPS法制备PAN中空纤维膜的基础理论，在理论和实验的支持下，实现膜孔和纤维结构的可控。项目成果符合绿色低碳的要求，进一步丰富TIPS的基础理论，促进PAN中空纤维膜的快速、稳定发展。

中文关键词： 丙烯腈-丙烯酸甲酯共聚物；热致相分离；微孔膜；结构；性能

英文摘要： Polyacrylonitrile (PAN) hollow fiber is low price, corrosion-resistant, and ageing-resistant. It also has good biocompatibility and hydrophilicity. However, the conventional approach for producing PAN-based fiber is solution-spininning. The membrane structure is not easy to be controlled and has a poor mechanical property. Furthermore, solution spinning is complex, high power consumption and polluting the environment. In this study, the melt processable acrylonitrile-methylacrylate copolymer (AN-MA) was used as a precursor, the AN-MA hollow fibers were formed by thermally induced phase separation method (TIPS) and stretching. This project will be identified mainly in the following three aspects: 1) the interactions between thinner mixture and AN-MA copolymer, effects of the interactions on the phase separation behaviors and phase diagrams; 2) the changing law and forming mechanism of pore structure under non-isothermal and stress conditions, completing non-isothermal kinetics of droplet growth, establishing growth kinetics model of membrane pore under stress condition; 3) influences of spinning technology on the crystallization and orientation of PAN hollow membrane, effects of supercritical extraction on structures and properties of hollow fiber. We aimed at establishing a basic theory of preparing PAN hollow m

英文关键词： poly(acrylonitrile-co-methyl acrylate)；Thermally induced phase separation；Microporous membranes；structure；property