Experimental and Modeling Studies of the TIPS Membrane Formation Process

摘要提案编号：9713322提案类型：研究员发起的首席研究员：William B.Krantz隶属关系：科罗拉多大学博尔德分校这笔赠款是通过化学和运输系统司界面、运输和分离计划中的分离和净化计划子要素授予的。首席研究员是科罗拉多大学的威廉·克兰茨博士。该研究涉及热诱导相分离过程(TIPS)成膜的基础研究。该过程包括冷却聚合物溶液以实现相分离，并形成致密的聚合物相，然后回收并形成膜。研究人员建议对含氟聚合物进行研究，因为这些膜具有潜在的广泛适用性，而且缺乏最佳膜制作的基础知识。这项研究的一个新的方面是使用声时域反射仪(ATDR)来表征热诱导相变，并获得随时间变化的聚合物相厚度。ATDR还可以提供有关膜微结构的信息，是对通过电子显微照相获得的信息的补充。最后，研究人员试图使用与合金凝固理论的类比来模拟TIPS过程。这项研究将对通过热诱导相分离过程形成的膜有更好的了解。这应该会对膜的设计和浇注过程产生直接影响，以微调孔分布和膜厚度。应用于各种适用于化工、石油和制药行业的膜分离技术。

Abstract Proposal No: 9713322 Proposal Type: Investigator Initiated Principal Investigator: William B. Krantz Affiliation: University of Colorado at Boulder This grant is awarded through the Separations and Purification Program sub-element of the Interfacial, Transport and Separations Program of the Chemical and Transport Systems Division. The principal investigator is Dr. William Krantz of the University of Colorado. The research involves fundamental studies of the thermally induced phase separation process (TIPS) for membrane formation. The process involves cooling a polymer solution to effect phase separation and the formation of a dense polymer phase which is then recovered and becomes the membrane. The investigators propose to conduct their studies on fluorinated polymers due to the potentially wide applicability of these membranes and the lack of fundamental knowledge on optimal membrane fabrication. A novel aspect of the research is the use of acoustic time-domain reflectometry (ATDR) to characterize the thermally induced phase transitions and obtain polymer phase thickness as a function of time. ATDR can also provide information on membrane microstructure and is complementary to information obtained through electron micrography. Finally, the investigators seek to use analogies to alloy solidification theories to model the TIPS process. The research will provide a better understanding of membranes formed through thermally induced phase separation processes. This should have a direct impact on membrane design and casting procedures to fine-tune pore distributions and membrane thickness. Application lie in a variety of membrane separation technologies adapted to the chemical, petroleum and pharmaceutical industries.