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个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 精细化工全国重点实验室主任，教育部智能材料化工前沿科学中心执行主任，大连理工大学膜科学与技术研究开发中心主任
性别：女
毕业院校：中国科学院大连化物所
学位：博士
所在单位：化工学院
学科：化学工程. 膜科学与技术. 生物医学工程
联系方式：hgaohong@dlut.edu.cn
电子邮箱：hgaohong@dlut.edu.cn
Effects of solvent and nonsolvent diffusion velocities on the morphology of cellular polyetherimide membranes prepared using supercritical CO2 phase inversion
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论文类型：期刊论文
发表时间：2013-11-01
发表刊物：JOURNAL OF SUPERCRITICAL FLUIDS
收录刊物：SCIE、EI、Scopus
卷号：83
页面范围：6-14
ISSN号：0896-8446
关键字：Supercritical CO2; Membrane morphology; Diffusion velocity; Cellular pore; Pore size; Porosity
摘要：Mass transfer kinetics plays a dominant role in membrane morphology. In this study, the effects of polymer concentration, supercritical CO2 (ScCO2) pressure and temperature on the morphology of polyetherimide (PEI) membranes prepared using ScCO2 phase inversion were investigated from the view of the instantaneous velocity of ScCO2 in-diffusion and the difference between average solvent out-diffusion velocity ((V) over bar (o)) and average ScCO2 in-diffusion velocity ((V) over bar (i)) through the interface between the casting solution and ScCO2, (V) over bar (o)-(V) over bar (i). The high instantaneous velocity of ScCO2 in-diffusion at the moment of onset of phase separation led to a cellular pore structure in the membrane. In addition, the dramatic decrease in the (V) over bar (o)-(V) over bar (i) resulted in the increased trends of pore size and porosity of the membrane with the increases in polymer concentration, ScCO2 pressure and temperature. (C) 2013 Elsevier B.V. All rights reserved.