Effects of residual solvent on gas separation properties of polyimide membranes

被引：38

作者：

Fu, Ywu-Jang ^{[2
]}

Hu, Chien-Chieh ^{[1
]}

Qui, Hsuan-zhi ^{[3
,4
]}

Lee, Kueir-Rarn ^{[3
,4
]}

Lai, Juin-Yih ^{[3
,4
]}

机构：

[1] Nanya Inst Technol, Dept Chem & Mat Engn, Chungli 32034, Taiwan

[2] Vanung Univ, Dept Biotechnol, Chungli 32023, Taiwan

[3] Chung Yuan Christian Univ, Res & Dev Ctr Membrane Technol, Chungli 32023, Taiwan

[4] Chung Yuan Christian Univ, Dept Chem Engn, Chungli 32023, Taiwan

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2008年 / 62卷 / 01期

关键词：

residual solvent; gas separation; polyimide membranes; free volume;

D O I：

10.1016/j.seppur.2008.01.008

中图分类号：

TQ [化学工业];

学科分类号：

0817 [化学工程与技术];

摘要：

The main aim of this study was to determine the effects of residual solvent on the gas sorption and transport properties of polyimide dense membranes. For this purpose, the membranes were made by casting a solution of polyimide on glass plates, followed by treatment at 25 and 150 degrees C for different periods of time. The membranes obtained were characterized by UV/vis scanning spectrophotometry, dynamic mechanical analysis, differential scanning calorimetry, and positron annihilation lifetime spectroscopy. The permeability and solubility coefficients of the membranes were determined at 35 degrees C by permeametry and microbalance measurements, respectively. They were found to be dependent on the amount of residual solvent in the membranes. The results show that the permeability, solubility, and diffusivity of polyimide membranes increase with increasing amounts of residual solvent. The difference in separation behavior is derived from changes in small molecular segment motion, free-volume hole size, and free-volume distribution. For membranes with low residual solvent content, separation performance could be affected significantly by antiplasticization; however, for membranes with higher residual solvent content, the dominant factor is plasticization. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：175 / 182

页数：8

共 35 条

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Gas and vapor sorption, permeation, and diffusion in glassy amorphous teflon AF1600 [J].