RESEARCH ARTICLE

Calculation on phase diagrams of polyetherimide/ N,N-dimethylacetamide/H2O-BuOH casting system and their relevance to membrane performances

  • Ming TAN 1,2 ,
  • Gaohong HE , 1 ,
  • Yan DAI 1 ,
  • Rujie WANG 1 ,
  • Wenhua SHI 1
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  • 1. State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
  • 2. Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China

Received date: 15 Sep 2013

Accepted date: 15 Feb 2014

Published date: 11 Oct 2014

Copyright

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg

Abstract

The ternary phase diagrams of polyetherimide (PEI)/N,N-dimethylacetamide (DMAc) with H2O and BuOH as non-solvent were simulated using solubility parameter and Flory-Huggins theory. The phase diagrams show that 5.5% H2O/BuOH system containing 5% BuOH and 0.5% H2O, or 6.5% H2O/BuOH system containing 6.2% BuOH and 0.3% H2O is required to induce liquid-liquid demixing for 20 wt-% PEI/DMAc casting solution. Therefore, BuOH can enhance the phase separation of the PEI casting solution and hereby induce higher porosity of the membrane, and the diffusion of BuOH into the water coagulation bath causes larger pore size easily compared with DMAc. Our predictions that the membrane pure water flux first increases then decreases, and the rejection ratio of bovine serum albumin decreases with the increasing concentration of BuOH were validated by the experiments using the prepared membranes.

Cite this article

Ming TAN , Gaohong HE , Yan DAI , Rujie WANG , Wenhua SHI . Calculation on phase diagrams of polyetherimide/ N,N-dimethylacetamide/H2O-BuOH casting system and their relevance to membrane performances[J]. Frontiers of Chemical Science and Engineering, 2014 , 8(3) : 312 -319 . DOI: 10.1007/s11705-014-1434-x

Acknowledgements

The authors thank the financial support of National Science Fund for Distinguished Young Scholars of China (21125628), the National High Technology Research and Development Program of China (2012AA03A611), Science and Technology plan projects of Liaoning Province of China (2011224005) and the Fundamental Research Funds for the Central Universities (DUT11ZD112).
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