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Preparation and Characterization of Organic Solvent-resistant Polybenzimidazole Membranes

용매저항성 폴리벤즈이미다졸 분리막의 제조 및 특성평가

  • Jeong, Moon Ki (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University) ;
  • Nam, Sang Yong (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University)
  • 정문기 (경상대학교 나노신소재융합공학과, 공학연구원) ;
  • 남상용 (경상대학교 나노신소재융합공학과, 공학연구원)
  • Received : 2017.02.21
  • Accepted : 2017.04.07
  • Published : 2017.08.10

Abstract

Recently, solvent-resistant nanofiltration membranes have been studied for the separation of solvents or solutes using a molecular weight cut-off system of the polymer which is resistant to a specific solvent. Required conditions for these membranes must have are excellent physical properties and solvent resistance. Polybenzimidazole, which is known to be one of the most heat-resistant commercially available polymers, has an excellent inherent solvent resistance and it is even insoluble in stronger organic solvents when cross-linked. Therefore, in this study, the applicability of polybenzimidazole as a solvent resistant nanofiltration membrane was discussed. The membrane was fabricated using the non-solvent induced phase separation method and showed a suitable morphology as a nanofiltration membrane confirmed by field emission scanning electron microscopy. In addition, the permeance of the solvent in the presence or absence of cross-linking was investigated and the stability was also confirmed through long operation. The permeance test was carried out with five different solvents: water, ethanol, benzene, N, N-dimethylacetamide (DMAc) and n-methyl-2-pyrrolidone (NMP); each of the initial flux was $6500L/m^2h$ (water, 2 bar), $720L/m^2h$ (DMAc, 5 bar), $185L/m^2h$ (benzene, 5 bar), $132L/m^2h$ (NMP, 5 bar), $65L/m^2h$ (ethanol, 5 bar) and the pressure between 2 and 5 bar was applied depending on the type of membrane.

Acknowledgement

Supported by : 산업통상자원부

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