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The Membrane Society of Korea (한국막학회)
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Characterization of PVDF-DBP Materials for Thermally Induced Phase Separation

열유도상분리법 적용을 위한 PVDF-DBP 소재의 특성평가

  • Kim, Se Jong (Department of materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University) ;
  • Lee, Jeong Woo (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)
  • 김세종 (경상대학교 나노신소재융합공학과) ;
  • 이정우 (경상대학교 나노신소재융합공학과) ;
  • 남상용 (경상대학교 나노신소재융합공학과)
  • Received : 2016.12.18
  • Accepted : 2016.12.22
  • Published : 2016.12.31
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Abstract

In this study, polyvinylidene fluoride (PVDF) membrane with excellent mechanical properties and chemical resistance was prepared and characterized for the application of water treatment. Dibutyl-phthalate (DBP) was used as a diluent for making a membranes through temperature induced phase separation (TIPS) method, and the crystallization temperature, melting point, cloud point and SEM image were observed with different ratio of diluent in polymer/diluent mixture. The crystallization temperature and melting point increased proportionally with the content of polymer, while the cloud point temperature decreased. Finally, it was confirmed that stable membrane could be manufactured at a polymer content of 62 wt% and a temperature $125^{\circ}C$ using the phase diagram of PVDF/DBP mixtures with temperatures.

본 연구에서는 수처리 분리막의 적용을 위하여 기계적 물성과 내화학성이 우수한 poly(vinylidene fluoride)(PVDF)의 특성평가를 진행하였다. 열유도상분리법을 통한 분리막을 제조하기 위하여 사용된 희석제는 dibutyl-phthalate(DBP)를 사용하였으며, 고분자와 희석제의 비율에 따른 결정화 온도, 녹는점, 흐림점, SEM 이미지 등을 관찰하였다. 고분자의 함량이 높아질수록 결정화 온도 및 녹는점은 높아졌으며 반대로 흐림점 온도는 낮아짐을 확인하였다. 최종적으로 상평형도 작도를 통하여 고분자함량 62 wt%, 제막 온도 $125^{\circ}C$ 이상에서 안정적인 분리막이 제조 가능함을 확인할 수 있었다.

Keywords

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