Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Gas Permeation Properties of PEO/EVA/MWCNT Composite Membranes

PEO/EVA/MWCNT 복합막을 통한 기체투과 성질

  • Kang, Min Ji (Department of Industrial Chemistry, Sangmyung University) ;
  • Hong, Se Ryeong (Kyedang College of General Education Studies, Sangmyung University)
  • 강민지 (상명대학교 공업화학과) ;
  • 홍세령 (상명대학교 계당교양교육원)
  • Received : 2018.04.24
  • Accepted : 2018.06.28
  • Published : 2018.10.10
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Abstract

In this study, polyethylene oxide (PEO)/polyethylene-co-vinyl acetate (EVA)/multi-walled carbon nanotube (MWCNT)-COOH composite membranes were prepared by adding 1, 2, 3, and 5 wt% of MWCNT-COOH to PEO/EVA respectively. The gas permeation properties of $N_2$, $O_2$ and $CO_2$ at $30^{\circ}C$ and 4~8 bar pressure were investigated. In each PEO/EVA/MWCNT-COOH composite membranes, the permeability of $CO_2$ increased with increasing the pressure, but the permeability of $N_2$ and $O_2$ were independent of the feeding pressure. As the MWCNT-COOH content increased, the $CO_2$ permeability increased and then decreased above 2 wt% MWCNT-COOH content. The 2 wt% MWCNT-COOH composite membrane exhibited a $CO_2/N_2$ selectivity of 77.8 and a $CO_2$ permeability of 84 barrer at 8 bar. The high $CO_2/N_2$ selectivity and $CO_2$ permeability were due to the high affinity between the quadrupolar $CO_2$, polar ether groups of PEO, and the polar ester groups of EVA. Additionally, the strong affinity between $CO_2$ and the -COOH groups on the MWCNT surface contributed to the high permeability of $CO_2$.

본 연구에서는 PEO [poly(ethylene oxide)]/EVA [poly(ethylene-co-vinyl acetate)]에 MWCNT (multi-walled carbon nanotube)-COOH 1, 2, 3, 5 wt% 첨가하여 PEO/EVA/MWCNT-COOH 복합막을 제조하였다. 그리고 복합막에 대해 $30^{\circ}C$, 4~8 bar의 압력에서 $N_2$, $O_2$, $CO_2$의 기체투과 성질을 조사하였다. 각 PEO/EVA/MWCNT-COOH 복합막들에서 $CO_2$의 투과도는 압력 증가에 따라 증가하였고, $N_2$와 $O_2$는 압력에 거의 변화를 받지 않았다. 그리고 MWCNT-COOH 함량이 증가하면서 $CO_2$ 투과도가 증가하다가 2 wt% MWCNT-COOH 함량이상에서 감소하였는데 2 wt% MWCNT-COOH 복합막은 8 bar에서 $CO_2/N_2$ 선택도 77.8과 $CO_2$ 투과도 84 barrer를 나타내었다. 높은 $CO_2/N_2$ 선택도와 $CO_2$ 투과도는 사극자 $CO_2$와 PEO 내의 극성 에테르기, EVA의 극성 에스터기와 함께 MWCNT 표면의 -COOH기 간의 높은 친화력 때문이다.

Keywords

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