Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Effect of PVP on CO2/N2 Separation Performance of Self-crosslinkable P(GMA-g-PPG)-co-POEM) Membranes

자가가교형 P(GMA-g-PPG)-co-POEM) 분리막의 이산화탄소/질소 분리 성능에 대한 PVP의 영향

  • Kim, Na Un (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Park, Byeong Ju (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Park, Min Su (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kim, Jong Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 김나운 (연세대학교 화공생명공학과) ;
  • 박병주 (연세대학교 화공생명공학과) ;
  • 박민수 (연세대학교 화공생명공학과) ;
  • 김종학 (연세대학교 화공생명공학과)
  • Received : 2018.04.17
  • Accepted : 2018.04.26
  • Published : 2018.04.30
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Abstract

Global warming due to indiscriminate carbon dioxide emissions has a profound impact on human life by causing abnormal climate change and ecosystem destruction. As a way to reduce carbon dioxide emissions, in this study, we presented a polymeric membrane prepared by blending a self-crosslinkable P(GMA-g-PPG)-co-POEM (SP) copolymer and commercial polymer polyvinylpyrrolidone (PVP). As the content of PVP increased, it was observed that the gas permeance decreased and $CO_2/N_2$ selectivity increased. At 30 wt% PVP content, the $CO_2$ permeance of the membrane decreased from 72.9 GPU of pure SP polymer to 12.6 GPU, while $CO_2/N_2$ selectivity improved by 79% from 28.1 to 50.4. It results from the hydrogen bonding between the SP copolymer and PVP, leading to more compact structure of the polymer chains, which was confirmed by FT-IR, TGA, XRD and SEM analysis. Therefore, we suggest that the permeance and selectivity of the membranes can be easily adjusted as desired by controlling the PVP content in the SP/PVP polymer blend.

무분별한 이산화탄소 배출로 인한 지구온난화는 이상기후와 생태계 파괴 등을 초래함으로써 인간의 삶에 심각한 영향을 미치고 있다. 이러한 문제의 근본 원인인 이산화탄소 배출을 저감하는 방법으로 본 연구에서는 자가-가교 성질이 있는 P(GMA-g-PPG)-co-POEM) (SP) 공중합체와 상용 고분자인 polyvinylpyrrolidone (PVP)를 혼합하여 블렌드 고분자 분리막을 제조하는 방법을 제시하였다. PVP 함량에 따른 분리막의 이산화탄소/질소 투과 특성을 확인하였으며, PVP의 함량이 증가할수록 투과도는 감소하고 선택도는 증가하는 결과를 보였다. 특히 PVP 함량이 30 wt%인 경우, 투과도는 순수 SP 고분자의 $CO_2$ 투과도인 72.9 GPU에서 12.6 GPU로 감소하였으나, $CO_2/N_2$ 선택도는 28.1에서 50.4로 약 79% 증가하였다. 이는 SP 공중합체와 PVP 사이의 수소결합으로 인해 고분자 사슬이 더욱 조밀하게 배열되기 때문인 것으로 볼 수 있으며, 이를 FT-IR, TGA, XRD, SEM을 통해 분석하였다. 따라서, 본 연구에서는 SP/PVP 고분자 블렌드 내 PVP의 함량을 조절함으로써 분리막의 투과도 및 선택도를 손쉽게 조절할 수 있음을 확인하였다.

Keywords

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