Article
  • Gas Permeation Properties of Sulfonated 6FDA-Based Polyimide Membranes Exchanged with Metal Ions
  • Im HS, Lee BS, Lee BS, Yoon SW, Koh HC, Lee CS, Ha SY, Cheong SI, Rhim JW
  • 금속이온이 치환된 설폰화된 6FDA계 폴리이미드 막의 기체 투과 특성
  • 임현수, 이병성, 이보성, 윤석원, 고형철, 이충섭, 하성용, 정성일, 임지원
Abstract
Sulfonic acid of the sulfonated 6FDA-based polyimides were exchanged with the monovalent (Li+, Na+ and K+) and divalent (Mg2+, Ca2+ and Ba2+) ions. The effect of metal cations exchanged sulfonated polyimides was investigated in terms of gas permeability and selectivity for CO2, O2 and N2 gases. Thermogravimetric analysis showed that thermal stability of sulfonated polyimide was improved by exchanged metal cations. The permeabilities of monovalent cation-exchanged, sulfonated polyimide were reduced as the ion radius reduced [Li+(0.059 nm)>Na+(0.102 nm)>K+(0.138 nm)], and those of divalent cations exchanged were determined by the ionic radii and electrostatic crosslinking between the polymer and metal cations, whereas the selectivities of all the metal cation-exchanged, sulfonated polyimides for CO2/N2 and O2/N2 were higher than those of sulfonated polyimide membranes. The sulfonated polyimide exchanged with the potassium cation showed the O2 permeability of 89.98 Barrer [1×10^(-10) cm3(STP) cm/cm2ㆍsㆍcmHg] and the sulfonated polyimide exchanged with the lithium cation showed the O2/N2 selectivity of 12.9.

설폰화된 6FDA 계열의 폴리이미드의 설폰산기에 1가 이온(Li+, Na+, K+)과 2가 이온((Mg2+, Ca2+, Ba2+)이 치환되어졌으며, 이러한 금속이온의 치환효과가 CO2, O2 및 N2 등의 기체 투과도와 선택도에 미치는 영향에 대하여 조사하였다. 설폰화된 폴리이미드의 열적 안정성이 금속이온을 치환함으로써 향상된 것을 열중량기 분석을 통하여 확인되었다. 1가 이온으로 치환된 막의 투과도는 이온반경 [Li+(0.059 nm)>Na+(0.102 nm)>K+(0.138 nm)]의 순서로 감소하며, 2가 이온의 경우 이온반경과 고분자와 금속이온 간의 전기적 가교로 인하여 결정되어짐을 알 수 있었다. 반면에, 금속이온으로 치환된 설폰화된 폴리이미드 막의 선택도는 치환되지 않은 막에 비하여 향상된 것을 알 수 있었다. K+ 이온으로 치환된 설폰화된 폴리이미드 막의 산소 투과도는 89.98 Barrer[1×10^(-10) cm3(STP) cm/cm2ㆍsㆍcmHg]을 나타내어 원래의 폴리이미드 막의 산소 투과도인 126.5 Barrer 보다 현저히 줄었으며, Li+으로 치환된 막의 O2/N2 선택도는 12.9를 나타내어 원래의 4.2보다 크게 향상되어졌다.

Keywords: gas separation; metal ions; sulfonation; 6FDA-DAM; polyimide

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2009; 33(6): 555-560

    Published online Nov 25, 2009

  • Received on May 26, 2009
  • Accepted on Jul 13, 2009