Article
  • Gas Permeation Characteristics of Dried Asymmetric Cellulose Acetate Membranes by i-PrOH Exchange Treatment with the Variation of Acetone Evaporation Time
  • Kim BS, Nam ST, Choi SB
  • Isopropanol로 치환 건조된 비대칭 Cellulose Acetate막의 아세톤 증발 시간 변화에 따른 기체투과특성
  • 김병식, 남석태, 최성부
Abstract
The structural changes of cellulose acetate membranes with the variation of acetone evaporation time and the gas permeation characteristics of He, N2 and O2 for those membranes were examined. The dried cellulose acetate membrane by isopropanol exchange treatment represented asymmetric structure which consists of a skin layer and a support layer. By changing the solvent evaporation time, the thickness of the membrane skin layer increased for the first 2 minutes, and then decreased gradually. The gas permeation rate depended on the thickness of skin layer and it was in the order of He>N2O22. The permeation mechanism appears to be the combination of Knudsen flow and viscous flow. The effect of Knudsen flow was increased with acetone evaporation time. At 9 minutes of evaporation time, αHe/N2 was about 1.90.

본 연구에서는 용매증발시간을 변화시켜 제조한 i-PrOH 치환 건조된 cellulose acetate 막에서 용매증발시간에 따른 막의 구조변화 및 기체(He, N2, O2)의 투과성능을 평가하였다. i-PrOH 치환 건조된 cellulose acetate 막구조는 비대칭구조를 나타내었으며 용매증발시간 2분을 전후하여 skin층의 두께는 증가하다가 감소하였다. 기체투과속도는 skin층의 두께변화에 따라 크게 의존하였고, 투과계수의 크기는 He>N2 O2 순으로 나타났다. 한편 기체투과기구는 Knudsen flow와 viscous flow의 혼합형태를 나타내었으며, 증발시간이 커질수록 Knudsen flow의 영향이 증가하였다. 증발시간 9분일때 αHe/N2는 1.9이었다.

  • 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

  • 1989; 13(5): 433-441

    Published online Jun 25, 1989