• Title/Summary/Keyword: Polyetherimide

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Characterization of Phase Inversion Membrane of Sulfonated Polyetherimide (Sulfonated Polyetherimide Membrane의 특성)

  • 김완주;최남석;최중구;김인철;김종호;탁태문
    • Membrane Journal
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    • v.9 no.1
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    • pp.1-9
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    • 1999
  • Sulfonated polyetherimide having anionic charge and better hydrophilicity than polyetherimide was prepared by reacting polyetherimide with chlorosulfonic acid. To prepare casting solution, from which the membrane having good performance can produce. Polyvinylpyrrolidone as a pore forming agent and volatile weak solvent such as dichloromethane to foml the dense skin layer were added to the sulfonated polyetherimide / N -methyl-2-pyrrolidone solution. Membrane fabricated sulfonated PEl showed better fouling resistance to the protein than those fabricated PEL because of its hydrophilicity. Solute having negative charge was removed effectively with membrane fabricated from the sulfonated PEl because of its the same electron charge.

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Synthesis and Characterization of Sulfonated Polyetherimide (Sulfonated Polyetherimide 합성 및 특성)

  • 김완주;최남석;최중구;김인철;김종호;탁태문
    • Membrane Journal
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    • v.9 no.1
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    • pp.10-16
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    • 1999
  • In this study, polyetherimide with pellet state was sulfonated with a chlorosulfonic acid. The volume ratio of carbon tetrachloride (CCI$_4$/1,2-dichloroethane (DCE) was 5/1. Therefore, sulfonated polyetherimide of anionic charge and more hydrophilicity were produced. The optimum reaction conditions of sulfonation were that PES/CSA mole ratio was I/I, temperature were lO$^{\circ}$ and reaction time were 3hr. SPEls having ion capacity in the range of 0.2-1.2meq/mg were synthesized. Through FT-IR, sulfonic acid peak was shown at 1020cm$^{-1}$ and 1170cm$^{-1}$ Polymer dispersity index was broad and we confirmed that PEl was hydrophilzed in the measure of contact angle.

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상전이법에 의한 Polyetherimide 기체분리막 제조에서의 첨가제 효과에 관한 연구

  • 정용재;최성부;윤현희;김병식
    • Proceedings of the Membrane Society of Korea Conference
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    • 1997.10a
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    • pp.94-95
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    • 1997
  • 1. 서론 : Polyetherimide를 이용하여 기체분리용 고분자막을 제조하여 막 구조에 대한 첨가제 효과를 규명하고자 하였다. 막 제조는 상전환법에 기초한 습식방사법을 이용하여 Polyetherimide막을 제조하였다. 상전환법에 의한 막의 제조에 있어 막의 구조 및 투과성능은 사용되는 고분자용액의 농도 및 solvent의 종류 그리고 nonsolvent와 고분자 용액에 사용되는 첨가제와 밀접한 관계를 가지고 있다.

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Membrane Perfomance of Sulfonated Polyetherimide

  • 김완주;권영남;전종영;탁태문
    • Proceedings of the Membrane Society of Korea Conference
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    • 1996.10a
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    • pp.71-72
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    • 1996
  • Polyetherimide(PEI)계의 고분자는 막 성능이 우수하고 내열성과 내유기용매성 등이 우수한 열가소성수지로서 film, sheet, tubular형으로 만들 수 있어 한외여과막이나 역삼투막, 기체분리막 등에 이용되고 있다. 한편 투과속도를 높이고, fouling을 줄이기 위한 친수성 향상은 막 소재의 화학적 개질에 있어서 주된 목표이다. sulfonation은 막 재질의 소수성을 감소시켜 water permeability를 향상시키는데 있어서 매우 유용한 방법으로 이온교환수지, 이온교환막, anion형 하전막의 제조에 이용되어 왔다. 본 실험에서는 polyetherimide계 고분자를 chlorosulfonic acid(CSA)를 이용하여 술폰화시킨 sulfonated polyetherimide(SPEI)를 제조하여 막 성능을 측정하였다.

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Plasma Surface Modification of Electrospun PEI(polyetherimide) Web (전기방사된 PEI(polyetherimide) 웹의 플라즈마 표면개질)

  • 권미연;이승구;추보영;주창환
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.10b
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    • pp.126-129
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    • 2003
  • PEI(polyetherimide)는 고강도, 고탄성율를 가지며 20$0^{\circ}C$에서 연속사용이 가능한 고내열성, 내화학성을 가진 고성능 고분자이다. 우수한 물성과 더불어 성형성도 뛰어나 다양한 제품설계를 할 수 있으며, 특히 연소시 낮은 연기배출율(smoke emission)을 지니며, 고유의 우수한 난연성을 가지고 있다. 또한 광범위한 온도와 주파수대에서 높은 유전율과 전기 저항 특성을 유지할 수 있다. (중략)

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Spinning Characteristics of Polyetherimide Hollow Fiber Membrane for Gas Separation (기체분리용 polyetherimide 중공사막의 제막 특성)

  • 손원일;최성부;김수용;윤현희;김병식
    • Proceedings of the Membrane Society of Korea Conference
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    • 1998.10a
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    • pp.93-95
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    • 1998
  • 1. 서론 : 폴리이미드계 고분자는 기계적 성질과 내열성이 우수한 고분자 소재이다. 일반적으로 기체분리막으로서의 유리상 고분자는 기체의 투과성은 결여되지만, 고분자쇄의 동결속박에 의한 자유부피에 따라 기체의 선택성이 높게 나타난다. 본 연구에서는 고분자로서 polyetherimide(PEI) 를 이용하여 제막조건(고분자 농도, air gap, 용매, 내부응고제 주입량 등)을 달리하는 중공사막을 제조하여, 제막변수에 따른 막의 구조 및 기체투과 특성을 검토하였다.

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Pervaporation Separation of Water-isopropanol Mixtures through Modified Asymmetric Polyetherimide Membrane: the Effect of NaOH Concentration and Modification Reaction Times on the Morphology of the Morphology of the Modified Membranes (개질 비대칭 폴리에테르이미드막을 통한 물-이소프로판올 혼합물 투과증발 분리: NaOH용액의 농도와 개질반응 시간에 따른 몰폴로지 변화)

  • Kim, Sang-Gyun;Jegal, Jonggeon;Lee, Kew-Ho
    • Applied Chemistry for Engineering
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    • v.10 no.4
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    • pp.515-522
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    • 1999
  • Asymmetric polyetherimide membrane were prepared by phase inversion method, and the effects of NaOH concentration and reaction time on the morphology change of the polyetherimide membranes were studied. The morphology of skin layers varied from dense structure to sphere structure with increasing concentration of modification solution. The thickness of dense layer increased with increasing reaction time. However, when either the concentration of modifying solution was very high or the reaction time was very long, the dense layers of the asymmetric membrane were disappeared. From these results, it was found that the surface morphology of the asymmetric polyetherimide membranes depended strongly on the modification conditions such as concentration of modification solution and reaction time. These results might be explained by the hydrolysis reaction of polyetherimide into polyamic acid by the NaOH solution.

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Pervaporation Separation of Water-isopropanol Mixtures Through Modified Asymmetric Polyetherimide membranes: the Effect of NaOH Concentration for the Modification of Skin Layers on the Pervaporation Characteristics (개질 비대칭 폴리에테르이미드막을 통한 물-이소프로판올 혼합물의 투과증발 분리: 투과증발 특성에 미치는 표면층 개질에 사용된 NaOH 농도의 영향)

  • Kim, Sang-Gyun;Jegal, Jonggeon;Lee, Kew-Ho
    • Applied Chemistry for Engineering
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    • v.10 no.2
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    • pp.319-323
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    • 1999
  • Asymmetric polyetherimide membranes were prepared by phase inversion method. In the modification of the skin layers of polyetherimide membranes, the effects of NaOH concentration on the morphology and pervaporation separation of water-isopropanol mixtures were investigated. With increasing concentration of NaOH solution, polyamicacid structure was formed by the hydrolysis of imide group of polyetherimide, and the thickness of dense layer of the asymmetric membrane increased. In the pervaporation separation of water-isopropanol mixtures the overall permeation rate decreased and the separation factor increased with increasing concentration of NaOH solution. However, when the concentration of NaOH solution was very high, the permeation rate increased but separation factor decreased. From these results, it was found that the permeation behaviors of asymmetric polyetherimide membranes depended upon the concentration of NaOH solution. These modified membranes showed that both the permeation rate and separation factor increased as the operating temperature increased.

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