• Intercalation of Polycarbonate/Montmorillonite Nanocomposites
  • Lee YH, Hong SK, Yoon KS, Choi I, Lee SG, Lee JH, Choi KY
  • 폴리카보네이트와 몬모릴로나이트 나노복합체의 층간삽입
  • 이양훈, 홍성권, 윤광수, 최일석, 이성구, 이재흥, 최길영
Abstract
Polycarbonate(PC)/montmorillonite (MMT) nanocomposites were prepared by solution and melt mixing methods. A d-spacing of the nanocomposites was measured by an X-ray diffractometer. Neat montmorillonite (MMT. Na) and MMTs modified by dodecyl ammonium (MMT. DA) or dimethyl hydrogenated tallow 2-ethylhexyl ammonium (MMT-25A) were used. The d-spacing value of PC/MMT-25A and PC/MMT-DA was higher than that of PC/MMT-Na. The d-spacing increased from around 12 to 37 Å depending on the mixing method. PC was more readily introduced to the gallery of MMT as the molecular weight of PC reduced and the mixing time increased. PC/MMT-25A showed higher thermal stability by thermogravimetric analysis (TGA) than PC/MMT-DA and PC/MMT-Na.

폴리카보네이트 (PC)와 몬모릴로나이트 (montmorillonite, MMT)의 나노복합체를 용액 및 용융 혼합 방법으로 층간삽입시켜 제조하여 X.ray 실험으로 MMT의 층간간격 변화를 조사하였다. MMT로는 Na+를 양이온으로 갖는 순수 MMT (MMT.Na)와 도데실암모늄 (MMT. DA) 및 dimethyl hydrogenated tallow 2. ethylhexyl ammonium으로 개질된 MMT (MMT. 25A)를 사용하였다. PC/MMT. 25A와 PC/MMT. DA가 PC/ MMT. Na보다 층간거리의 증가폭이 컸으며, 혼합방법에 따라 최대 37 Å까지 층간간격이 증가하였다. 또, PC의 분자량이 작을수록, 혼합시간이 증가할수록 삽입이 잘 일어났다. 열중량분석법 (TGA)으로 측정한 열안정성은 PC/MMT. 25A가 PC/MMT. Na와 순수한 PC보다 우수함을 나타내었다.

Keywords: nanocomposite; polycarbonate; montmorillonite; intercalation; thermal stability

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This Article

  • 2001; 25(6): 818-825

    Published online Nov 25, 2001

  • Received on Apr 6, 2001