• Synthesis and Characterization of Organo-Clay Based Thermotropic Liquid Crystalline Polyester Nanocomposites
  • Seo BS, Chang JH
  • 유기화 점토를 이용한 열방성 액정 폴리에스테르 나노복합재료의 합성과 특성 연구
  • 서보수, 장진해
Abstract
A thermotropic liquid crystalline polyester (TLCP) containing a side group was synthesized from ethoxyhydroquinone and bromoterephthalic acid. Intercalation of TLCP in layered clays is accomplished by heating the polymer with hexadecyl ammoniummontmorillonite (C16-MMT) above melting transition temperature (Tm). Liquid crystallinity of the TLCP/C16-MMT hybrid was observed up to 6 wt% C16-MMT. Some of the C16-MMTs in TLCP were highly dispersed in a nanometer scale, but some of them were agglomerated. Thermal and morphological properties of the nanocomposites were examined by differential scanning calorimetry (DSC), thermogravimetric analyzer (TGA), polarized optical microscope, and electron microscopes (SEM and TEM).

에톡시히드로퀴논과 브로모 테레프탈산을 사용하여 용액 중합법으로 네마틱 액정 상을 가지는 열방성 액정 고분자를 합성하였다. 합성된 헥사데실-몬모릴로나이트 (C16-MMT)를 액정 고분자의 용융 전이온도 이상에서 매트릭스 고분자에 대해 여러 wt%로 조성을 변화시키면서 나노복합재료를 만들었다. C16-MMT가 액정 고분자에 대해 2 wt%만 첨가되어도 열적 성질이 크게 증가하였으며 이후로 C16-MMT가 증가함에 따라 일정하게 증가하였다. 유기화 점토가 2에서 6 wt%까지 증가되어도 액정 상은 파괴되지 않고 그대로 유지되었다. X-ray 회절도의 결과, 첨가된 C16-MMT의 일부는 TLCP에 잘 분산되었으나, 일부는 뭉쳐진 형태로 존재하였으며 첨가된 C16-MMT의 양이 증가할수록 뭉침이 증가되었다. 합성된 나노복합재료의 열적 성질과 몰폴로지는 시차주사 열분석기(DSC), 열중량 분석기(TGA), 편광 현미경, 그리고 전자 현미경(SEM, TEM) 등을 이용하여 분석하였다.

Keywords: thermotropic LCP; montmorillonite; C16-MMT; organo-clay; nanocomposite

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This Article

  • 2001; 25(6): 876-883

    Published online Nov 25, 2001

  • Received on Aug 14, 2001