Article
  • Synthesis and Properties of Polyurethane/Clay Nanocomposites Containing Siloxane Segment
  • Lee JE, Kim HJ
  • 실록산 세그먼트를 가진 폴리우레탄/점토 나노복합체의 제조 및 물성에 관한 연구
  • 이정은, 김형중
Abstract
Montmorillonite (MMT) modified with siloxane diamine was reacted with a reactant obtained from 4,4'-diphenyl methane diisocyanate (MDI) and polyester type polyol, Nippollan 4010 (Mn 2000). Finally, polyurethane (PU)/MMT composites were prepared by using 1,4-butane diol as a chain extender in 25 wt% solution of N,N-dimethyl acetamide (DMAc). It was expected that these nanocomposites had superior exfoliation property to that of MMT dispersed polyurethanes produced by simple mixing due to insertion of siloxane main chain to the silicate interlayer of MMT. Extent of reaction and formation of final products were analysed by using FT-IR spectroscopy. DIspersion into the PU and intercalation of MMT were identified by applying X-ray diffraction (XRD) and transmission electron microscopy (TEM). Tensile data were acquired by universal test machine (UTM). Thermal stability and variation of surface energy were characterized by thermal gravimetric analysis (TGA) method and measurement of contact angle on the synthesized composites, respectively. As the results the organo-MMT modified with siloxane diamine in the PU composites has an intercalated structure relatively well-expanded rather than a completely exfoliated structure. The tensile strengths and the moduli for the PU/organo-MMT composites were drastically enhanced in comparison to those of PU/Na+ -MMT composites.

4,4'-디페닐 메탄 디이소시아네이트(MDI)와 폴리에스테르 타입 폴리올인 Nippollan4010®(Mn 2000)을 반응 시킨 후, 실록산 디아민으로 유기화된 MMT를 반응시킨 다음 1,4-부탄디올을 사슬연장하여 디메틸아세트아미드(DMAc)내에서 고형분 25 wt%로 조정한 후 폴리우레탄/MMT 나노복합체를 합성하였다. 이러한 나노복합체는 점토의 실리케이트 층간에 실록산 주사슬들이 효과적으로 삽입된 형태를 가짐으로써 단순히 혼합되어 분산된 경우보다 박리 효과가 우수할 것으로 예상할 수 있다. 실험 중 반응 정도는 FT-IR로 확인하였으며, 분산 및 박리정도는 X-선회절(XRD)와 투과 전자 현미경(TEM)으로 관찰하였으며, 인장강도는 UTM을 이용하여 측정하였다. 열적 성질은 열무게 분석(TGA)을 이용하였으며, 그 외 접촉각을 측정하여 표면에너지의 변화를 확인하여 보았다. XRD와 TEM 분석 결과 폴리우레탄/친유성 MMT 나노복합체에 분산된 MMT는 층간 간격이 어느 정도 증가된 삽입된 구조로 되어 있는 것으로 밝혀졌다. 폴리우레탄/친유성 MMT 나노복합체의 인장강도와 탄성률은 폴리우레탄/Na+-MMT 나노복합체의 그것보다 월등히 증가하였다.

Keywords:

  • 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

  • 2005; 29(2): 177-182

    Published online Mar 25, 2005

  • 10.7317/pk.
  • Received on Dec 11, 2004
  • Revised on Nov 30, -0001
  • Accepted on Mar 9, 2005

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