Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Properties of Eco-friendly Acrylic Resin/Clay Nanocomposites Prepared by Non-aqueous Dispersion (NAD) Polymerization

비수계 분산중합으로 제조된 환경친화성 아크릴수지/나노클레이 복합재료의 특성 연구

  • Kim, Yeongho (Department of Chemical Engineering, University of Suwon) ;
  • Lee, Minho (Department of Chemical Engineering, University of Suwon) ;
  • Jeon, Hyeonyeol (Center for Materials Architecturing, Korea Institute of Science and Technology) ;
  • Lee, Young Chul (Green Process and Material R&D Group, Korea Institute of Industrial Technology) ;
  • Min, Byong Hun (Department of Chemical Engineering, University of Suwon) ;
  • Kim, Jeong Ho (Department of Chemical Engineering, University of Suwon)
  • 김영호 (수원대학교 화학공학과) ;
  • 이민호 (수원대학교 화학공학과) ;
  • 전현열 (한국과학기술연구원 물질구조제어단) ;
  • 이영철 (한국생산기술연구원 그린공정소재연구실용화그룹) ;
  • 민병훈 (수원대학교 화학공학과) ;
  • 김정호 (수원대학교 화학공학과)
  • Received : 2015.03.30
  • Accepted : 2015.05.19
  • Published : 2016.02.01
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Abstract

Eco-friendly acrylic resin/clay nanocomposites containing pristine montmorillonite (PM) or modified clays (30B and 25A) were prepared from acrylic and styrenic monomers using non-aqueous dispersion (NAD) polymerization. Effect of nanoclays on physical properties of polymerization product and resulting nanocomposites was investigated. In view of NAD particle stability, addition of nanoclay at the beginning of polymerization is proved to be good. Results of gel fraction, acid value and viscosity of the NAD product showed that nanocomposites containing clay 25A showed better physical properties than the ones with other clays. GPC results exhibit the increase in molecular weight and decrease in polydispersity index for the 25A nanocomposite. Increase in layer distance confirmed from XRD analysis showed good dispersion of 25A in the nanocomposite. Thermal and dynamic mechanical analysis showed that highest glass transition temperature and storage modulus for 25A nanocomposites. These results indicate that 25A nanoclay gives the best properties in the process of non-aqueous dispersion polymerization of acrylic resin/nanoclay nanocomposites.

본 연구에서는 아크릴과 소량의 스티렌 모노머에 나노클레이인 순수한 몬모릴로나이트(Pristine monmorillonite: PM) 또는 개질된 몬모릴로나이트(30B 또는 25A)를 첨가한 후 비수계 분산(NAD) 중합에 의해 환경친화성 아크릴/나노클레이 NAD수지 복합재료를 제조하고 나노클레이가 이 NAD 수지의 중합물성 및 복합재료의 물리적 물성에 주는 영향에 대해 연구하였다. 중합 후의 NAD 수지의 입자 균일성 측면에서 나노클레이는 초기에 안정제와 함께 투입하는 것이 유리하였고 중합된 NAD수지의 고형분, 산가, 점도 결과에서는 유기화제로 개질된 25A를 첨가할 경우가 다른 나노클레이를 첨가할 경우보다 좋은 물성을 주는 것으로 나타났다. 25A첨가 NAD수지는 GPC 측정시 분자량의 증가와 다분산지수의 감소로도 좋은 물성이 확인되었다. 나노클레이 25A가 수지내에 잘 분산된 것은 XRD결과에서 나노클레이의 층간거리 증가로 확인 되었고 열적 물성 측정 결과와 동적 기계적 물성 측정에서도 나노클레이 25A를 포함한 NAD 수지의 유리전이온도가 가장 높게 나타났으며 저장 탄성율 또한 25A경우가 가장 우수한 것으로 관찰되었다. 따라서 비수계 분산중합에 의해 아크릴/나노클레이 NAD수지를 제조할 경우에는 나노클레이로 25A를 첨가하는 것이 가장 좋은 물성을 얻을 수 있음을 확인할 수 있었다.

Keywords

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