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Received March 30, 2015
Accepted May 19, 2015
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비수계 분산중합으로 제조된 환경친화성 아크릴수지/나노클레이 복합재료의 특성 연구
Properties of Eco-friendly Acrylic Resin/Clay Nanocomposites Prepared by Non-aqueous Dispersion (NAD) Polymerization
1수원대학교 화학공학과, 18323 경기도 화성시 봉담읍 와우안길 17 2한국과학기술연구원 물질구조제어단, 02792 서울시 성북구 화랑로 14길 5 3과학기술연합대학원대학교 나노재료공학과, 34113 대전광역시 유성구 가정로 217 4한국생산기술연구원 그린공정소재연구실용화그룹, 31056 충청남도 천안시 서북구 입장면 양대기로길 89
1Department of Chemical Engineering, University of Suwon, 17, Wauan-gil, Bongdam-eup, Hwaseong, Gyeonggi, 18323, Korea 2Center for Materials Architecturing, Korea Institute of Science and Technology, 5, Hwarangno 14-gil, Seongbuk-gu, Seoul, 02792, Korea 3Nanomaterials Science and Engineering, University of Science and Technology, 217, Gajung-ro, Yuseong-gu, Daejeon, 34113, Korea 4Green Process and Material R&D Group, Korea Institute of Industrial Technology, 89, Yangdaegiro-gil, Ipjang-myeon, Seobuk-gu, Cheonan, Chungnam, 31056, Korea
jhkim@suwon.ac.kr
Korean Chemical Engineering Research, February 2016, 54(1), 120-126(7), 10.9713/kcer.2016.54.1.120 Epub 12 February 2016
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Abstract
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 NAD수지는GPC 측정시 분자량의 증가와 다분산지수의 감소로도 좋은 물성이 확인되었다. 나노클레이25A가 수지내에 잘 분산된 것은XRD결과에서 나노클레이의 층간거리 증가로 확인 되었고 열적 물성 측정 결과와 동적 기계적 물성 측정에서도 나노클레이25A를 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.
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.
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