Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Effect of graphene oxide on mechanical characteristics of polyurethane foam

산화그래핀이 폴리우레탄 폼 기계적 강도에 미치는 영향

  • Kim, Jong-Min (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Kim, Jeong-Hyeon (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Choe, Young-Rak (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Park, Sung Kyun (Department of Physics, Pusan National University) ;
  • Park, Kang Hyun (Department of Chemistry, Pusan National University) ;
  • Lee, Jae-Myung (Department of Naval Architecture and Ocean Engineering, Pusan National University)
  • Received : 2016.03.07
  • Accepted : 2016.06.05
  • Published : 2016.07.31
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Abstract

In the present study, graphene oxide based polyurethane foams were manufactured as a part of the development process of mechanically strengthened polyurethane foam insulation material. This material is used in a liquefied natural gas carrier cargo containment system. The temperature of the containment system is $-163^{\circ}C$. First, graphene oxide was synthesized using the Hummers' method, and it was supplemented into polyol-isocyanate reagent by considering a different amount of graphene oxide weight percent. Then, a bulk form of graphene-oxide-polyurethane foam was manufactured. In order to investigate the cell stability of the graphene-oxide-polyurethane foam, its microstructural morphology was observed, and the effect of graphene oxide on microstructure of the polyurethane foam was investigated. In addition, the compressive strength of graphene-oxide-polyurethane foam was measured at ambient and cryogenic temperatures. The cryogenic tests were conducted in a cryogenic chamber equipped with universal testing machine to investigate mechanical and failure characteristics of the graphene-oxide-polyurethane foam. The results revealed that the additions of graphene oxide enhanced the mechanical characteristics of polyurethane foam. However, cell stability and mechanical strength of graphene-oxide-polyurethane foam decreased as the weight percent of graphene oxide was increased.

본 연구에서는 영하 $163^{\circ}C$의 극저온 환경에서 저장되는 액화천연가스 운반선 방열시스템에 적용되는 폴리우레탄 폼 단열재의 기계적 강도를 향상시키기 위한 연구의 일환으로 폴리우레탄 폼 합성 시 산화그래핀을 첨가한 산화그래핀-폴리우레탄폼을 개발하였다. 우선 Hummers 방법을 이용하여 산화그래핀을 합성하였으며, 폴리올과 이소시아네이트의 중합반응 시 산화그래핀의 중량비를 다르게 첨가하여 산화그래핀-폴리우레탄 폼 벌크를 제작하였다. 미세구조 분석을 통해 산화그래핀의 양에 의존한 산화그래핀-폴리우레탄 폼의 셀 안정성에 대해 분석 하였으며, 이와 동시에 산화그래핀이 폴리우레탄 폼 셀에 미치는 영향에 대해 분석하고자 하였다. 또한, 기계적 강도를 계측하기 위해 극저온용 챔버를 탑재한 만능재료시험기의 온도를 제어하여 상온 및 영하 $163^{\circ}C$의 극저온 환경에서 압축시험을 수행하여 기계적 거동 및 파손 특성에 대해 규명하였다. 시험 결과 산화그래핀의 양이 증가 할수록 기계적 강도는 향상되지만, 일정량 이상이 되면 셀형성을 방해하여 셀 구조의 안정성이 저하되고 기계적 강도 또한 저하되는 현상을 관찰하였다.

Keywords

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