Special Issue
  • Investigation of Tensile Properties in Edge Modified Graphene Oxide(E-GO)/Epoxy Nano Composites

  • Donghyeon Lee*, Ga In Cho**, Hyung Mi Lim***, Mantae Kim***† , Dong-Jun Kwon*,**,****†

  • * Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Korea
    ** School of Materials Science & Engineering Major in Polymer Engineering, Gyeongsang National University, Jinju, Korea
    *** Aerospace Convergence Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, Korea
    **** Aerospace Convergence Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, Korea
    ***** Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju, Korea,

  • 측면 치환 그래핀/에폭시 나노복합재료의 인장 특성 평가

  • 이동현* · 조가인** · 임형미*** · 김만태***† · 권동준*,**,****†

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Graphene oxide (GO), known for its high stiffness, thermal conductivity, and electrical conductivity, is being utilized as a reinforcement in nanocomposite materials. This study evaluates the mechanical properties of epoxy nanocomposites incorporating GO and edge modified GO (E-GO), which has hydroxyl groups substituted only on its edges. GO/E-GO was uniformly dispersed in epoxy resin using ultrasonic dispersion, and mechanical properties were assessed through tensile testing. The results showed that the addition of nanoparticles increased both tensile strength and toughness. The tensile strength of the epoxy without nanoparticles was 74.4 MPa, while the highest tensile strength of 90.7 MPa was observed with 0.3 wt% E-GO. Additionally, the modulus increased from 2.55 GPa to 3.53 GPa with the addition of nanoparticles. Field emission scanning electron microscopy of the fracture surface revealed that the growth of cracks was impeded by the nanoparticles, preventing complete fracture and causing the cracks to split in multiple directions. E-GO, with surface treatment only on the edges, exhibited higher mechanical properties than GO due to its superior dispersion and surface treatment effects. These results highlight the importance of nanoparticle surface treatment in developing high-performance nanocomposite materials.


그래핀 옥사이드(graphene oxide, GO)는 높은 강성, 열전도도 및 전기전도도를 가지고 있기 때문에 나노복합재료의 강화재로 적용되고 있다. 본 연구는 GO와 측면 부분에만 수산화기로 치환된 GO (E-GO)를 에폭시 나노복합재료에 적용하여 기계적 물성을 평가하였다. 초음파 분산법을 통하여 에폭시 수지에 GO/E-GO를 균일하게 분산시켰고, 인장 시험을 통하여 기계적 물성을 평가하였다. 나노입자를 첨가함에 따라 인장강도와 인성이 높아지는 것을 확인하였다. 나노 입자를 첨가하지 않은 에폭시의 인장강도는 74.4 MPa이고, E-GO를 0.3 wt% 첨가되었을 때 90.7 MPa로 가장 높은 인장강도 값을 나타내었다. 모듈러스 또한 2.55 GPa에서 나노입자의 첨가에 따라 3.53 GPa까지 증가하는 것을 확인할 수 있었다. 전계방사 주사전자현미경을 통하여 파단면을 관찰하였을 때 균열의 성장이 나노 입자에 의하여 저지되며 파단까지 이어지지 못하고, 여러 방향으로 나뉘는 현상을 보였다. 측면 부분에만 표면처리가 일어난 E-GO에서는 높은 분산도와 표면처리에 의하여 GO보다 높은 기계적 물성을 보였다. 이러한 결과를 통하여 고성능 나노복합재료의 개발을 위하여 나노 입자의 표면처리의 중요성을 확인할 수 있다.


Keywords: 나노복합재료(Nanocomposite), 그래핀 옥사이드(Graphene oxide), 에폭시(Epoxy), 분산(Dispersion)

This Article

Correspondence to

  • Mantae Kim*** , Dong-Jun Kwon*, **, ****

  • * Department of Materials Engineering and Convergence Technology, Gyeongsang National University, Jinju, Korea
    ** School of Materials Science & Engineering Major in Polymer Engineering, Gyeongsang National University, Jinju, Korea
    **** Aerospace Convergence Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju, Korea
    ***** Research Institute for Green Energy Convergence Technology, Gyeongsang National University, Jinju, Korea,

  • E-mail: ginggiscan@kicet.re.kr, djkwon@gnu.ac.kr