Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Evaluation of Wettability and Interfacial Property of Glass Fiber Reinforced Composite with Different Glass Fiber Conditions via Capillary Effect

Capillary 특성을 활용한 섬유 조건에 따른 유리섬유강화 복합재료의 함침성 및 계면강도 평가

  • Kim, Jong-Hyun (Department of Materials Engineering and Convergence Technology, Center for Creative Human Resource & Convergence Materials, Gyeongsang National University) ;
  • Kwon, Dong-Jun (Research Institute for Green Energy Convergence Technology, Gyeongsang National University) ;
  • Park, Joung-Man (Department of Materials Engineering and Convergence Technology, Research Institute for Green Energy Convergence Technology, Gyeongsang National University)
  • Received : 2021.09.14
  • Accepted : 2021.10.28
  • Published : 2021.11.05
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Abstract

Mechanical properties of fiber reinforced composites were affected to fiber volume fractions (FVF) and interfacial property by sizing agent conditions. An optimum interface can relieve stress concentration by transferring the mechanical stress from the matrix resin to the reinforcements effectively, and thus can result in the performance of the composites. The interfacial properties and wettability between the epoxy resin and glass fiber (GF) were evaluated for different sizing agent conditions and FVFs. The surface energies of epoxy resin and different sizing agent treated GFs were calculated using dynamic and static contact angle measurements. The work of adhesion, Wa was calculated by using surface energies of epoxy matrix and GFs. The wettability was evaluated via the GF tow capillary test. The interfacial shear strength (IFSS) was evaluated by microdroplet pull-out test. Finally, the optimized GFRP manufacturing conditions could be obtained by using wettability and interfacial property.

섬유강화복합재료의 기계적물성은 섬유의 체적분율 및 사이징제 조건에 의한 계면강도에 영향을 받는다. 최적의 계면은 기지층에서 강화재로의 기계적 응력을 효과적으로 전달하여 응력 집중을 완화하고 결과적으로 복합재료의 성능을 향상시킬 수 있다. 본 논문에서는 사이징제 조건 및 섬유체적분율에 따른 에폭시 수지와 유리섬유 간의 젖음성 및 계면강도를 평가하였다. 정적 및 동적접촉각을 이용하여 사이징제가 다른 유리섬유와 에폭시 수지의 표면에너지를 계산하였고, 이를 활용하여 접착일을 계산하였다. 유리섬유 토우 캐필러리 시험법을 이용하여 젖음성을 평가하였고, 마이크로드롭렛 인발시험을 통해 계산된 계면전단강도를 이용하여 계면강도를 평가하였다. 최종적으로 젖음성과 계면강도를 활용하여 최적의 유리섬유강화 복합재료 제작 조건을 확인하였다.

Keywords

Acknowledgement

본 연구는 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 이공학개인기초연구지원사업(No. 2016R1D1A1B0101262016)을 통해 진행한 연구 결과입니다.

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