Improvement of interlaminar properties of carbon fiber-reinforced epoxy composites using aluminum trihydroxide

  • Dong-Jun Kwon
  • Sung-Min Park
  • Il-Jun Kwon
  • Joung-Man Park
  • Euigyung JeongEmail author
Original Article


This study provides an economical and effective method to improve the interlaminar properties of carbon fiber-reinforced polymers (CFRPs) using aluminum trihydroxide (ATH) microparticles. ATH microparticles are cheap and are expected to show good affinity to epoxies in the matrix and sizing agents of the carbon fibers owing to the presence of three hydroxyl groups. In addition, ATH particles are reported to improve the mechanical properties of polymers when used as the reinforcement. In this study, ATH microparticles of various sizes, 1.5, 10, and 20 µm, were used to improve the interlaminar properties of the CFRPs. ATH particles with a size of 1.5 μm improved the tensile properties of the ATH/epoxy resin and did not significantly alter the curing behavior. The interfacial adhesion between the carbon fiber and the epoxy resin was also improved, and the impregnation of the resin mixture remained similar to that of the neat resin, resulting in no significant void and defect formation. Considering the above results, the resulting 1.5 μm ATH-reinforced CFRP showed improved interlaminar properties compared to CFRP without ATH. However, 10 and 20 μm ATH-reinforced CFRPs showed deteriorated interlaminar properties due to the diminished tensile properties of the resin itself and resin impregnation, which resulted in more voids and defects, despite the interfacial adhesion between the fiber and the matrix resin.


Polymer matrix composites Fiber/matrix bond Interface/interphase Fracture toughness 



This work was supported by Korea Evaluation Institute of Industrial Technology and Ministry of Trade, Industry and Energy, under Contract No. 10063368, 2016-2021.


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Copyright information

© Korean Carbon Society 2019

Authors and Affiliations

  • Dong-Jun Kwon
    • 1
  • Sung-Min Park
    • 1
  • Il-Jun Kwon
    • 1
  • Joung-Man Park
    • 2
  • Euigyung Jeong
    • 3
    Email author
  1. 1.Polymer Resin TeamKorea Dyeing and Finishing InstituteDaeguKorea
  2. 2.Department of Materials Engineering and Convergence TechnologyGyeongsang National UniversityJinjuKorea
  3. 3.Department of Textile System EngineeringKyungpook National UniversityDaeguKorea

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