Journal
POLYMER
Volume 150, Issue -, Pages 44-51Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2018.07.084
Keywords
Graphite fluoride; Epoxy; Toughening mechanism
Categories
Funding
- Southern University of Science and Technology (SUSTech)
- Foundation of Shenzhen Science and Technology Innovation Committee [ZDSYS20140509142721431, JCYJ20160315164631204, KQJSCX20170726145415637, JCYJ20170817110440310]
- Recruitment Program of Global Youth Experts of China
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Epoxy composites with excellent toughness and strength have been successfully fabricated by direct incorporation of graphite fluoride (GrF) without using any solvent or surfactant modification. Owing to the strong interfacial interactions, the glass transition temperature of GrF/epoxy composites exhibits a significant improvement as observed by dynamic mechanical analysis. Mechanical characterizations on GrF/epoxy composites suggest that the optimal increase of tensile strength and Youngs modulus is achieved at a low filler concentration of 0.5 wt%, which is attributed to the favorable level of the GrF dispersion in the epoxy matrix. A maximum toughening effect is obtained a the concentration of 1 wt% GrF in the epoxy matrix with a 1.5-fold improvement in fracture toughness. The generation of crack pinning and crack deflection in epoxy due to the existence of GrF platelets is proposed to be the main toughening mechanism. Besides, microcracks resulted from pulling out, layer breakage and interfacial debonding of GrF platelets also contribute to the improvement in the fracture toughness of GrF/epoxy composites.
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