Journal
COMPOSITES PART B-ENGINEERING
Volume 114, Issue -, Pages 111-120Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2017.01.051
Keywords
Polymer-matrix composites (PMCs); Particle-reinforcement; Fracture toughness; Thermal properties
Funding
- Leading Human Resource Training Program of Regional Neo industry through National Research Foundation of Korea(NRF) - Ministry of Science, ICT and future Planning [NRF-2016H1D5A1909732]
- Industrial Strategic technology development program - Ministry of Trade, industry & Energy (MI, Korea) [10050953]
- National Research Foundation of Korea [22A20130012138, 2016H1D5A1909732] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Novel hybrid fillers composed of nanodiamond (ND) nanocluster-decorated graphene oxide (GO) were fabricated and incorporated in an epoxy matrix using a facile thermoregulatory liquid-liquid extraction method. X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses confirmed a chemical bonding between the (3-aminopropyl)triethoxysilanefunctionalized ND and (3-glycidyloxypropyl)trimethoxysilane-functionalized GO. The morphology of the hybrid filler (GN) was characterized by field-emission transmission electron microscopy. ND nano clusters with an average diameter of 50-100 nm were uniformly grown on the GO surface. The hybrid filler provided significant enhancement of mechanical properties, such as flexural strength, flexural modulus, and fracture toughness. In particular, the epoxy composite containing 0.1 wt% of GN hybrid exhibited a stronger mechanical behavior compared to that containing 0.2 wt% of GO. As the GN loading increased, the thermal stability, the integral procedural decomposition temperature, and the activation energy increased as well. The toughening mechanism was illustrated by a microcrack theory based on the microscopic analysis of the fracture surfaces. The presence of ND nanoclusters not only hindered the aggregation of the GO sheets, but also played a crack pinning role in the polymer-matrix composites, which could significantly enhance its fracture toughness. (C) 2017 Elsevier Ltd. All rights reserved.
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