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Effects of curing techniques and silane treatment on mechanical and morphological properties of fly ash/epoxy composites

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Author(s): Chaowasakoo, T. | Sombatsompop, N.

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 29;
Issue: 1;
Start page: 217;
Date: 2007;
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Keywords: coupling agent | epoxy resin | microwave | fly ash | polymer-matrix composites.

ABSTRACT
In this research, the effect of curing techniques and silane treatment on mechanical and morphological properties of fly ash (20 and 80 phr) filled epoxy composites were studied. The addition of N-2(amino-ethyl)-3 aminopropyltrimethoxysilane (KBM603) coupling agent was varied 0.0, 0.5, 1.0 and 1.5 %wt of the fly ash, for surface treatment of fly ash particles. The optimum curing conditions of conventional thermal and microwavecuring system were determined using a differential scanning calorimetry (DSC). The conventional hermal curing was performed at 70OC for 80 min while microwave curing was carried out at 240 wattfor 18 minutes in order to achieve the optimum curing conditions of the composites. The silane concentration of 0.5 wt% was recommended for the optimum mechanical properties of the fly ash, epoxy composites.Beyond these recommended contents, the mechanical properties greatly reduced, except for the flexural moduli. By comparing microwave cured composites with conventional thermal cured composites, it was foundthat microwave cured composites consumed shorter cure time and had higher ultimate strengths and elongation at break than those by the conventional thermal cure. The composites with higher tensile and flexuralmoduli could be obtained by the conventional thermal cure. The comparative results of composites cured using different microwave powers showed that the ultimate strengths and elongation at break decreased withincreasing microwave power while the effect was opposite for the tensile and flexural moduli.
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