Fracture toughness of epoxy polymer modified with nanosilica particles: particle size effect
Publish place: 1st International and 6th Joint Conference of Iranian Society of Metallurgical Engineers and the scientific community of Casting
Publish Year: 1391
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
IMES06_450
تاریخ نمایه سازی: 8 بهمن 1391
Abstract:
An epoxy resin, cured with an anhydride, was modified by the addition of different nanosilica particles.The particles with 12, 20, and 40 nm in diameter, were distributed into epoxy resin with ultrasonic instrument which gave a very well-dispersed phase of nanosilica particles. Electron microscopy showedthat the nanosilica particles were well-dispersed throughout the epoxy resin. Tensile test and dynamic mechanical thermal analysis (DMTA) showed that Young’s modulus increased as the volume fraction of the nanosilica particles and the glass transition temperature was unchanged. The fracture energy increasedfrom 283J/m2 for the unmodified epoxy to about 620J/m2 for the epoxy with 3.17 vol% of 12-nm diameter nanosilica particles. The amount of fracture energy for smaller particles is greater that is related to high surface to volume ratio of these particles. The fracture surfaces were checked using scanning electron and atomic force microscopies, and the results were compared to various toughening mechanisms. Thetoughening mechanisms of crack pinning and crack deflection were discounted and two toughening mechanisms which were operative in the epoxy resin containing nanosilica particles were recognized to be plastic deformation and plastic void growth. Finally, the toughening mechanisms have been quantitatively modelled and an excellent agreement between the experimental and the evaluated fracture energies was found.
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Authors
Milad Zamanian
Polymer Engineering Group, Composite Science and Technology Research Center, Tehran, Iran
Babak Salehnia
Department of Polymer Engineering, Amirkabir University, Tehran, Iran
J. E. Jam
Polymer Engineering Group, Composite Science and Technology Research Center, Tehran, Iran
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