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۱Fabrication of Epoxy\Multi–Walled Carbon Nanotube–Nanoclay Nanocomposites: Investigation of Fracture Toughness
نویسنده(ها): ، ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی کامپوزیت، سال
تعداد صفحات: ۶
The effect of concurrent presence of multi–walled carbon nanotube (MWNT) and nanoclay on fracture toughness of epoxy was studied. First, the effects of various contents of MWNT and nanoclay (as reinforcement factors) on fracture toughness of epoxy were investigated separately. Then, the optimum content of each reinforcement factor was used concurrently in epoxy and the changes in the amount of fracture toughness of the resulting nanocomposite compared with those of previous nanocomposites were studied. The SEM studies were used for the fractography of specimens and also for investigating the dispersion of MWNTs in the matrix which indicated that the MWNTs were dispersed well. The Xray diffraction (XRD) was applied to determine the d–spacing of nanoclay layers. The results show that d–spacing of layers increases from 18.42 A° to 42.28 A° and an intercalated nanocomposite is obtained<\div>

۲The effect of multi–walled carbon nanotube dimensions on mechanical properties of epoxy–based nanocomposites
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی کامپوزیت، سال
تعداد صفحات: ۶
The effects of multi–walled carbon nanotube (MWNT) diameter on the mechanical properties of epoxy\MWNT nanocomposites are studied and a correction factor for the Halpin–Tsai model is proposed based on the experimental results. This correction factor accounts for phenomena, such as filler bending or imperfect bonding, which are not included in the theory. To determine the suitable amount of filler, a number of test specimens based on different contents of MWNTs were prepared and tested and 0.5 wt% of MWNT was chosen as the best filler content based on the mechanical properties and the dispersion status. To compare Young’s modulus with the theoretical estimations, the Tsai–Halpin model was used which overestimated the experimental results. Therefore, a correction factor was introduced to the equation to fit the obtained experimental results. The proposed modified equation could predict the experimental result much more effectively. In addition, the modified Tsai– Halpin theory was successfully used to predict the tensile strength in the same fashion as the Young’s modulus<\div>
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