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Fabrication and Characterization of Hybrid NanoComposites Based on Epoxy/NanoDiamond/CarbonFiber

Sepehri Sadeghian, Mohammad Sajjad | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48795 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s):
  7. Abstract:
  8. Polymer composites, due to its exclusive properties, has a special place in industry. Epoxy resin with high adhesion property, low density, thermal stability and high chemical resistance has a special place as matrix in fabrication of high technology hybrid composites. Hybrid composites, due to its high strength and long fatigue life, used to reinforcing building structures and manufacturing fuselage. Layer and reactive structure near the firm core and wear-resistant of NDs, used to improvement of epoxy reisn and hybrid NanoComposite interphase properties. In this study, for improvement of the properties of hybrid NanoComposites, used the NDs in 0.25, 0.5 and 1 %wt with amine and carboxyl surface modified. Initially, rheological behavior and rheokinetic properties of Epoxy/NDs and then mechanical properties of Hybrid NanoComposites had been studied. For preparation the mixture of Epoxy/NDs, curing systems, prepregs and hybrid NanoComposites used respectively bath ultrasonic and mechanical mixing, in-situ polymerization, hand lay up and hot pressure molding. Intrinsic viscosity and storage shear modulus, due to improvement of interaction between surface modified NDs and epoxy, increased with increasing weight percent of NDs and go from carboxylated to aminated NDs. Activation energy of gelation for epoxy including carboxylated and aminated NDs with amount of 14.4% and 12.3% is lesser and bigger than blank epoxy, respectively, due to facilitating and intervention effect on formation of 3D network and curing mechanism. Tensile modulus and ILSS in samples with 0.25%wt NDs, in each surface modification, increased 19% and 18.7%, respectively, but with increasing the amount of NDs, because of agglomeration of NDs and weakening the interphase, lowered, specially in flexural strength but flexural modulus increased in 0.25% and 0.5% wt of each surface modified NDs with amount of 8.8% and 4.5%, respectively. DMA results showed that crosslinking density and glass-transition temperature for sample with 0.25%wt aminated and carboxylated NDs increased 77.36% and 5℃ versus 38.42% and 2℃, respectively. SEM images properly showed fiber-pullout and fiber-matrix debonding, specially when amounts of NDs increased
  9. Keywords:
  10. Epoxy Resin ; Carbon Fibers ; Nanodiamond ; Mechanical Properties ; Rheological Behavior ; Rheokinetic ; Epoxy Compounds ; Diamond Nanoparticle ; Hybrid Nanocomposite

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