Characterization of epoxy functionalized graphite nanoparticles and the physical properties of epoxy matrix nanocomposites |
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| Authors: | Sandi G Miller Jonathan L Bauer Michael J Maryanski Paula J Heimann Jeremy P Barlow Jan-Michael Gosau Ronald E Allred |
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| Affiliation: | 1. Polymers Branch, NASA Glenn Research Center, Cleveland, OH 44135, United States;2. Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, United States;3. Department of Chemical Engineering, University of Akron, Akron, OH 44325, United States;4. Ohio Aerospace Institute, Cleveland, OH 44135, United States;5. Adherent Technologies, Inc., Albuquerque, NM 87111, United States |
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| Abstract: | This work presents a novel approach to the functionalization of graphite nanoparticles. The technique provides a mechanism for covalent bonding between the filler and matrix, with minimal disruption to the sp2 hybridization of the pristine graphene sheet. Functionalization proceeded by covalently bonding an epoxy monomer to the surface of expanded graphite, via a coupling agent, such that the epoxy concentration was measured as approximately 4 wt.%. The impact of dispersing this material into an epoxy resin was evaluated with respect to the mechanical properties and electrical conductivity of the graphite–epoxy nanocomposite. At a loading as low as 0.5 wt.%, the electrical conductivity was increased by five orders of magnitude relative to the base resin. The material yield strength was increased by 30% and Young’s modulus by 50%. These results were realized without compromise to the resin toughness. |
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| Keywords: | A Nanocomposites A Polymer B Electrical properties B Mechanical properties |
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