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Nanomechanical characterization of single-walled carbon nanotube reinforced epoxy composites

Xiaodong Li1,3, Hongsheng Gao1, Wally A Scrivens2, Dongling Fei2, Xiaoyou Xu2, Michael A Sutton1, Anthony P Reynolds1 and Michael L Myrick2

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Nanomechanical properties of single-walled carbon nanotube (SWNT) reinforced epoxy composites with varying weight percentage (0, 1, 3, and 5 wt%) of nanotubes were measured by nanoindentation and nanoscratch techniques. Hardness and elastic modulus were measured using a nanoindenter. Scratch resistance and scratch damage were studied using the AFM tip sliding against the SWNT reinforced sample surfaces. Nanoindentation/nanoscratch deformation and fracture behaviour was studied by in situ imaging of the indentation impressions/scratch tracks. Viscoelastic properties of the nanocomposites were measured using nanoindentation dynamic mechanical analysis tests. The reinforcing mechanisms are discussed with reference to the nanotube dispersion, interfacial bonding, and load transfer in the SWNT reinforced polymer composites.


PACS

62.25.-g Mechanical properties of nanoscale systems

81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

81.40.Jj Elasticity and anelasticity, stress-strain relations

62.20.M- Structural failure of materials

62.20.Qp Friction, tribology, and hardness

81.07.De Nanotubes

Subjects

Condensed matter: structural, mechanical & thermal

Nanoscale science and low-D systems

Dates

Issue 11 (November 2004)

Received 21 April 2004

Published 23 August 2004



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