Dongyu Cai et al 2009 Nanotechnology 20 085712 doi:10.1088/0957-4484/20/8/085712
Dongyu Cai, Kamal Yusoh and Mo Song1
Show affiliationsSignificant reinforcement of polyurethane (PU) using graphite oxide nanoplatelets (GONPs) is reported. Morphologic study shows that, due to the formation of chemical bonding, there is a strong interaction between the GONPs and the hard segment of the PU, which allows effective load transfer. The GONPs can prevent the formation of crystalline hard segments due to their two-dimensional structure. With the incorporation of 4.4 wt% of GONPs, the Young's modulus and hardness of the PU are significantly increased by ~900% and ~327%, respectively. The resultant high resistance to scratching indicates promise for application of these composite materials in surface coating.
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure
68.35.Ct Interface structure and roughness
62.20.Qp Friction, tribology, and hardness
62.25.-g Mechanical properties of nanoscale systems
81.40.Jj Elasticity and anelasticity, stress-strain relations
Surfaces, interfaces and thin films
Issue 8 (25 February 2009)
Received 2 December 2008, in final form 13 January 2009
Published 3 February 2009
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