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- W1969006871 abstract "This study investigates the effects of nanostructure size and surface area on the rheological properties of un-cross-linked poly(propylene fumarate) (PPF) nanocomposites and the mechanical properties of cross-linked nanocomposites as a function of the nanostructure loading. Three model carbon nanostructures were examined, C(60) fullerenes, ultra-short single-walled carbon nanotubes (US-tubes) and single-walled carbon nanotubes (SWNTs). Rheological measurements showed that C60 and US-tube un-cross-linked nanocomposites exhibited viscous-like characteristics with the complex viscosity independent of frequency for nanostructure concentrations up to 1 wt%. Compressive and flexural mechanical testing demonstrated significant mechanical reinforcement of US-tube and SWNT nanocomposites as compared to cross-linked polymer alone, with an up to twofold increase in the mechanical properties. Scanning electron microscopy examination of the fracture surface of cross-linked US-tube nanocomposite revealed lack of aggregation of US-tubes. Although sol fraction studies did not provide any evidence of additional cross-linking, due to the presence of US-tubes in the nanocomposites, transmission electron microscopy studies suggested the crystallization of PPF on the surface of US-tubes which can contribute to the mechanical reinforcement of the US-tube nanocomposites. These results demonstrate that the rheological properties of un-cross-linked nanocomposites depend mainly on the carbon nanostructure size, whereas the mechanical properties of the cross-linked nanocomposites are dependent on the carbon nanostructure surface area. The data also suggest that US-tube nanocomposites are suitable for further consideration as injectable scaffolds for bone tissue engineering applications." @default.
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- W1969006871 date "2007-01-01" @default.
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- W1969006871 title "Injectable in situ cross-linkable nanocomposites of biodegradable polymers and carbon nanostructures for bone tissue engineering" @default.
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- W1969006871 doi "https://doi.org/10.1163/156856207781034133" @default.
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