Confinement of C60 nanoparticles on the dynamics of polystyrene studied by anelastic spectroscopy and rheometrics

Zhengping Fang; Shuying Shang; Hao Wang

doi:10.1117/12.2028373

9 August 2013 Confinement of C₆₀ nanoparticles on the dynamics of polystyrene studied by anelastic spectroscopy and rheometrics

Zhengping Fang, Shuying Shang, Hao Wang

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Proceedings Volume 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering; 87930Y (2013) https://doi.org/10.1117/12.2028373
Event: Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 2013, Gold Coast, Australia

Abstract

Anelastic spectroscopy and rheometrics were used to study the viscoelastic properties of polystyrene/C₆₀ nanocomposites. 0.1 wt%, 0.5 wt%, 1 wt% and 2 wt% C₆₀ were added to pure polystyrene via melt compounding. Both storage modulus and viscosity decreased obviously when 0.1 wt% C₆₀ was added and it was ascribed to the increase of free volume around C₆₀ nanoparticles. Both glass transition and liquid-liquid transition moved to high temperature, which was associated with the confinement effect of the nanoparticles. The addition of C₆₀ influenced chain packing of polymer melts. The increase of free volume loosened the interaction between chain segments and nanoparticles on small size scale. So, the change of segment dynamics was not very obvious. On the contrary, the change of whole chain dynamics was very obvious. This can be explained by the fact that the influence coming from the increase of free volume was neglectable and the filler confinement of nanoparticles played an important role. The C₆₀ nanoparticles were looked as attractors of the polymer chains, which divided the long chains into several segments leading to decrease the fragility of the nanocomposites.

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Zhengping Fang, Shuying Shang, and Hao Wang "Confinement of C₆₀ nanoparticles on the dynamics of polystyrene studied by anelastic spectroscopy and rheometrics", Proc. SPIE 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 87930Y (9 August 2013); https://doi.org/10.1117/12.2028373

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KEYWORDS

Polymers

Nanoparticles

Nanocomposites

Glasses

Particles

Spectroscopy

Temperature metrology

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