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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Investigating the aging behavior of polysiloxane nanocomposites with degradative thermal analysis and broadband dielectric spectroscopy

Lewicki, James P. and Hayward, David and Liggat, John J. and Pethrick, Richard A. (2007) Investigating the aging behavior of polysiloxane nanocomposites with degradative thermal analysis and broadband dielectric spectroscopy. In: 233rd ACS National Meeting, 2007-03-25 - 2007-03-29.

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Abstract

The physical and chemical aging of polysiloxane elastomers incorporating nano-scale particles of differing dimensions and aspect ratios is reported. A series of model polysiloxane nanocomposites have been prepared incorporating montmorillonite nanoclay and polyhedralsilsesquioxane (POSS). Broadband Dielectric Spectroscopy (BDS) has been employed to study the effects of aging on polymer-filler interactions within the nanocomposites by tracking changes in system ionic mobility and filler-induced Maxwell-Wagner-Sillars effects. TGA and DSC have been utilized to study the effects of aging on the non-oxidative stability of the nanocomposites. The complex evolution of volatiles that occurs during aging has been studied using Sub-Ambient Thermal Volatilization Analysis (SATVA). Results indicate that significant physical and chemical changes take place within the nanocomposites upon aging; acid catalyzed hydrolysis, chain backbiting and recombination reactions are re-structuring the polymer-filler network into a more thermodynamically stable form. The nature and magnitude of these processes is dependant on the nano-filler present.