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

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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.

ORCID iDs

Lewicki, James P., Hayward, David, Liggat, John J. ORCID logoORCID: https://orcid.org/0000-0003-4460-5178 and Pethrick, Richard A.;
CORE (COnnecting REpositories)