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.
|Number of pages||1|
|Publication status||Published - 25 Mar 2007|
|Event||233rd ACS National Meeting - Chicago, United States|
Duration: 25 Mar 2007 → 29 Mar 2007
|Conference||233rd ACS National Meeting|
|Period||25/03/07 → 29/03/07|
- aging behavior
- polysiloxane elastomers
- aspect ratios
- broadband dielectric spectroscopy
Lewicki, J. P., Hayward, D., Liggat, J. J., & Pethrick, R. A. (2007). Investigating the aging behavior of polysiloxane nanocomposites with degradative thermal analysis and broadband dielectric spectroscopy. -. Abstract from 233rd ACS National Meeting, Chicago, United States.