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, Chicago.
Full text not available in this repository. (Request a copy from the Strathclyde author)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.
| Item type: | Conference or Workshop Item (Other) |
|---|---|
| ID code: | 35712 |
| Keywords: | aging behavior, polysiloxane elastomers, aspect ratios, broadband dielectric spectroscopy , Chemistry |
| Subjects: | Science > Chemistry |
| Department: | Faculty of Science > Pure and Applied Chemistry |
| Related URLs: | |
| Depositing user: | Pure Administrator |
| Date Deposited: | 08 Nov 2011 14:33 |
| Last modified: | 04 Oct 2012 17:51 |
| URI: | http://strathprints.strath.ac.uk/id/eprint/35712 |
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