 |
|
 |
|
|
| Volume 3, Issue 02 - 2007 |
|
|
| 4 |
Molecular dynamics in PMMA/Montmorillonite nanocomposites by dielectric relaxation spectroscopy |
| |
| Pages 63-70 |
| |
| P. ARRUTI, G. KORTABERRIA*, M.D. MARTIN, A. JIMENO, I. GARCIA, I. MONDRAGON |
| |
| “Materials + Technologies” Group, Escuela Universitaria Politécnica, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Plaza Europa 1, 20018 Donostia-San Sebastián, Spain |
| |
| Received 1 June 2007; accepted 2 July 2007 |
| |
| Relaxational behaviour of PMMA/montmorillonite nanocomposites prepared by solution method has been analysed by dielectric relaxation spectroscopy. This behaviour has been fitted to Havriliak-Negami, Arrhenius and Vogel-Fulcher models, analysing the clay effect on the fitting parameters. The relaxation spectrum of pure PMMA has been found to be affected by the presence of clay in the nanocomposite with highest content. While secondary â process has not been affected by the clay, the main á relaxation (and consequently the merging of á and â processes into áâ process) is affected at the highest clay content. In this case, the main process is slowed down by the clay presence, as indicates the higher Tg value, it shifts slower towards higher frequencies thus affecting the merging with â process, which does not take place in the temperature range analyzed. However, a meaningful isolation of the main relaxation has not been possible due to its overlapping with the interfacial Maxwell-Wagner polarization due to higher inorganic content. |
| |
back |
|
|
|
|
|
|