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Main articleCC BY-NC-ND V4.0, Open Access
Accepted manuscript
Dynamics of poly(methyl methacrylate)–montmorillonite nanocomposites: A dielectric study
Journal of non-crystalline solids., Vol.410, pp.43-50
2015
Handle:
https://hdl.handle.net/2376/5585
Abstract
The effect of varying amounts of montmorillonite (MMT) filler (in weight ratios of 100/0, 100/5, and 100/10) on the molecular dynamics and polarization of atactic poly(methyl methacrylate) (PMMA) is investigated using broad-band dielectric spectroscopy from 10−2 to 106 Hz and at temperatures from 30 to 140 °C. The experimental data were analyzed with the sum of Havriliak–Negami (HN) functions and a power-law conduction term. The characteristic frequency, activation energies, and dielectric strength of PMMA/MMT nanocomposites were analyzed. As MMT content increases, a Maxwell–Wagner–Sillars (MWS) relaxation emerges in the nanocomposites and the α-relaxation contributed by main-chain movements above Tg occurs at lower temperatures as silicate layers in MMT segregate PMMA chains into smaller domains. The characteristic frequency of β-relaxations is influenced by the mergence with the α-relaxation above Tg. Further, the strength of the β-relaxation is stable as a function of temperature in both pure PMMA and the PMMA/MMT nanocomposites whereas, in the nanocomposites, the strengths of the α- and MWS relaxations increase significantly with temperature up to approximately 120 °C.
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Details
- Title
- Dynamics of poly(methyl methacrylate)–montmorillonite nanocomposites: A dielectric study
- Creators
- Weixing Sun (Author)Li Li (Author)Eduard A. Stefanescu (Author)Michael Kessler (Author)Nicola Bowler (Author)
- Publication Details
- Journal of non-crystalline solids., Vol.410, pp.43-50
- Academic Unit
- Mechanical and Materials Engineering, School of
- Identifiers
- 99900503048401842
- Copyright
- Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International ; http://creativecommons.org/licenses/by-nc-nd/4.0/
- Language
- English
- Resource Type
- Accepted manuscript