CHARACTERIZATION OF POLY(METHYL METHACRYLATE BASED NANOCOMPOSITES ENHANCED WITH CARBON NANOTUBES
作者： Andrew Jonathan Placido
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摘要: OF THESIS CHARACTERIZATION POLY(METHYL METHACRYLATE)-BASED NANOCOMPOSITES ENHANCED WITH CARBON NANOTUBES The viscoelastic relaxation dynamics of a series poly(methyl methacrylate) [PMMA] based nanocomposites filled with carbon nanotubes have been studied using dynamic mechanical analysis and broadband dielectric spectroscopy. networks were prepared four methods: (i) melt mixing, (ii) solution processing, (iii) in-situ polymerization, (iv) polymer grafting. Nanotube modifications included surface oxidation via acid exposure functionalization for effect variations in processing method nanotube modification on glass transition temperature (Tg) was investigated. behavior the sensitive to functionalization. loading (to 5 wt%) led progressive increase rubbery modulus, more pronounced solution-processed samples owing enhanced dispersion. In case oxidized nanotubes, an but also systematic decrease Tg ~ 15°C 3 wt% nanotubes. For polymerized (PMMA/MWNT-ox) nanocomposites, there no readily discernable trend Tg. Composites polymerization presence methyl methacrylate functionalized tubes (i.e., grafting) displayed positive shift nearly 20°C at 1 loading. Investigation PMMA/MWNT composites indicated percolation threshold between 0.3 0.4 MWNT.
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