The effect of silica nanoparticles on the morphology, mechanical properties and thermal degradation kinetics of PMMA |
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Authors: | M.L. Saladino T.E. MotaungA.S. Luyt A. SpinellaG. Nasillo E. Caponetti |
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Affiliation: | a Department of Chemistry “S.Cannizzaro”, University of Palermo, Parco d'Orleans II-Viale delle Scienze pad.17, Palermo I-90128, Italy b Department of Chemistry, University of the Free State (Qwaqwa Campus), Private Bag X13, Phuthaditjhaba 9866, South Africa c Centro Grandi Apparecchiature-UniNetLab, University of Palermo, Via F. Marini 14, Palermo I-90128, Italy |
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Abstract: | Silica-PMMA nanocomposites with different silica quantities were prepared by a melt compounding method. The effect of silica amount, in the range 1-5 wt.%, on the morphology, mechanical properties and thermal degradation kinetics of PMMA was investigated by means of transmission electron microscopy (TEM), X-ray diffractometry (XRD), dynamic mechanical analysis (DMA), thermogravimetric analyses (TGA), Fourier-transform infrared spectroscopy (FTIR), 13C cross-polarization magic-angle spinning nuclear magnetic resonance spectroscopy (13C{1H} CP-MAS NMR) and measures of proton spin-lattice relaxation time in the rotating frame (T1ρ(H)), in the laboratory frame (T1(H)) and cross-polarization times (TCH). Results showed that silica nanoparticles are well dispersed in the polymeric matrix whose structure remains amorphous. The degradation of the polymer occurs at higher temperature in the presence of silica because of the interaction between the two components. |
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Keywords: | PMMA Silica 13C{1H} CP-MAS NMR Degradation kinetics |
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