Surface Segmental Mobility and Adhesion - Effects of Filler and Molecular Mass
The adhesion of thin films of poly(methyl acrylate) (PMA) on glass slides in contact with tape has been measured as a function of thickness, molecular mass, and amount of silica-based filler. In all cases studied the polymer thin-film, tape-peel tests resulted in linear force-velocity plots. The best-fit lines were extrapolated to find the fracture energies at zero velocity. For thin layers of rubbery PMA on glass slides the PMA-tape fracture energies were found to decrease (from 55-20J/m) with increasing PMA thickness (50-1000nm). Thin films made from glassy poly (methyl methacrylate) (PMMA) were found to have no thickness dependence and much higher fracture energies (∼140J/m). The effect of PMA molecular mass was found to be smaller than the effect of film thickness. Including silica in the films at low levels dramatically increased the fracture energies, with a maximum (182J/m) found with 5.2% silica. with larger amounts of silica, the fracture energy declined significantly.
F. D. Blum et al., "Surface Segmental Mobility and Adhesion - Effects of Filler and Molecular Mass," Journal of Adhesion, Taylor & Francis, Jan 2006.
Chemical and Biochemical Engineering
Article - Journal
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