Filled PMMA: Mechanical properties and fracture behaviour

The aim of this work is to study the influence of the filler fraction and t hat of the filler/matrix interfacial adhesion on the mechanical properties and on the fracture behaviour of a poly(methyl methacrylate) PMMA (for inje ction moulding). The variation of the tensile and flexural mechanical prope rties with the filler volume fraction was determined. The changes in the fr acture behaviour produced by the fillers were studied by evaluating the Kic and Gic parameters of the LEFM (Linear Elastic Fracture Mechanics) by carr ying out tests with SENB geometry at room temperature and low strain rates. After fracture surfaces examination by SEM (Scanning Electron Microscopy), it was found that the surface treatment had been rather effective and that the fracture toughening mechanism was multiple crazing.