Fracture toughness of glass microsphere-filled polypropylene and polypropylene/poly (ethylene terephthalate-co-isophthalate) blend-matrix composites |
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Authors: | D Arencón J I Velasco V Realinho M Sánchez-Soto A Gordillo |
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Affiliation: | (1) Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Centre Català del Plàstic, Universitat Politècnica de Catalunya, Vapor Universitari de Terrassa. C. Colom 114, E-08222 Terrassa, Barcelona, Spain |
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Abstract: | The fracture behaviour of glass microsphere-filled polypropylene/poly(ethylene terephthalate-co-isophthalate) blend-matrix
composites was investigated in comparison with that of the glass microsphere-filled PP composites. Depending on the deformability
displayed by the composite, it was carried out through the linear-elastic fracture mechanics or by applying the J-integral concept. The matrix ductility was regulated in the composite through the glass bead surface treatment applied with
different silane-coupling agents, as well as with the addition of maleated PP as polymer compatibilizer. Whereas all the composites
failed in a brittle manner at moderate impact speed, quasi-brittle fracture behaviour was only observed at low strain rate
in composites having high and medium interfacial adhesion level. Results showed that composites containing both aminosilane-treated
glass microspheres and maleated PP showed the highest values of fracture toughness. In composites with low adhesion level
between matrix and glass beads, the critical J-integral value diminished due to the presence of PET. |
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