This paper focuses on the effects of pressure and temperature in hot press molding on the mechanical properties of polypropylene-hydroxyapatite composites with two different types of silanated and unsilanated hydroxyapatite. Density, crystallinity, ultimate tensile strength, Young’s modulus and impact resistance were evaluated for the two types of composites. Increasing pressure caused enhancement of density, crystallinity, MFI, ultimate tensile strength and Young’s modulus. Increases in temperature increased MFI, ultimate tensile strength and Young’s modulus whilst decreased impact resistance of composites. Effects of increasing pressure and temperature on the mechanical properties of polypropylene-silanated hydroxyapatite were less than their effects on the mechanical properties of polypropylene-unsilanated hydroxyapatite. Micrographs showed changes in fracture mode from ductile to brittle with increasing pressure and temperature during hot press molding.
Influence of Hot Pressing Parameters on Mechanical Properties of PP-HA Bio-Composites
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Younesi, M, Bahrololoom, ME, & Fooladfar, H. "Influence of Hot Pressing Parameters on Mechanical Properties of PP-HA Bio-Composites." Proceedings of the ASME 2009 International Mechanical Engineering Congress and Exposition. Volume 14: Processing and Engineering Applications of Novel Materials. Lake Buena Vista, Florida, USA. November 13–19, 2009. pp. 93-100. ASME. https://doi.org/10.1115/IMECE2009-13148
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