|About this Abstract
||Materials Science & Technology 2011
||Next Generation Biomaterials
||Processing Effects on the Crystallinity, Microstructure, and Mechanical Properties of Hydroxyapatite Reinforced Polyetheretherketone Scaffolds
||Timothy Lee Conrad, David D. Jaekel, Steven M. Kurtz, Ryan K. Roeder
|On-Site Speaker (Planned)
||Timothy Lee Conrad
Hydroxyapatite (HA) whisker reinforced polyetheretherketone (PEEK) scaffolds were designed to exhibit mechanical properties similar to human vertebral trabecular bone and promote bone ingrowth by bioactive HA crystals. The objective of this study was to investigate processing effects on the crystallinity, microstructure, and mechanical properties of HA whisker reinforced PEEK scaffolds. The effects of the mold temperature, cooling rate, porogen morphology, and flow during compression molding were investigated in scaffolds comprising of 20 vol% HA whiskers and 75% porosity. Increased mold temperature resulted in improved sintering, but decreased crystallinity. The compressive yield strength, yield strain, and modulus increased with increased temperature to a maxima at 380-385°C. Decreased cooling rate did not significantly affect mechanical properties. Scaffolds prepared with a spherical porogen resulted in increased interconnectivity with no change in mechanical properties. Static compression molding resulted in segregation of HA between PEEK particles, but shear flow led to improved dispersion of HA.