Thermal, creep-recovery and viscoelastic behavior of high density polyethylene/hydroxyapatite nano particles for bone substitutes: effects of gamma radiation
作者： Othman Y Alothman , H Fouad , S M Al-Zahrani , Ayman Eshra , Mohammed Al Rez
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摘要: High Density Polyethylene (HDPE) is one of the most often used polymers in biomedical applications. The limitations HDPE are its visco-elastic behavior, low modulus and poor bioactivity. To improve properties, HA nanoparticles can be added to form polymer composite that as alternatives metals for bone substitutes orthopaedic implant In our previous work (BioMedical Engineering OnLine 2013), different ratios HDPE/HA nanocomposites were prepared using melt blending a co-rotating intermeshing twin screw extruder. accelerated aging effects on tensile properties torsional viscoelastic behavior (storage (G’) Loss (G”)) at 80°C irradiated non-irradiated was investigated. Also thermal studied. this study, gamma irradiation (E’) (E”)) 25°C examined frequencies Dynamic Mechanical Analysis (DMA). DMA also analyze creep-recovery relaxation nanocomposites. nanocomposite, Differential Scanning Calorimetry (DSC) used. microscopic examination cryogenically fractured surface revealed reasonable distribution matrix. showed storage loss increases with increasing ratio test frequency. improves nanoparticle content. Finally, results indicated crystallinity, viscoelastic, creep recovery nanocomposite improved due irradiation. Based experimental results, it found addition So, appears have fairly good comprehensive make candidate substitute.
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