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http://hdl.handle.net/1942/24615
Title: | Optimisation and characterisation of nano-hydroxyapatite/polylactide composites using Fused Deposition Modelling technology | Authors: | Oris, Erwin | Advisors: | BUNTINX, Mieke VROMAN, Isabelle GINOUX, Geoffrey |
Issue Date: | 2017 | Publisher: | UHasselt | Abstract: | In this study, polylactide/nanohydroxyapatite (PLA/nHA) composites were produced for fused deposition modelling (FDM), which is an additive manufacturing technology commonly used for prototyping and production applications. First, PLA/nHA composites (0.5%, 1%, 3%, 5 wt.%) were compounded using a twin-screw extruder, subsequently, these were shaped into filaments with a single-screw extruder. Thirdly, specimens for dynamic mechanical analysis (DMA) and tensile testing were FDM printed. Doehlert response surface methodology was applied to optimise the tensile properties of each formulation. A comparison of the mechanical properties of the printed tensile test specimens with injection moulded specimens showed a lower Young's modulus and ultimate strength and a higher storage modulus for the printed samples. Additionally, the same ultimate strength decreased with higher HA content. HA induced nucleation of PLA, but also a reduction of the degradation temperature, as shown by differential scanning calorimetry and thermogravimetric analysis respectively. Oscillatory rheological analysis showed the presence of a Newtonian plateau, followed by a shear thinning behaviour. The first HA addition resulted in a thickening effect, decreasing upon addition of HA, up to a thinning effect at 5 wt.%. In conclusion, this study proves successful printing of PLA/nHA nanocomposites using FDM, which might be promising e.g. for bone tissue engineering. | Notes: | master in de industriƫle wetenschappen: verpakkingstechnologie | Document URI: | http://hdl.handle.net/1942/24615 | Category: | T2 | Type: | Theses and Dissertations |
Appears in Collections: | Master theses |
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00000000-9129-4ffc-acb1-2e7ea3dd9ff4.pdf | 7.14 MB | Adobe PDF | View/Open | |
00000000-331c-4c54-a078-dfd5ad7542d2.pdf | 981.76 kB | Adobe PDF | View/Open |
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