Influence of the material properties of a poly(D,L-lactide)/β-tricalcium phosphate composite on the processability by selective laser sintering
| Autor: | Horst Fischer, Reinhart Poprawe, Marijan Vucak, Martin Bullemer, Wilhelm Meiners, Christoph Gayer, Lucas Jauer, Frank Reinauer, Jessica Abert, Konrad Wissenbach, Stefanie Grom, Johannes Henrich Schleifenbaum |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2018 |
| Předmět: |
Calcium Phosphates
0209 industrial biotechnology Materials science Surface Properties Polyesters Composite number Biomedical Engineering 02 engineering and technology law.invention Biomaterials chemistry.chemical_compound 020901 industrial engineering & automation Polylactic acid Flexural strength law Selective laser melting Composite material Bone regeneration Mechanical Phenomena chemistry.chemical_classification Lasers Temperature Polymer 021001 nanoscience & nanotechnology Molecular Weight Selective laser sintering chemistry Mechanics of Materials Particle size 0210 nano-technology |
| Zdroj: | Journal of the mechanical behavior of biomedical materials. 87 |
| ISSN: | 1878-0180 |
| Popis: | Complex 3D scaffolds with interconnected pores are a promising tool for bone regeneration. Such 3D scaffolds can be manufactured by selective laser sintering (SLS) from biodegradable composite powders. However, the mechanical strength of these scaffolds is often too low for medical application. We propose that the mechanical strength of laser-sintered scaffolds can be improved through composite powders with tailored properties (e.g., suitable powder particle size and melt viscosity for SLS). To prove this, two batches of a poly(D,L-lactide) (PDLLA)/v-tricalcium phosphate (v-TCP) composite powder with 50 wt% PDLLA and 50 wt% v-TCP were synthesized. The two batches differed in polymer particle size, filler particle size, and polymer molecular weight. Both batches were processed with identical SLS process parameters to study the extent to which the material properties influence how well a PDLLA/v-TCP (50/50) composite can be processed with SLS. In the SLS process, batch 2 showed improved melting behavior due to its smaller polymer particle size (approx. 35 µm vs. 50 µm) and its lower zero-shear melt viscosity (5800 Pa∙s vs. 17,900 Pa∙s). The better melting behavior of batch 2 led to SLS test specimens with lower porosity compared to batch 1. In consequence, the batch 2 specimens exhibited a larger biaxial bending strength (62 MPa) than the batch 1 specimens did (23 MPa). We conclude that a tailored composite powder with optimized polymer particle size, filler particle size, and polymer molecular weight can increase the achievable mechanical strength of laser-sintered scaffolds. |
| Databáze: | OpenAIRE |
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