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- Title
Effect of ceramic filler content on the mechanical and thermal behaviour of poly- l-lactic acid and poly- l-lactic-co-glycolic acid composites for medical applications.
- Authors
Damadzadeh, Behzad; Jabari, Hamideh; Skrifvars, Mikael; Airola, Karri; Moritz, Niko; Vallittu, Pekka K.
- Abstract
One main application of resorbable poly- l-lactic acid (PLLA) and poly- l-lactic-co-glycolic acid (PLGA) based materials is in medical implants. In this study composites were made from PLLA and PLGA with hydroxyapatite (HAp) respective β-tricalcium phosphate (β-TCP) fillers. The filler content and particle size were varied, and the thermal properties as well as the mechanical strength of the composites were investigated. The composites were made by an extrusion compounding process giving 2–2.5 mm diameter sized profiles. The results verified that the thermal stability of the composites was reasonable during the optimized compounding conditions. Scanning electron microscopy revealed that the fillers were well dispersed in the polymer matrices. The mechanical properties were improved by the addition of the fillers. The optimum mechanical properties for the extruded profiles were obtained with the HAp fillers. The E-modulus was increased from 3.3 to 4.6 GPa by addition of filler particles (30 wt%) whereas the flexural strength was reduced from 133 to 106 MPa.
- Subjects
FILLER materials; MATERIALS; THERMAL properties of polymers; EXTRUSION process; BIOPOLYMERS; FIBER-reinforced ceramics; STRENGTH of materials; SCANNING electron microscopy
- Publication
Journal of Materials Science: Materials in Medicine, 2010, Vol 21, Issue 9, p2523
- ISSN
0957-4530
- Publication type
Article
- DOI
10.1007/s10856-010-4110-9