Size particle effects on the thermal stability of poly(lactic acid) / hydroxyapatite hybrids for biodegradable package

• Published in: Ceramics international 2020-04, Vol.46 (6), p.7288-7297
• Main Authors: Zaharescu, T., Tardei, C., Râpă, M., Iordoc, M.
• Format: Article
• Language: English
• Subjects: Degradation; HAp; Irradiation; Packaging materials; PLA
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2019.11.223

The effects of two nano– and micro– size classes of hydroxyapatite particles ((Ca10(PO4)6(OH)2), HAp) on the controlled stability behavior of poly(lactic acid) are investigated by chemiluminescence, thermal analysis, water uptake and contact angle measurements. The accelerated degradation was achieved by γ-irradiation, when the two constitutive phases interact at the boundary limit partially blocking oxidation. In this paper we studied and characterized the influence of specific particle areas on various material properties, namely thermal and radiation strengths, water diffusion, and wettability. The better behavior of nanostructured patters is explained by the larger adsorption action and the unlike scavenging interaction between free radicals and filler particles. We also analyzed the interaction between the basic material and filler when the loading concentration is changed. The higher stabilization efficiency of PLA/nHAp systems offered by our present results recommends the selection of nanocomposite hybrids as the suitable composition for the manufacture of long life products including medical wear.