Graphite nanoplatelets-modified PLA/PCL: effect of blend ratio and nanofiller localization on structure and properties

0473963 - ÚMCH 2018 RIV NL eng J - Článek v odborném periodiku
Kelnar, Ivan - Kratochvíl, Jaroslav - Kaprálková, Ludmila - Zhigunov, Alexander - Nevoralová, Martina
Graphite nanoplatelets-modified PLA/PCL: effect of blend ratio and nanofiller localization on structure and properties.
Journal of the Mechanical Behavior of Biomedical Materials. Roč. 71, July (2017), s. 271-278. ISSN 1751-6161. E-ISSN 1878-0180
Grant CEP: GA ČR(CZ) GA16-03194S
Institucionální podpora: RVO:61389013
Klíčová slova: poly (epsilon-caprolactone) * poly (lactic acid) * graphite nanoplatelets
Obor OECD: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impakt faktor: 3.239, rok: 2017

Structure and properties of poly(lactic acid) (PLA)/poly (epsilon-caprolactone) (PCL) influenced by graphite nanoplatelets (GNP) were studied in dependence on blend composition. Electron microscopy indicates predominant localization of GNP in PCL. GNP-induced changes in viscosity hinder refinement of PCL inclusions, support PCL continuity in the co-continuous system, and lead to reduction of PLA inclusions size without GNP being present at the interface in the PCL-matrix blend. Negligible differences in crystallinity of both phases indicate that mechanical behaviour is mainly influenced by reinforcement and GNP-induced changes in morphology. Addition of 5 parts of GNP leads to ~40% and ~25% increase of stiffness in the PCL- and PLA-matrix systems, respectively, whereas the reinforcing effect is practically eliminated in the co-continuous systems due to GNP-induced lower continuity of PLA which enhances toughness. Impact resistance of the 80/20 blend shows increase with 5 parts content due to synergistic effect of PCL/GNP stacks, whereas minor increase in the blend of the ductile PCL matrix with brittle PLA inclusions is caused by GNP-modification of the component parameters. Results indicate high potential of GNP in preparing biocompatible systems with wide range of structure and properties.
Trvalý link: http://hdl.handle.net/11104/0271130