Effect of graphite nanoplatelets on melt drawing and properties of PCL/PLA microfibrillar composites

0493937 - ÚMCH 2019 RIV US eng J - Článek v odborném periodiku
Kelnar, Ivan - Kratochvíl, Jaroslav - Fortelný, Ivan - Kaprálková, Ludmila - Zhigunov, Alexander - Nevoralová, Martina
Effect of graphite nanoplatelets on melt drawing and properties of PCL/PLA microfibrillar composites.
Polymer Composites. Roč. 39, č. 9 (2018), s. 3147-3156. ISSN 0272-8397. E-ISSN 1548-0569
Grant CEP: GA ČR(CZ) GA13-15255S
Institucionální podpora: RVO:61389013
Klíčová slova: graphite * biodegradable materials * microfibrillar composites
Obor OECD: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impakt faktor: 2.268, rok: 2018

The study deals with upgrading of a poly (epsilon‐caprolactone) (PCL)‐based biodegradable material using graphite nanoplatelets‐aided in‐situ formation of reinforcing microfibers, that is, preparation of a microfibrillar composite (MFC) based on the PCL/poly lactic acid (PLA) 80/20 blend. Recently, we have found that effective melt‐drawing is impossible due to flow instability and that PLA fibrils formation is only possible with addition of high‐aspect‐ratio nanofillers (NF), such as momtmorillonite or halloysite. This work concerns modification of the PCL/PLA blend with graphite nanoplatelets (GNPs). Results indicate that relatively large GNPs excellently support stability of extrusion which leads to better drawability in comparison with other NF. Hence, reinforcement of the components by GNP and fibrils formation accompanied by increased PLA crystallinity lead to a biocompatible and biodegradable material with good performance. Increased PLA crystallinity due to its annealing during subsequent processing and substantial suppression of cold crystallization is another advantage of the MFC concept in the PCL/PLA system.
Trvalý link: http://hdl.handle.net/11104/0287315