Effect of platy and tubular nanoclays on behaviour of biodegradable PCL/PLA blend and related microfibrillar composites

0468292 - ÚMCH 2017 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Kelnar, Ivan - Kratochvíl, Jaroslav
Effect of platy and tubular nanoclays on behaviour of biodegradable PCL/PLA blend and related microfibrillar composites.
AIP Conference Proceedings 1736. Melville: American Institute of Physics, 2016 - (D’Amore, A.; Acierno, D.; Grassia, L.), s. 1-4, č. článku 020013. ISBN 978-0-7354-1390-0. ISSN 0094-243X.
[International Conference on "Times of Polymers (TOP) & Composites" /8./. From Aerospace to Nanotechnology. Ischia (IT), 19.06.2016-23.06.2016]
Grant CEP: GA ČR(CZ) GA13-15255S
Institucionální podpora: RVO:61389013
Klíčová slova: poly (epsilon-caprolactone) * poly (lactic acid) * microfibrillar composites
Kód oboru RIV: JI - Kompozitní materiály

Blending of ductile poly(epsilon-caprolactone) (PCL) and rigid polylactic acid (PLA) is a promising way to tailor biodegradable materials with broad range of properties. But the mutual incompatibility of both polyesters leads to compromised behaviour only. Alternative to PCL/PLA blends is application of PLA in the form of short fibres, however, difficult dispergation of flexible fibres including their poor adhesion and limited processing is a significant restriction. More effective is in situ formation of polymeric fibre-reinforced materials using microfibrillar composites (MFC) concept based on melt- or cold-drawing of a polymer blend. Important advantage of MFC is efficient dispersion and bonding of in-situ formed reinforcing fibres This work deals with combination of structure-directing and reinforcing effects of montmorillonite (oMMT) and halloysite nanotubes (HNT) in the PCL/PLA 80/20 blend with in-situ formation of PLA fibrils in the PCL matrix. In the resulting microfibrillar composite, reinforcement by rigid PLA fibrils is combined with strengthening of both components by the nanofiller (NF). Moreover, PLA fibrils formation via melt-drawing is only possible after nanofiller addition due to favourable affecting of rheological parameters of the polymer components. The structure-properties relationship and complex effect of NF on microfibrillar composite performance, causing e.g., quite comparable parameters of both microfibrillar composites in spite of lower reinforcing effect of halloysite nanotubes on components, are discussed.
Trvalý link: http://hdl.handle.net/11104/0266302