Facile preparation of biocompatible poly (lactic acid)-reinforced poly(.epsilon.-caprolactone) fibers via graphite nanoplatelets -aided melt spinning

0489984 - ÚMCH 2019 RIV NL eng J - Journal Article
Kelnar, Ivan - Zhigunov, Alexander - Kaprálková, Ludmila - Fortelný, Ivan - Dybal, Jiří - Kratochvíl, Jaroslav - Nevoralová, Martina - Hricová, M. - Khunová, V.
Facile preparation of biocompatible poly (lactic acid)-reinforced poly(.epsilon.-caprolactone) fibers via graphite nanoplatelets -aided melt spinning.
Journal of the Mechanical Behavior of Biomedical Materials. Roč. 84, August (2018), s. 108-115. ISSN 1751-6161. E-ISSN 1878-0180
R&D Projects: GA ČR(CZ) GA16-03194S
Institutional support: RVO:61389013
Keywords : poly (ɛ-caprolactone) * poly (lactic acid) * melt spinning
OECD category: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics
Impact factor: 3.485, year: 2018

Addition of high-aspect-ratio (AR) nanofillers can markedly influence flow behavior of polymer systems. As a result, application of graphite nanoplatelets (GNP) allows preparation of microfibrillar composites (MFC) based on PCL matrix reinforced with in-situ generated PLA fibrils. This work deals, for the first time, with preparation of analogous melt-drawn fibers. Unlike other blend-based fibers, the spinning and melt drawing leads to structure of deformed inclusions due to unfavorable ratio of rheological parameters of components. Subsequent moderate cold drawing of the system with dissimilar deformability of components causes strengthening with PLA fibrils. Unexpectedly, high velocity and extent of cold drawing leads to structure with low-AR inclusions, similar to the original melt-drawn blend. Extensive fast deformation of the soft PCL matrix does not allow sufficient stress transfer to rigid PLA. In spite of peculiarities found, the GNP-aided melt spinning allows facile preparation of biodegradable biocompatible fibers with wide range of diameters (80–400 µm) and parameters (2.35–18 cN/tex).
Permanent Link: http://hdl.handle.net/11104/0284276