Thermally-activated shape memory effect on biodegradable nanocomposites based on PLA/PCL blends reinforced with hydroxyapatite
Authors
Peponi, Laura; Sessini, Valentina; Arrieta, Marina Patricia; Navarro-Baena, Iván; Sonseca, Agueda; [et al.]Identifiers
Permanent link (URI): http://hdl.handle.net/10017/43763DOI: 10.1016/j.polymdegradstab.2018.02.019
ISSN: 0141-3910
Date
2018-02-27Bibliographic citation
Polymer Degradation and Stability, 2018, v. 151, p. 36-51
Keywords
Biodegradable blends
Nanocomposites
Nanosized hydroxyapatite
PCL
PLA
Shape memory
Document type
info:eu-repo/semantics/article
Version
info:eu-repo/semantics/publishedVersion
Rights
Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
© Elsevier
Access rights
info:eu-repo/semantics/openAccess
Abstract
In this work, the effect of the addition of different amount of nanosized hydroxyapatite (nHA) on the shape memory behavior of blends based on poly (lactic acid) (PLA) and poly (epsilon-caprolactone) (PCL) has been studied. In particular PLA/PCL blend with 70 wt % PLA has been reinforced with 0.5, 1 and 3 wt % nHA. Moreover, the relationship between the morphology and the final properties of the nanocomposites has been investigated by field emission scanning electron microscopy, confocal Raman spectroscopy and atomic force microscopy. In particular, PeakForce has been used to study quantitative nanomechanical properties of the multifunctional materials leading to conclusion that nHA increase the phase separation between PLA and PCL as well as act as reinforcements for the PCL-rich phase of the nanocomposites. Furthermore, excellent thermally-activated shape memory response has been obtained for all the nanocomposites at 55 degrees C. Finally, the disintegration under composting conditions at laboratory scale level was studied in order to confirm the biodegradable character of these nanocomposites. Indeed, these materials are able to be used for biomedical issues as well as for packaging applications where both thermally-activated shape memory effect and biodegradability are requested.
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