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Title

Thermally-activated shape memory effect on biodegradable nanocomposites based on PLA/PCL blend reinforced with hydroxyapatite

AuthorsPeponi, Laura ; Sessini, Valentina; Arrieta, M. P.; Navarro-Baena, Ivan; Sonseca, Agueda; Dominici, F.; Giménez, E.; Torre, L.; Tercjak, Agnieszka; López, Daniel ; Kenny, José María
KeywordsShape memory
Nanosized hydroxyapatite
Biodegradable blends
Nanocomposites
PCL
PLA
Issue Date2018
PublisherElsevier
CitationPolymer Degradation and Stability 151: 36-51 (2018)
AbstractIn 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 (ε-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 °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.
Publisher version (URL)http://dx.doi.org/10.1016/j.polymdegradstab.2018.02.019
URIhttp://hdl.handle.net/10261/163617
Identifiersdoi: 10.1016/j.polymdegradstab.2018.02.019
issn: 0141-3910
e-issn: 1873-2321
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