期刊
POLYMER DEGRADATION AND STABILITY
卷 151, 期 -, 页码 36-51出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2018.02.019
关键词
Biodegradable blends; PLA; PCL; Nanocomposites; Nanosized hydroxyapatite; Shape memory
资金
- Spanish Ministry of Economy, Industry and Competitiveness, MINEICO [MAT2017-88123-P]
- Regional Government of Madrid [S2013/MIT-2862]
- MINEICO [FJCI-2014-20630, RYC-2014-15595]
- CSIC for the I-Link project [I-Link1149]
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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