期刊
POLYMER DEGRADATION AND STABILITY
卷 152, 期 -, 页码 126-138出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2018.04.012
关键词
Shape memory; Thermally-activated; PLA/PCL blend; Nanocomposites; CNC
资金
- Spanish Ministry of Economy, Industry and Competitiveness (MINEICO) [MAT2017-88123-P]
- POLYMAGIC [PCIN-2017-036]
- FEDER funds
- Regional Government of Madrid [S2013/MIT-2862]
- Juan de la Cierva contract from the MINEICO [FJCI-2014-20630]
- Ramon y Cajal contract from the MINEICO [RYC-2014-15595]
- CSIC [I-Link1149]
In this work the thermally-activated shape memory response of biodegradable nanocomposites based on PLA/PCL blend reinforced with different type of cellulose nanocrystals has been reported, and compared with those of the neat matrix, at the same transition temperature of 55 degrees C and at the same different deformations, 50%, 100% and 150%. In particular, cellulose nanocrystals have been synthesized and then functionalized by grafting from reaction by ring opening polymerization of both PLLA and PCL using the OH groups onto the cellulose nanocrystals surface as initiators for the reaction. The morphology, thermal and mechanical analysis have been performed in order to obtain the parameters for the thermomechanical shape memory cycles. Moreover, the addition of the CNC-based nanofillers on the compatibility of PLA-PCL blends in 70:30 proportion has been evaluated. All the biodegradable nanocomposite formulations showed excellent shape memory response, similar to those of the neat matrix, with strain recovery ratio and strain fixity ratio higher than 80% and 90%, respectively. This fact indicates that in this case, the shape memory response of the nanocomposites is mainly controlled by the response of the neat blend and they are slightly influenced by the increase of compatibility between the components of the blend. In addition, all nanocomposite films were fully disintegrated under composting conditions confirming their biodegradable nature, obtaining that the presence of CNC-based nanofillers speeds up the disintegration rate of the nanocomposites in comparison with the pure matrix. (C) 2018 Elsevier Ltd. All rights reserved.
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