%0 Journal Article 
%A Sessini, Valentina
%A Navarro-Baena, Iván
%A Arrieta, Marina Patricia
%A Dominici, Franco
%A Lopez, Daniel
%A Torre, Luigi
%A Kenny, José María
%A Dubois, Philippe
%A Raquez, Jean-Marie
%A Peponi, Laura
%T Effect of the addition of polyester-grafted-cellulose nanocrystals on the shape memory properties of biodegradable PLA/PCL bionanocomposites
%D 2018
%@ 0141-3910
%U http://hdl.handle.net/10017/43756
%X 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  °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 thermo-mechanical 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.
%K Shape memory
%K Thermally-activated
%K PLA/PCL blend
%K Nanocomposites
%K CNC
%K Química
%K Chemistry
%~ Biblioteca Universidad de Alcala