Humidity-activated Shape Memory Effects on Thermoplastic Starch/EVA Blends and Their Compatibilized Nanocomposites
Autores
Sessini, Valentina; Raquez, Jean-Marie; Lourdin, Denis; Maigret, Jean-Eudes; Kenny, José María; [et al.]Fecha de publicación
2017-11-15Cita bibliográfica
Macromolecular Chemistry and Physics, 2017, v. 218, n. 24, p. 1700388
Palabras clave
blends
compatibilizer effect
EVA
humidity-mechanical cycles
shape memory
TPS
Tipo de documento
info:eu-repo/semantics/article
Versión
info:eu-repo/semantics/publishedVersion
Derechos
Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
© 2017 WILEY-VCH
Derechos de acceso
info:eu-repo/semantics/openAccess
Resumen
In this work, a systematic study on the humidity-activated shape memory properties of dual-responsive shape memory bionanocomposites with both humidity- and thermally-activated shape memory effects is reported. The study is performed through humidity-mechanical cycles in an Instron machine with a temperature chamber equipped with an ultrasonic humidity generator. In particular, the bionanocomposites studied are based on blends of ethylene&-vinyl acetate (EVA) and thermoplastic starch reinforced with natural bentonite. In our previous work, thermomechanical cycles are performed by using EVA-induced crystallization and a preliminary humidity-activated shape memory test is designed. Herein, the shape memory results of both blends and their nanocomposites reflect the very good ability to humidity-activated recover of the initial shape with values higher than 80%. Moreover, the ability to fix the temporary shape of this systems is very good, especially when nanofillers are added. The compatibilizer effect of natural bentonite is demonstrated by means of different techniques such as scanning emission microscopy and mapping by confocal Raman spectroscopy.
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