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    Humidity-activated shape memory effect on plasticized starch-based biomaterials

    Year: 2018

    Journal: Carbohydr. Polym., Volume 179, JAN 1, page 93–99

    Authors: Sessini, Valentina; Arrieta, Marina P.; Fernandez-Torres, Alberto; Peponi, Laura

    Organizations: Spanish Ministry of Economy and Competitiveness, MINECO [MAT2013-48059-C2-1-R]; Juan de la Cierva [FJCI-2014-20630]; Ramon y Cajal [RYC-2014-15595]; MINECO; I-LINK project [I-LINK1149]

    Keywords: Starch; Shape memory; Bending; Catechin; Humidity

    Humidity-activated shape memory behavior of plasticized starch-based films reinforced with the innovative combination of starch nanocrystals (SNCs) and catechin as antioxidant were studied. In a previous work, we reported the processing of gelatinized starch-based films filled with SNCs and catechin as antioxidant agent, and we observed that this novel combination leads to starch-based film with enhanced thermal and mechanical performance. In this work, the humidity-activated shape memory behavior of the previous developed starch-based films was characterized. The moisture loss as well as the moisture absorption were studied since they are essential parameters in humidity-activated shape memory polymers to fix the temporary shape and to recover the original shape, respectively. Therefore, the effect of the incorporation of SNCs and catechin on the humidity-activated shape memory properties of plasticized starch was also studied. Moreover, the effectiveness of catechin to increase the polymer stability under oxidative atmosphere and the thermo-mechanical relaxation of all the starch-based materials were studied. The combination of plasticized starch matrix loaded with both, SNCs and catechin, leads to a multifunctional starch-based films with increased hydrophilicity and with excellent humidity-activated shape memory behavior with interest for potential biomedical applications.
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