Group 'Materials + Technologies', Department of Chemical and Environmental Engineering, Faculty of Engineering of Gipuzkoa, University of the Basque Country, Pza Europa 1, Donostia-San Sebastian 20018, Spain.
Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland.
Biomacromolecules. 2020 Jun 8;21(6):2032-2042. doi: 10.1021/acs.biomac.9b01764. Epub 2020 Apr 23.
Hybrid bionanocomposites with shape-memory behavior are reported. The materials were accessed by combining a polyurethane matrix with a highly renewable carbon content, cellulose nanocrystals (CNCs), and magnetite nanoparticles (MNPs). The integration of the two nanoparticle types resulted in tough materials that display a higher stiffness and storage modulus in the glassy and rubbery state, thus contributing to the structural reinforcement, as well as magnetic properties, reflecting a synergistic effect of this combination. A quantitative characterization of the thermoactivated shape-memory effect made evident that the addition of CNCs increases the shape fixity, due to the higher glass transition temperature () and the higher stiffness below than the neat PU, while the addition of MNPs made it possible to activate the shape recovery by applying an alternating magnetic field. Moreover, the new hybrid bionanocomposites showed good bio- and hemocompatibility.
具有形状记忆行为的杂化生物纳米复合材料。该材料是通过将聚氨酯基质与高可再生碳含量、纤维素纳米晶体（CNC）和磁铁矿纳米粒子（MNP）结合而获得的。两种纳米粒子类型的结合导致材料具有韧性，在玻璃态和橡胶态下表现出更高的刚性和储能模量，从而有助于结构增强以及磁性能，反映了这种组合的协同效应。对热激活形状记忆效应的定量表征表明，添加 CNC 会由于较高的玻璃化转变温度（Tg）和低于纯 PU 的刚性而增加形状固定性，而添加 MNP 则可以通过施加交变磁场来激活形状恢复。此外，新型杂化生物纳米复合材料表现出良好的生物和血液相容性。
