Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration
AbstractChitosan membranes can undergo a glass transition at room temperature triggered by hydration. The mechanical properties of the membranes were followed by a tension test and dynamic mechanical analysis (DMA), with the sample in wet conditions after being immersed in varying compositions of water/ethanol mixtures. Results show that with the increasing of water content, the Young’s and storage modulus decrease systematically. For water contents of ca. 35 vol%, chitosan (CHT) exhibits a glass transition, showing an elastomeric plateau in the elastic modulus above this hydration level and the occurrence of a peak in the loss factor. Due to the semi-crystalline nature of CHT, membranes of this biomaterial present a shape memory capability induced by water uptake. By fixation of the permanent shape by further covalent cross-linking, the membranes can have different permanent shapes appropriate for different applications, including in the biomedical area.
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Correia, C.O.; Caridade, S.G.; Mano, J.F. Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration. Polymers 2014, 6, 1178-1186.
Correia CO, Caridade SG, Mano JF. Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration. Polymers. 2014; 6(4):1178-1186.Chicago/Turabian Style
Correia, Cristina O.; Caridade, Sofia G.; Mano, João F. 2014. "Chitosan Membranes Exhibiting Shape Memory Capability by the Action of Controlled Hydration." Polymers 6, no. 4: 1178-1186.