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Title

A self‐folding polymer film based on swelling metal–organic frameworks

AuthorsTroyano, Javier ; Carné-Sánchez, Arnau ; Pérez-Carvajal, Javier ; León-Reina, Laura; Imaz, Inhar ; Cabeza, Aurelio; Maspoch, Daniel
KeywordsComposites
Films
Swelling behaviour
Issue Date2018
PublisherWiley-VCH
CitationAngewandte Chemie International Edition 57(47): 15420-15424 (2018)
AbstractHerein, we exploit the well-known swelling behaviour of metal-organic frameworks (MOFs) to create a self-folding polymer film. Namely, we show that incorporating crystals of the flexible MOF MIL-88A into a polyvinylidene difluoride (PVDF) matrix affords a polymer composite film that undergoes reversible shape transformations upon exposure to polar solvents and vapours. Since the self-folding properties of this film correlate directly with the swelling properties of the MIL-88A crystals, it selectively bends to certain solvents and its degree of folding can be controlled by controlling the relative humidity. Moreover, it shows a shape-memory effect at relative humidity values from 60 % to 90 %. As proof of concept, we demonstrate that these composite films can lift cargo and can be used to assemble 3D structures from 2D patterns. Our strategy is a straightforward method for designing autonomous soft materials with folding properties that can be tuned by judicious choice of the constituent flexible MOF.
Publisher version (URL)https://doi.org/10.1002/anie.201808433
URIhttp://hdl.handle.net/10261/199042
DOI10.1002/anie.201808433
ISSN1433-7851
E-ISSN1521-3773
Appears in Collections:(CIN2) Artículos
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