期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 18, 页码 15785-15790出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b02953
关键词
sequential folding ion-gel; upper critical solution temperature; poly(N-isopropylacrylamide); microactuator
资金
- National Science Foundation [NSF DMR-1609972]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1609972] Funding Source: National Science Foundation
We demonstrate sequential folding of micropatterned polymer actuators by tuning the upper critical solution temperature (UCST) of poly(N-isopropylacrylamide) (PNIPAM) copolymers in the ionic liquid (IL) 1-ethyl-3-methylimidazolium bis(trifluoro-methylsulfonyl) imide. Incorporation of comonomers having different hydrogen-bonding capacities, acrylic acid and methyl acrylate, is shown to shift the UCST of PNIPAM to higher and lower temperatures, respectively. Relying on the ability to tune the transition temperature through copolymerization along with the wide thermal range afforded by the IL as a solvent, we fabricated a photopatterned self-folding device which shows reversible and sequential bending of three sets of hinges. Such sequential and reversible bending of microactuators offers potential for the design of complex self-folding origami and soft robots.
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