Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 22, Pages 12067-12073Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b02234
Keywords
shape memory polymer; physical hydrogel; ultrasound trigger; stimulus-responsive polymer; melamine
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- le Fonds de recherche du Quebec: Nature et technologies (FRQNT)
- China Scholarship Council (CSC)
- Chinese Ministry of Education [313036]
- National Natural Science Foundation of China [51203102]
- FRQNT
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Therapeutic-ultrasound-triggered shape memory was demonstrated for the first time with a melamine-enhanced poly(vinyl alcohol) (PVA) physical hydrogel. The addition of a small amount of melamine (up to. 1.5 wt %) in PVA results in a strong hydrogel due to the. multiple H-bonding between the two constituents. A temporary shape of the hydrogel can be obtained by deformation of the hydrogel (similar to 65 wt % water) at room temperature, followed by fixation of the deformation by freezing/thawing the hydrogel under strain, which induces crystallization of PVA. We show that the ultrasound delivered by a commercially available device designed for the patient's pain relief could trigger the shape recovery process as a result of ultrasound-induced local heating in the hydrogel that melts the crystallized PVA cross-linking. This hydrogel is thus interesting for potential applications because it combines many desirable properties, being mechanically strong, biocompatible, and self-healable and displaying the shape memory capability triggered by a physiological stimulus.
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