Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 303, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201800144
Keywords
double network hydrogels; dynamic covalent bonds; facile shape memory; multiresponsive
Funding
- National Natural Science Foundation of China [21774138, 51773215, 21504100]
- Chinese Academy of Sciences [QYZDB-SSW-SLH036]
- Project of International Co-operation Foundation of Ningbo [2017D10014]
- Natural Science Foundation of Zhejiang [LY17B040003, LY17B040004]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2017337]
- Key Laboratory of Marine Materials and Related Technologies [2016Z01, 2017K03]
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An off-the-shelf hydrogel with high-efficiency shape memory property is designed on the basis of the dynamic borax-diol chemistry. The system is facilely prepared from only several unmodified commercially available components: acrylamide (AAm), bis-acrylamide (Bis), poly(vinyl alcohol) (PVA), and borax. The chemically crosslinked poly(acrylamide) network works to fix the permanent shapes of the hydrogel, while the dynamic PVA-borax boronate ester bonds serve as the reversible crosslinks to memorize the deformed temporary shapes. Retreatment of the hydrogel in acid/glucose solutions dissipates the PVA-borax ester bonds to recover its permanent shape. Because of the highly invertible nature of borax-diol chemistry, the developed hydrogel system is characterized by high shape memory/recovery ratios, continuously adjusted shape memory/recovery rates, thus having a wealth of potential applications.
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