Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 2, Issue 43, Pages 7631-7638Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tb01289e
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Funding
- PolyU Internal Fund [A-PK90, G-UC30]
- Hong Kong Innovation and Technology Fund [ITS/237/12]
- National Nature Science Foundation of China [51373146]
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Recoverable hydrogels with high stretch and toughness have been synthesized by a one-step radical polymerization. They consist of covalently crosslinked polyacrylamide (PAAm) and ionically crosslinked carrageenan. Such double network (DN) hydrogels can be stretched beyond 20 times their initial length, and their fracture energy reached a high value of similar to 9500 J m(-2). By comparing hydrogel tensile properties at different temperatures, the contribution of ionic network to the toughness was quantitatively determined in percentage for the first time. The stretched hydrogels were completely healed by short treatment at a mild temperature. Through drying at stretch, they were also transformed into stiff absorbent fibers that still preserved their shape memory of wet state.
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