Journal
ACS MACRO LETTERS
Volume 4, Issue 2, Pages 220-224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.5b00018
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Funding
- National Science Foundation [DMR-1410223]
- National Science Foundation
- University of Florida
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1410223] Funding Source: National Science Foundation
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This report describes the synthesis and characterization of boronate ester-cross-linked hydrogels capable of self-healing behavior at neutral and acidic pH. This atypically wide pH range over which healing behavior is observed was achieved through the use of an intramolecular coordinating boronic acid monomer, 2-acrylamidophenylboronic acid (2APBA), where the internal coordination helped to stabilize cross-links formed at acidic and neutral pH. Two different hydrogels were formed from a 2APBA copolymer cross-linked with either poly(vinyl alcohol) or a catechol-functionalized copolymer. The self-healing ability of these hydrogels was characterized through physical testing and rheological studies. Furthermore, the catechol cross-linked hydrogel was shown to be oxygen sensitive, demonstrating reduced self-healing and stress relaxation after partial oxidation. The synthesis of these hydrogels demonstrates a new strategy to produce boronic acid materials capable of self-healing at physiological pH.
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