Abstract
SummaryCharacteristic properties of zwitterionic nanocomposite (NC) gels consisting of a sulfobetaine copolymer and inorganic clay were investigated. The zwitterionic NC gels were synthesized with different ratios of monomer (x) and clay content (n) by the in situ free‐radical polymerization of two monomers, a sulfobetaine monomer (A3) and acrylamide derivative (D), in the presence of exfoliated clay in aqueous media. The resulting zwitterionic A3Dx‐NCn gels were all structurally uniform and mechanically tough because of the polymer–clay network. A3Dx‐NCn gels exhibited a thermoresponsive phase transition with an upper critical solution temperature (UCST) for x ≤ 10 and n ≤ 5. The changes in the property of the A3D10‐NC3 gel across the UCST transition were elucidated in terms of optical transmittance, gel volume, dynamic viscoelasticity, and tensile mechanical properties, in addition to the change in self‐healing behavior.
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