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High-Toughness Polycation Cross-Linked Triblock Copolymer Hydrogels
journal contribution
posted on 2017-04-26, 19:04 authored by Yaoyao Chen, Kenneth R. ShullPoly(methyl methacrylate)–poly(methacrylic
acid)–poly(methyl
methacrylate) (PMMA–PMAA–PMMA) triblock copolymers can
self-assemble into well-defined elastic hydrogels in water by forming
glassy PMMA micelle cores connected with PMAA bridges. The stiffness
and toughness of these hydrogels are enhanced substantially by introducing
partially quaternized poly(4-vinylpyridine) (QVP) into the system.
Interactions between the QVP and PMAA molecules provide an energy
dissipation mechanism, with fracture energies in excess of 1000 J/m2 obtained in some cases. The materials are fully self-assembled
and are formed by exposing liquid solutions in DMSO to small amounts
of water. The simplicity of gel formation, and the ability to adjust
the chemical and physical characteristics of these materials over
a wide range, make them excellent model systems for fundamental investigations
of the mechanical response of ion-containing gels.
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toughnessPMAA moleculessimplicitymodel systemsmaterialCross-Linkedpolygel formationPMMA micelle coresacidion-containinghydrogelHigh-Toughnesself-assemblecharacteristicself-assembledPolycationchemicalcopolymersTriblockPMAA bridgesQVPInteractionabilityfracture energiessolutiontriblockinvestigationresponseDMSOPolyCopolymerstiffnessenergy dissipation mechanismmethacrylateHydrogelquaternized
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