Stimuli-Responsive Zwitterionic Microgels with Covalent and Ionic Cross-Linksстатья

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[1] Stimuli-responsive zwitterionic microgels with covalent and ionic cross-links / S. R, W. Richtering, I. I. Potemkin, A. Pich // Macromolecules. — 2018. We describe a facile method for the synthesis of microgels with covalent and noncovalent ionic cross-links. Microgels were synthesized by copolymerization of various Nvinyllactams with zwitterionic monomer (methacryloyloxy)-ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide in the presence of a cross-linking agent (bis(acrylamide)) in waterin-oil emulsion. Monodisperse colloidally stable microgels with a high amount (>30 mol %) of zwitterionic groups were synthesized. High contents of zwitterionic groups in microgels led to the formation of reversible ionic cross-links along with permanent covalent cross-links generated by bis(acrylamide). The obtained microgels exhibit interesting temperaturetriggered swelling/deswelling behavior in aqueous solution. With an increase of the temperature above 10 oC, the microgels swell due to the destruction of the zwitterionic cross-links. Above the lower critical solution temperature of poly(N-vinyllactam) chains at T > 32 oC, the microgels shrink due to the destruction of the hydrogen bonds and enhanced hydrophobic interactions. The variation of zwitterionic groups and cross-linker concentrations influenced the extent of swelling/deswelling at different temperatures. New doubly thermoresponsive microgels were synthesized using three homologues: N-vinylcaprolactam (VCL), N-vinylpiperidone (VPi), and N-vinylpyrrolidone (VPy). It was shown that the temperature-triggered deswelling of microgels is strongly dependent on the size of the lactam ring. [ DOI ]

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