Woodfield, Peter A.; Zhu, Yicheng; Pei, Yiwen; Roth, Peter J. published the artcile< Hydrophobically Modified Sulfobetaine Copolymers with Tunable Aqueous UCST through Postpolymerization Modification of Poly(pentafluorophenyl acrylate)>, SDS of cas: 71195-85-2, the main research area is hydrophobic pendant sulfobetaine copolymer postpolymn modification aqueous solution UCST.
Polysulfobetaines, polymers carrying highly polar zwitterionic side chains, present a promising research field by virtue of their antifouling properties, hemocompatibility, and stimulus-responsive behavior. However, limited synthetic approaches exist to produce sulfobetaine copolymers comprising hydrophobic components. Postpolymn. modification of an activated ester precursor, poly-(pentafluorophenyl acrylate), employing a zwitterionic amine, 3-((3-aminopropyl)-dimethylammonio)-propane-1-sulfonate, ADPS, is presented as a novel, 1-step synthetic concept toward sulfobetaine (co)-polymers. Modifications were performed in homogeneous solution using propylene carbonate as solvent with mixtures of ADPS and pentylamine, benzylamine, and dodecylamine producing well-defined statistical acrylamido sulfobetaine copolymers containing hydrophobic pentyl, benzyl, or dodecylacrylamide comonomers with well-controllable molar composition as evidenced by NMR and FTIR spectroscopy and size exclusion chromatog. This synthetic strategy was exploited to study, for the first time, the influence of hydrophobic modification on the upper critical solution temperature (UCST) of sulfobetaine copolymers in aqueous solution Surprisingly, incorporation of pentyl groups increases solubility over a wide composition range, whereas benzyl groups decreased solubility, an effect attributed to different entropic and enthalpic contributions of both functional groups. While UCST transitions of polysulfobetaines are typically limited to higher molar mass samples, incorporation of 0-65 mol.% of benzyl groups into copolymers with molar masses 25.5-34.5 kg/mol enabled sharp, reversible transitions 6-82° in solutions containing ≤76 mM NaCl, as observed by optical transmittance and dynamic light scattering. Both synthesis and systematic UCST increase of sulfobetaine copolymers presented here are expected to expand the scope and applicability of these smart materials.
Macromolecules (Washington, DC, United States) published new progress about Cloud point. 71195-85-2 belongs to class esters-buliding-blocks, and the molecular formula is C9H3F5O2, SDS of cas: 71195-85-2.
Referemce:
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