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        Preparation of Responsive Zwitterionic Diblock Copolymers Containing Phosphate and Phosphonate Groups

        Yasemin Samav,Bernice Akpinar,Gökhan Kocak,Vural Bütün 한국고분자학회 2020 Macromolecular Research Vol.28 No.12

        In this study, novel zwitterionic diblock copolymers, namely poly(2-(Nmorpholino) ethyl methacrylate))-block-poly(2-(methacryloyloxy)ethyl phosphate) (PMEMA-b-PMOEP) and poly(2-(N-morpholino)ethyl methacrylate))-block-poly ((methacryloyloxy)methyl phosphonic acid) (PMEMA-b-PMOMP), were synthesized via reversible addition-fragmentation chain transfer controlled radical polymerization. Solution properties of these phosphorus-based diblock copolymers were investigated using dynamic light scattering, transmission electron microscopy and proton nuclear magnetic resonance spectroscopy. Since the PMEMA block has both saltand thermo-responsive properties, PMEMA-b-PMOEP and PMEMA-b-PMOMP diblock copolymers formed core-shell micelles in basic aqueous media as the PMEMA block formed insoluble micelle core with the addition of Na2SO4 or an increase in temperature in basic solution. Additionally, PMEMA-b-PMOMP diblock copolymers interacted strongly with calcium cations and yielded reverse micellar structures via complexation of phosphate with metal cation in aqueous media.

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