Abstract
Cononsolvency refers to the phenomenon in which a polymer collapses in mixtures of good solvents with specific compositions. The coil-to-globule-to-coil transitions of a zwitterionic polymer, poly(2-[(N-2-methacryloyloxyethyl-N,N-dimethyl)ammonio]acetate) (PCB2), in water, ethanol, and water–ethanol mixed solvents were investigated and compared with those of poly[2-(methacryloyloxy)ethyl phosphorylcholine] (PMPC). PCB2 showed cononsolvency in water–ethanol mixed solvents with specific ethanol volume fractions. The reentrant square well-type sharp coil–globule transition was reproduced by a statistical mechanical model involving competitive hydrogen bonding and cooperative hydration. PCB2 showed a broader cononsolvency range than PMPC because of its lower association constants of water and ethanol and the marked competition for hydrogen bonding. The zwitterion-specific cononsolvency characteristics were rationalized with the electrostatic potentials and van der Waals energies of the zwitterions.
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Acknowledgements
This work was supported by JSPS KAKENHI Grant Numbers JP22H02147 (Grant-in-Aid for Scientific Research (B)) and JP22H04555, JP19H05714 (Grant-in-Aid for Scientific Research on Innovative Area: Aquatic Functional Materials). Y.H. acknowledges the Tokuyama Science Foundation and the KOSÉ Cosmetology Research Foundation for financial support. This work was supported by the Oita University President’s Strategic Discretionary Fund. This work was partially supported by the Cooperative Research Program of the Network Joint Research Center for Materials and Devices. The authors acknowledge Y. Saruwatari (Osaka Organic Chemical Industry Ltd.) for a kind donation of the carboxybetaine methacrylate monomer. We thank D. Ihara for assistance with the statistical mechanical model simulations. We thank Kathryn Sole, PhD, from Edanz (https://jp.edanz.com/ac) for editing a draft of this paper.
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The paper was written with contributions from all authors, and all authors have approved the final version of the paper. Y.H. conceived and directed the project. N.K., T.M., and M.N. performed the experiments and analyzed the results. E.H. contributed to the DLS experiments.
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Higaki, Y., Kuraoka, N., Masuda, T. et al. Cononsolvency of poly(carboxybetaine methacrylate) in water–ethanol mixed solvents. Polym J 55, 869–876 (2023). https://doi.org/10.1038/s41428-023-00780-x
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DOI: https://doi.org/10.1038/s41428-023-00780-x