Abstract
The dimensions and intermolecular interactions of surface-grafted and unbound, free polyampholytes, poly[3-(N-2-methacryloyloxyethyl-N,N-dimethyl) ammonatopropanesulfonate] (PMAPS) and poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC), were estimated in an aqueous NaCl solution over a wide range of salt concentrations (Cs). The free PMAPS and PMPC fractionated by a recycling preparative size-exclusion chromatography system were characterized in aqueous NaCl solutions for Cs over a range from 0 to 5.0 M by static light scattering and dynamic light scattering (DLS) measurements. The hydrodynamic radius (RH) and the concentration coefficient of the diffusion coefficient (kD) for PMPC were independent of Cs, whereas those for PMAPS were strongly dependent on Cs. Monodisperse silica nanoparticles immobilized with PMAPS (SiNP-PMAPS) and PMPC (SiNP-PMPC) by surface-initiated atom transfer radical polymerization were characterized in aqueous NaCl solutions for Cs over a range from 0 to 5.0 M by DLS and synchrotron radiation small-angle X-ray scattering (SAXS) measurements. The SAXS profiles from SiNP-PMAPS and SiNP-PMPC solutions were well described by the core-shell model, taking into account interacting self-avoiding chains and assuming a Schulz-distributed core with two fitting parameters.
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Acknowledgements
We thank Nissan Chemical Industries for kindly giving us the silica nanoparticles used in this study. The synchrotron radiation experiments were performed at BL03XU in the SPring-8 facility with the approval of the Japan Synchrotron Radiation Institute (JASRI) (Proposal No. 2010A 7239). We sincerely appreciate Professor Hiroshi Jinnai of JST, ERATO Takahara soft interfaces project for many valuable comments.
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Kikuchi, M., Terayama, Y., Ishikawa, T. et al. Chain dimension of polyampholytes in solution and immobilized brush states. Polym J 44, 121–130 (2012). https://doi.org/10.1038/pj.2011.116
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DOI: https://doi.org/10.1038/pj.2011.116
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