Chain dimension of polyampholytes in solution and immobilized brush states

Moriya Kikuchi, Yuki Terayama, Tatsuya Ishikawa, Taiki Hoshino, Motoyasu Kobayashi, Hiroki Ogawa, Hiroyasu Masunaga, Jun Ichiro Koike, Misao Horigome, Kazuhiko Ishihara, Atsushi Takahara

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40 Citations (Scopus)

Abstract

The dimensions and intermolecular interactions of surface-grafted and unbound, free polyampholytes, poly3-(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 (C s). The free PMAPS and PMPC fractionated by a recycling preparative size-exclusion chromatography system were characterized in aqueous NaCl solutions for C s over a range from 0 to 5.0 M by static light scattering and dynamic light scattering (DLS) measurements. The hydrodynamic radius (R H) and the concentration coefficient of the diffusion coefficient (k D) for PMPC were independent of C s, whereas those for PMAPS were strongly dependent on C s. 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 C s 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.

Original languageEnglish
Pages (from-to)121-130
Number of pages10
JournalPolymer Journal
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 1 2012

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Materials Chemistry

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    Kikuchi, M., Terayama, Y., Ishikawa, T., Hoshino, T., Kobayashi, M., Ogawa, H., Masunaga, H., Koike, J. I., Horigome, M., Ishihara, K., & Takahara, A. (2012). Chain dimension of polyampholytes in solution and immobilized brush states. Polymer Journal, 44(1), 121-130. https://doi.org/10.1038/pj.2011.116