Monomer volume fraction profiles in pH responsive planar polyelectrolyte brushes

Mahalik, Jyoti P.; Yang, Yubo; Deodhar, Chaitra V.; Ankner, John Francis; Lokitz, Bradley S.; Kilbey, II, S. Michael; Sumpter, Bobby G.; Kumar, Rajeev

doi:10.1002/polb.24008

Title: Monomer volume fraction profiles in pH responsive planar polyelectrolyte brushes

Journal Article · Sun Mar 06 00:00:00 EST 2016 · Journal of Polymer Science. Part B, Polymer Physics

DOI:https://doi.org/10.1002/polb.24008· OSTI ID:1240518

Mahalik, Jyoti P. ^[1]; Yang, Yubo ^[1]; Deodhar, Chaitra V. ^[1]; Ankner, John Francis ^[1]; Lokitz, Bradley S. ^[1]; Kilbey, II, S. Michael ^[1]; Sumpter, Bobby G. ^[1]; Kumar, Rajeev ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Spatial dependencies of monomer volume fraction profiles of pH responsive polyelectrolyte brushes were investigated using field theories and neutron reflectivity experiments. In particular, planar polyelectrolyte brushes in good solvent were studied and direct comparisons between predictions of the theories and experimental measurements are presented. The comparisons between the theories and the experimental data reveal that solvent entropy and ion-pairs resulting from adsorption of counterions from the added salt play key roles in affecting the monomer distribution and must be taken into account in modeling polyelectrolyte brushes. Furthermore, the utility of this physics-based approach based on these theories for the prediction and interpretation of neutron reflectivity profiles in the context of pH responsive planar polyelectrolyte brushes such as polybasic poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and polyacidic poly(methacrylic acid) (PMAA) brushes is demonstrated. The approach provides a quantitative way of estimating molecular weights of the polymers polymerized using surface-initiated atom transfer radical polymerization.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1240518

Journal Information:: Journal of Polymer Science. Part B, Polymer Physics, Journal Name: Journal of Polymer Science. Part B, Polymer Physics; ISSN 0887-6266

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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