Neutron reflectivity study of the structure of pH-responsive polymer brushes grown from a macroinitiator at the sapphire-water interface

Mauro Moglianetti, John R P Webster, Steve Edmondson, Steven P. Armes, Simon Titmuss

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brushes have been grown by surface-initiated atom transfer radical polymerization (SI-ATRP) from a polyanionic macroinitiator adsorbed at the sapphire-water interface, and neutron reflectivity has been used to characterize the structures and pH response of the brushes. The polymer brushes are well-described by Gaussian density profiles with an additional thin, dense layer close to the solid-liquid interface for the thicker brushes at pH 7 and 9, which produces a spike in the density profile. The spike in the distribution accounts for less than 5% of the polymer and disappears as the brushes swell at pH 3. The observed swelling behavior has been used in combination with the predictions of scaling theory and previous experimental measurements to determine the grafted density of PDMAEMA chains. © 2010 American Chemical Society.
    Original languageEnglish
    Pages (from-to)12684-12689
    Number of pages5
    JournalLangmuir
    Volume26
    Issue number15
    DOIs
    Publication statusPublished - 3 Aug 2010

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