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  • Title: Stimuli-responsive surfaces using polyampholyte polymer brushes prepared via atom transfer radical polymerization.
    Author: Ayres N, Cyrus CD, Brittain WJ.
    Journal: Langmuir; 2007 Mar 27; 23(7):3744-9. PubMed ID: 17319701.
    Abstract:
    The synthesis of AB diblock copolymer polyampholyte polymer brushes of the type Si/SiO2//poly(acrylic acid-b-vinyl pyridine) prepared using atom transfer radical polymerization is reported. Both 2- and 4-vinyl pyridine have been used. The diblock polyampholyte polymer brushes demonstrate stimuli-responsive behavior with respect to pH, showing both polyelectrolyte and polyampholyte effects. Furthermore, we have quaternized the 4-vinyl pyridine segments to form a mixed weak/strong, or annealed/quenched, polyelectrolyte system. The quaternized polymer brush exhibits different pH-responsive behavior, with decreasing film thickness being observed with increasing pH.
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