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Covalently tethered comb-like polymer brushes on hydrogen-terminated Si (100) surface via consecutive aqueous atom transfer radical polymerization of methacrylates

Authors

  • Guangqun Zhai,

    Corresponding author
    1. Department of Materials Science and Engineering, Jiangsu Polytechic University, Changzhou 213016, People's Republic of China
    • Department of Materials Science and Engineering, Jiangsu Polytechic University, Changzhou 213016, People's Republic of China
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  • Y. Cao,

    1. Department of Materials Science and Engineering, Jiangsu Polytechic University, Changzhou 213016, People's Republic of China
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  • J. Gao

    1. Department of Materials Science and Engineering, Jiangsu Polytechic University, Changzhou 213016, People's Republic of China
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Abstract

The hydrogen-terminated Si (100) (Si[BOND]H surface) was functionalized by coupling with 4-vinylbenzyl chloride (VBC) to form a Si[BOND]VBC surface, which serves as macroinitiators for the surface-initiated aqueous atom transfer radical polymerization (ATRP) of 2-hydroxyethyl methacrylate (HEMA) and poly(ethylene glycol)methacrylate (PEGMA) to prepare Si[BOND]VBC[BOND]g[BOND]PHEMA and Si[BOND]VBC[BOND]g[BOND]PPEGMA substrates, respectively. The ellipsometric results revealed that the surface-initiated ATRP of both PHEMA and PPEGMA brushes proceeded in a controlled fashion. By adjusting the monomer concentration, an eccentric polymer thickness dependence on the initial monomer concentration [M]0 was observed for both HEMA and PEGMA, i.e., in the dilute regime, the thickness of the polymer film increases with the increase in [M]0; however, beyond critical [M]0, the thickness deceases gradually with the further increase. Such an eccentricity was tentatively correlated to the counteractive combination of the increase in [M]0 and decrease in the apparent polymerization rate constant. Both Si[BOND]VBC[BOND]g[BOND]PHEMA and Si[BOND]VBC[BOND]g[BOND]PPEGMA substrates were esterified for the subsequent surface-initiated ATRP, resulting in corresponding comb-like brushes. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2590–2599, 2006

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