Hyperbranched poly(acrylic acid) grafts as substrates for synthesis of functionally elaborated surfaces
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Hyperbranched grafting with ,-diaminopoly(tert-butyl acrylate) is suitable for modification of softer, less-defined polymer surfaces. Using oxidized polyethylene as a substrate, the mild conditions of this hyperbranched chemistry affords a covalently modified polyethylene film containing significant amounts of grafted poly(acrylic acid). The polymeric reagent's size and polyethylene incompatibility ensure surface selectivity. Repetitive cycles of grafting ensure a highly functionalized product film. These surfaces are shown to be suitable for further covalent modification. Moreover, when hyperbranched grafts are modified with initiators, subsequent polymerization can occur.