Hyperbranched poly(acrylic acid) grafts on polyethylene; Substrates for synthesis of functionally elaborate surfaces
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Polyacrylic acid (PAA) films on polyethylene surface were modified using hyperbranched grafting. The polymer reagent's size and polyethylene incompatibility insured surface selectivity and repetitive cycles of grafting insured a higher functionalized product film. The PAA grafts on polyethylene were more completely amidated as compared to those of gold, under the same conditions. These amidated surfaces allowed self-assembly of anionic polyelectrolytes. Moreover, the produced polyelectrolyte grafts on polyethylene were effective interfaces for subsequent hydrogen bound assemblies of polyacrylamides and PAA onto the polyethylene films. When hyperbranched grafts were modified further and initiators were present, subsequent polymerization occurred.