Synthesis of nanophase-separated poly(urethane-co-acrylic acid) network films and their application for magnetic nanoparticle synthesis

초록

Poly(urethane-co-acrylic acid) films were synthesized by the copolymerization of urethane acrylate nonionomer (UAN) and acrylic acid (AA) under different conditions. Poly(urethane-co-acrylic acid) films exhibited very different mechanical properties, attributed to the microstructural difference with the type of solvents used in the film preparation. The film synthesized using UAN/AA/water mixture had a relatively highly nanophase separated structure compared to that of the other films prepared using UAN/AA/dioxane mixture, resulting in higher mechanical property and glass-transition temperature. The nanostructural differences could be also confirmed by atomic force microscopy measurements. Magnetic nanocomposite films synthesized based on UAN/AA/water and UAN/AA/dioxane mixtures showed different sizes of magnetic nanoparticles, attributed to the differences of size of hydrophilic nanodomains. The higher the degree of nanophase separation within poly(urethane-co-acrylic acid) films, the larger the size of hydrophilic nanodomains, resulting in formation of larger nanoparticles. (C) 2004 Wiley Periodicals, Inc.

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