Navegando por Palavras-chave "Responsive Polymer"

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    Síntese De Nanopartículas Poliméricas Com Estímulo Resposta Ao Ph Obtidas Via Polimerização Em Emulsão Para Produção De Carpete Reciclável
    (Universidade Federal de São Paulo (UNIFESP), 2017-08-30) Cobianchi, Andreia Ferreira [UNIFESP]; Oliveira, Mauricio Pinheiro De [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Automotive and industrial carpets are produced by impregnating polyethylene terephthalate (PET) fibers with aqueous dispersion copolymers in order to fix the fibers, provide dimensional stability and abrasion resistance. Currently, approximately 35% of the national carpet production is composed of chips and leftovers from the manufacturing process, which are incinerated or disposed of in landfills because it is impossible to remove the polymers used in the impregnation of the carpet fibers. The objective of this work is to develop polymeric nanoparticles with stimulus pH response to produce industrial carpets, aiming at the recycling of polymer fibers and nanoparticles for the production of new materials. Polymeric nanoparticles were obtained by emulsion copolymerization of styrene (STy), n-butyl acrylate (Abu) and acrylonitrile (ACN) in the absence of emulsifier. As a polymerization stabilizer, a copolymer of poly (methacrylic acid-co-methacrylamide) obtained via copolymerization of methacrylic acid (AMA) with methacrylamide (MA) was used. The copolymers obtained were characterized in relation to the overall conversion, average particle diameter, zeta potential, viscosity, molar mass, molar mass distribution (MWD) and reemulsification of the polymer film at different values of pH. The industrial carpets were produced by total impregnation and evaluated in relation to reemulsification of the polymer film under different pH values. Stabilizers of poly (methacrylic acid-comethacrylamide) with molecular weigh less than 10,000 g/mol showed the most promising results to produce the nanoparticles with response stimulus and mean diameter 80 nm in the absence of emulsifier, allowing the re-emulsification of the polymeric film when in contact with alkaline solution.