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Semicontinuous microemulsion copolymerization of vinyl acetate and butyl acrylate: high solid content and effect of monomer addition rate

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Abstract

Vinyl acetate and butyl acrylate were copolymerized in microemulsion under monomer-starved conditions by a semicontinuous process using different monomer addition rates (R a). A mixture of sodium dodecyl sulfate and polyethylene glycol dodecyl ether (Brij®35) were used as surfactants. Potassium persulfate was the initiator. High copolymer content latexes (around 40 wt.%), average particle diameters (D p) < 50 nm and polymer-to-surfactant ratios (12 to 14, weight/weight) were obtained with weight average molar masses (M w) between 180,000 and 760,000. D p and M w of the copolymers decrease as R a is decreased. As R a increases, a shoulder in the molar mass distribution was observed at high values of M w, which was ascribed to chain transfer to polymer. Homogeneous copolymer compositions were observed throughout the reaction, which cannot be obtained by the usual batch process.

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Acknowledgments

This work was supported by the Consejo Nacional de Ciencia y Tecnología, México (grants # SEP-2003-C02-44811/A-1 and CB-61345).

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Authors and Affiliations

  1. Departamento de Ingeniería Química, Coordinación Académica Región Altiplano (COARA) Universidad Autónoma de San Luis Potosí, Carretera a Cedral KM 5+600, San José de las Trojes, Matehuala, San Luis Potosí, 78700, México

    Víctor M. Ovando-Medina

  2. Centro de Investigación en Química Aplicada (CIQA), Blvd. Enrique Reyna Hermosillo # 140, Saltillo, Coahuila, 25253, México

    René D. Peralta

  3. Centro Universitario de Ciencias Exactas e Ingeniería, Departamento de Química, Universidad de Guadalajara, Blv. M. García Barragán #1451, Guadalajara, Jalisco, 44430, México

    Eduardo Mendizábal

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  1. Víctor M. Ovando-Medina
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  2. René D. Peralta
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  3. Eduardo Mendizábal
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Correspondence to Eduardo Mendizábal .

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Ovando-Medina, V.M., Peralta, R.D. & Mendizábal , E. Semicontinuous microemulsion copolymerization of vinyl acetate and butyl acrylate: high solid content and effect of monomer addition rate. Colloid Polym Sci 287, 561–568 (2009). https://doi.org/10.1007/s00396-009-2003-6

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  • DOI: https://doi.org/10.1007/s00396-009-2003-6

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