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Rapid decomposition of a cationic azo-initiator under microwave irradiation

Authors

  • C. Costa,

    1. Departamento de Engenharia Química, Universidade Federal de Santa Catarina, Campus Universitário, Florianópolis 88040-900, SC, Brazil
    2. Núcleo de Estudos em Sistemas Coloidais, Instituto de Tecnologia e Pesquisa, Av. Murilo Dantas 300, Aracaju 49032-490, SE, Brazil
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  • V. H. S. Santos,

    1. Núcleo de Estudos em Sistemas Coloidais, Instituto de Tecnologia e Pesquisa, Av. Murilo Dantas 300, Aracaju 49032-490, SE, Brazil
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  • P. H. H. Araujo,

    1. Departamento de Engenharia Química, Universidade Federal de Santa Catarina, Campus Universitário, Florianópolis 88040-900, SC, Brazil
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  • C. Sayer,

    1. Departamento de Engenharia Química, Universidade Federal de Santa Catarina, Campus Universitário, Florianópolis 88040-900, SC, Brazil
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  • A. F. Santos,

    1. Núcleo de Estudos em Sistemas Coloidais, Instituto de Tecnologia e Pesquisa, Av. Murilo Dantas 300, Aracaju 49032-490, SE, Brazil
    2. Programa de Engenharia de Processos, Universidade Tiradentes, Aracaju 49032-490, SE, Brazil
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  • C. Dariva,

    1. Núcleo de Estudos em Sistemas Coloidais, Instituto de Tecnologia e Pesquisa, Av. Murilo Dantas 300, Aracaju 49032-490, SE, Brazil
    2. Programa de Engenharia de Processos, Universidade Tiradentes, Aracaju 49032-490, SE, Brazil
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  • M. Fortuny

    Corresponding author
    1. Núcleo de Estudos em Sistemas Coloidais, Instituto de Tecnologia e Pesquisa, Av. Murilo Dantas 300, Aracaju 49032-490, SE, Brazil
    2. Programa de Engenharia de Processos, Universidade Tiradentes, Aracaju 49032-490, SE, Brazil
    • Núcleo de Estudos em Sistemas Coloidais, Instituto de Tecnologia e Pesquisa, Av. Murilo Dantas 300, Aracaju 49032-490, SE, Brazil
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Abstract

Microwave-assisted decomposition of 2,2′-azobis(2-methylpropionamidine) dihydrochloride (or V50), a cationic azo-initiator, and emulsion polymerizations were performed and compared to reactions with conventional heating. Higher decomposition rate constants were found in microwave reactions. This was ascribed to the development of hot spots inside the reaction mixture, promoted by microwave irradiation. In polymerization reactions, microwave-promoted acceleration of the reactions. The effect of high power irradiation was also studied, using a pulsed method in which samples were repeatedly heated at constant power (500 or 1400 W), and cooled down by immersing in an ice bath. Rapid reactions were obtained, because a great amount of energy could be applied within short time intervals. The power level had no effect on the decomposed percentages and on the monomer conversion, and only affected the irradiation time. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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