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Copolymerization of α-cyanovinyl acetate with acrylonitrile and methacrylonitrile: Synthesis, characterization, and study of their dielectric behavior

Authors

  • Mourad Arous,

    1. Laboratoire des Matériaux Composites, Céramiques et Polymères, Faculté des Sciences de Sfax, Route de Skoura, Sfax 3018, Tunisia
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  • Ali Kallel,

    1. Laboratoire des Matériaux Composites, Céramiques et Polymères, Faculté des Sciences de Sfax, Route de Skoura, Sfax 3018, Tunisia
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  • Hamid Kaddami,

    1. Laboratoire de Chimie Bioorganique et Macromolécualire, Faculté des Sciences et Techniques, Avenue Abdelkrim Khattabi, BP 549, Marrakech 40000, Morocco
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  • Mohamed Lahcini,

    1. Laboratoire de Chimie Bioorganique et Macromolécualire, Faculté des Sciences et Techniques, Avenue Abdelkrim Khattabi, BP 549, Marrakech 40000, Morocco
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  • Ahmed Belfkira,

    1. Laboratoire de Chimie Bioorganique et Macromolécualire, Faculté des Sciences et Techniques, Avenue Abdelkrim Khattabi, BP 549, Marrakech 40000, Morocco
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  • Mustapha Raihane

    Corresponding author
    1. Laboratoire de Chimie Bioorganique et Macromolécualire, Faculté des Sciences et Techniques, Avenue Abdelkrim Khattabi, BP 549, Marrakech 40000, Morocco
    • Laboratoire de Chimie Bioorganique et Macromolécualire, Faculté des Sciences et Techniques, Avenue Abdelkrim Khattabi, BP 549, Marrakech 40000, Morocco
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Abstract

In the frame of a research aiming at developing new dielectric polymers containing C[BOND]CN substituent with strong dipole moment, the radical copolymerization of cyano (nitrile) monomers and an α-cyanovinyl acetate (CVA) as the comonomer, initiated by AIBN is described. Methacrylonitrile (MAN) and acrylonitrile (AN) were chosen as the cyano monomers. The homopolymer of CVA was also prepared and the corresponding yield was close to 60%. All these polymers were characterized by 13C NMR, IR, DSC, and TGA. The percentages of incorporation of AN and MAN in the copolymers were 36 and 56%, respectively. These products showed high glass transition temperatures, Tg, ranging between 124 and 142°C. The thermogravimetry analyses showed that these copolymers are stable up to 200°C. Dielectric spectroscopy analysis revealed a weak relaxation β process below Tg. The α relaxation phenomena have also been characterized around the Tg and associated to the cooperative movements of the polar groups (CN). The values of dielectric relaxation increment were calculated at 150°C using the Havriliak–Negami equation and indicated that these polymers exhibit interesting dielectric properties comparatively to similar cyano materials. The α-activation energies were also calculated. New statistic copolymers based on CVA were characterized. The values of the intensity of α relaxation show the potential application of such materials in the domain of electronics. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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