Kinetics of free radical polymerization probed by dielectric relaxation spectroscopy under high conductivity conditions

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Abstract

Polymerization kinetics of tri-ethylene glycol dimethacrylate (TrEGDMA)/2,2-azobis-isobutyronitrile (AIBN) mixtures (0.1% w.t.) at different temperatures was investigated by using dielectric relaxation spectroscopy. The dielectric spectra at the polymerization temperatures studied are dominated by high conductivity leading us to employ the electric modulus representation in order to extract information about the evolution of the system during isothermal reaction. An intense peak appears in the imaginary component of the complex dielectric modulus which is related to conductivity. The variation of the strength of this peak and of its relaxation time with the polymerization time allows us to determine the polymerization degree evolution and the moment in which vitrification is attained, which can be compared with results obtained by temperature modulated DSC in a previous work (Viciosa MT, Hoyo JQ Dionisio M, Gomez Ribelles JL Journal of Thermal Analysis and Calorimetry 2007; 90:407-414). The study was completed with a detailed analysis of conductivity carried out in the unreacted system using both dielectric modulus and conductivity representations. (C) 2011 Elsevier Ltd. All rights reserved.
Original languageUnknown
Pages (from-to)1944-1953
JournalPolymer
Volume52
Issue number9
DOIs
Publication statusPublished - 1 Jan 2011

Keywords

    Cite this

    @article{a5cc7fa9c8314cf4b7d5c0625b84e97a,
    title = "Kinetics of free radical polymerization probed by dielectric relaxation spectroscopy under high conductivity conditions",
    abstract = "Polymerization kinetics of tri-ethylene glycol dimethacrylate (TrEGDMA)/2,2-azobis-isobutyronitrile (AIBN) mixtures (0.1{\%} w.t.) at different temperatures was investigated by using dielectric relaxation spectroscopy. The dielectric spectra at the polymerization temperatures studied are dominated by high conductivity leading us to employ the electric modulus representation in order to extract information about the evolution of the system during isothermal reaction. An intense peak appears in the imaginary component of the complex dielectric modulus which is related to conductivity. The variation of the strength of this peak and of its relaxation time with the polymerization time allows us to determine the polymerization degree evolution and the moment in which vitrification is attained, which can be compared with results obtained by temperature modulated DSC in a previous work (Viciosa MT, Hoyo JQ Dionisio M, Gomez Ribelles JL Journal of Thermal Analysis and Calorimetry 2007; 90:407-414). The study was completed with a detailed analysis of conductivity carried out in the unreacted system using both dielectric modulus and conductivity representations. (C) 2011 Elsevier Ltd. All rights reserved.",
    keywords = "Free radical polymerization, Electric modulus, TrEGDMA",
    author = "Andrade, {Maria Madalena Alves Campos de Sousa Dion{\'i}sio}",
    year = "2011",
    month = "1",
    day = "1",
    doi = "10.1016/j.polymer.2011.03.006",
    language = "Unknown",
    volume = "52",
    pages = "1944--1953",
    journal = "Polymer",
    issn = "0032-3861",
    publisher = "Elsevier",
    number = "9",

    }

    TY - JOUR

    T1 - Kinetics of free radical polymerization probed by dielectric relaxation spectroscopy under high conductivity conditions

    AU - Andrade, Maria Madalena Alves Campos de Sousa Dionísio

    PY - 2011/1/1

    Y1 - 2011/1/1

    N2 - Polymerization kinetics of tri-ethylene glycol dimethacrylate (TrEGDMA)/2,2-azobis-isobutyronitrile (AIBN) mixtures (0.1% w.t.) at different temperatures was investigated by using dielectric relaxation spectroscopy. The dielectric spectra at the polymerization temperatures studied are dominated by high conductivity leading us to employ the electric modulus representation in order to extract information about the evolution of the system during isothermal reaction. An intense peak appears in the imaginary component of the complex dielectric modulus which is related to conductivity. The variation of the strength of this peak and of its relaxation time with the polymerization time allows us to determine the polymerization degree evolution and the moment in which vitrification is attained, which can be compared with results obtained by temperature modulated DSC in a previous work (Viciosa MT, Hoyo JQ Dionisio M, Gomez Ribelles JL Journal of Thermal Analysis and Calorimetry 2007; 90:407-414). The study was completed with a detailed analysis of conductivity carried out in the unreacted system using both dielectric modulus and conductivity representations. (C) 2011 Elsevier Ltd. All rights reserved.

    AB - Polymerization kinetics of tri-ethylene glycol dimethacrylate (TrEGDMA)/2,2-azobis-isobutyronitrile (AIBN) mixtures (0.1% w.t.) at different temperatures was investigated by using dielectric relaxation spectroscopy. The dielectric spectra at the polymerization temperatures studied are dominated by high conductivity leading us to employ the electric modulus representation in order to extract information about the evolution of the system during isothermal reaction. An intense peak appears in the imaginary component of the complex dielectric modulus which is related to conductivity. The variation of the strength of this peak and of its relaxation time with the polymerization time allows us to determine the polymerization degree evolution and the moment in which vitrification is attained, which can be compared with results obtained by temperature modulated DSC in a previous work (Viciosa MT, Hoyo JQ Dionisio M, Gomez Ribelles JL Journal of Thermal Analysis and Calorimetry 2007; 90:407-414). The study was completed with a detailed analysis of conductivity carried out in the unreacted system using both dielectric modulus and conductivity representations. (C) 2011 Elsevier Ltd. All rights reserved.

    KW - Free radical polymerization

    KW - Electric modulus

    KW - TrEGDMA

    U2 - 10.1016/j.polymer.2011.03.006

    DO - 10.1016/j.polymer.2011.03.006

    M3 - Article

    VL - 52

    SP - 1944

    EP - 1953

    JO - Polymer

    JF - Polymer

    SN - 0032-3861

    IS - 9

    ER -