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Complex Dynamics of a Fluorinated Vinylidene Cyanide Copolymer Highlighted by Dielectric Relaxation Spectroscopy.

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Title: Complex Dynamics of a Fluorinated Vinylidene Cyanide Copolymer Highlighted by Dielectric Relaxation Spectroscopy.
Authors: Castelvetro, Valter1 valter.castelvetro@unipi.it, Capaccioli, Simone2, Raihane, Mustapha3, Atlas, Salima3
Source: Macromolecules. Jul2016, Vol. 49 Issue 14, p5104-5114. 11p.
Subjects: Copolymers, Vinylidene compounds, Dielectric relaxation, Fluorination, Cyanides, Spectrum analysis
Abstract: The complex dynamics of a nearly alternating copolymer of vinylidene cyanide (1,1-dicyanoethylene, VCN) with 2,2,2-trifluoroethyl methacrylate (TFEMA), including two α-relaxations with diverging time scale in the glass transition temperature range, was thoroughly characterized by dielectric spectroscopy over wide temperature and frequency ranges and analyzed in the frame of the Ngai's coupling model. The dielectric relaxation strength as well as the glass transition temperature, the temperature dependence of the α-relaxation time, and the corresponding distribution of relaxation times were all larger than those of a reference TFEMA homopolymer, as expected from the introduction of the stiffening VCN units all along the macromolecular chain. The effect of casting solvent and applied poling electric field on the copolymer dielectric strength suggests the onset of local orientational order involving the strong dipoles in the VCN units, a requirement for piezo- and pyroelectricity in amorphous polymers. [ABSTRACT FROM AUTHOR]
Copyright of Macromolecules is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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An: 117084660
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  Data: Complex Dynamics of a Fluorinated Vinylidene Cyanide Copolymer Highlighted by Dielectric Relaxation Spectroscopy.
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  Data: <searchLink fieldCode="AR" term="%22Castelvetro%2C+Valter%22">Castelvetro, Valter</searchLink><relatesTo>1</relatesTo><i> valter.castelvetro@unipi.it</i><br /><searchLink fieldCode="AR" term="%22Capaccioli%2C+Simone%22">Capaccioli, Simone</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Raihane%2C+Mustapha%22">Raihane, Mustapha</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Atlas%2C+Salima%22">Atlas, Salima</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Macromolecules%22">Macromolecules</searchLink>. Jul2016, Vol. 49 Issue 14, p5104-5114. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Copolymers%22">Copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Vinylidene+compounds%22">Vinylidene compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectric+relaxation%22">Dielectric relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorination%22">Fluorination</searchLink><br /><searchLink fieldCode="DE" term="%22Cyanides%22">Cyanides</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink>
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  Label: Abstract
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  Data: The complex dynamics of a nearly alternating copolymer of vinylidene cyanide (1,1-dicyanoethylene, VCN) with 2,2,2-trifluoroethyl methacrylate (TFEMA), including two α-relaxations with diverging time scale in the glass transition temperature range, was thoroughly characterized by dielectric spectroscopy over wide temperature and frequency ranges and analyzed in the frame of the Ngai's coupling model. The dielectric relaxation strength as well as the glass transition temperature, the temperature dependence of the α-relaxation time, and the corresponding distribution of relaxation times were all larger than those of a reference TFEMA homopolymer, as expected from the introduction of the stiffening VCN units all along the macromolecular chain. The effect of casting solvent and applied poling electric field on the copolymer dielectric strength suggests the onset of local orientational order involving the strong dipoles in the VCN units, a requirement for piezo- and pyroelectricity in amorphous polymers. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Macromolecules is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1021/acs.macromol.6b00683
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      – Code: eng
        Text: English
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        PageCount: 11
        StartPage: 5104
    Subjects:
      – SubjectFull: Copolymers
        Type: general
      – SubjectFull: Vinylidene compounds
        Type: general
      – SubjectFull: Dielectric relaxation
        Type: general
      – SubjectFull: Fluorination
        Type: general
      – SubjectFull: Cyanides
        Type: general
      – SubjectFull: Spectrum analysis
        Type: general
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      – TitleFull: Complex Dynamics of a Fluorinated Vinylidene Cyanide Copolymer Highlighted by Dielectric Relaxation Spectroscopy.
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            NameFull: Capaccioli, Simone
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            NameFull: Raihane, Mustapha
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            NameFull: Atlas, Salima
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            – D: 26
              M: 07
              Text: Jul2016
              Type: published
              Y: 2016
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              Value: 49
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