Novel Copolymers of Difluoro Ring-substituted 2-Phenyl-1,1-dicyanoethylenes with 4-Fluorostyrene: Synthesis, Structure and Dielectric Study

Atlas, Salima; Raihane, Mustapha; Kharas, Gregory B.; Hendrickson, Peter G.; Kaddami, Hamid; Arous, M.; Kallel, A.

doi:10.1080/10601325.2012.728453

Cited by 4 publications

(2 citation statements)

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“…7-16, . The microstructure of such polymers has been investigated in relation to their nonlinear dielectric behaviour [15][16][17] and their dielectric strength, ∆ε, above T g which was found in some cases to be extraordinarily large, leading to significant piezo-and pyroelectricity.…”

Section: Introductionmentioning

confidence: 99%

“…Among the amorphous polymers investigated for their piezoelectric behavior, cyano (nitrile) containing polymers play a particularly important role. Since the discovery of the piezoelectric activity of the alternating copolymer of vinylidene cyanide (1,1-dicyanoethylene, VCN) with vinyl acetate, , there has been growing interest in the synthesis and characterization of homo- and copolymers of nitrile monomers with various vinyl comonomers such as vinyl esters, styrene, acrylic and methacrylic esters as well as their functional derivatives. − The microstructure of such polymers has been investigated in relation to their nonlinear dielectric behavior − and their dielectric strength, Δε, above T g which was found in some cases to be extraordinarily large, leading to significant piezo- and pyroelectricity.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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The complex dynamics of a nearly alternating copolymer of vinylidene cyanide (1,1-dicyanoethylene, VCN) with 2,2,2-trifluoroethyl methacrylate (TFEMA), including two alpha-relaxations with diverging time scale in the glass transition temperature range, was thoroughly characterized by dielectric\ud 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\ud 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 polymer

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Section: Introductionmentioning

confidence: 99%