Exploring the relationship of dielectric relaxation behavior and discharge efficiency of P(VDF-HFP)/PMMA blends by dielectric spectroscopy. (29th July 2016)

• Record Type: Journal Article
• Authors: Zhao, Xiaojia; Liu, Wenpei; Jiang, Xubo; Liu, Ke; Peng, Guirong; Zhan, Zaiji
• Is Part Of: Materials research express. Volume 3:Number 7(2016)
• Publication Date: 2016-07-29
• Subjects: P(VDF-HFP) -- PMMA -- dielectric relaxation -- discharge efficiency; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/3/7/075304
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: The dielectric relaxations in P(VDF-HFP)/PMMA blends were investigated by dielectric relaxation spectroscopy. Various dielectric relaxation and their molecular mechanisms of P(VDF-HFP), PMMA, and P(VDF-HFP)/PMMA composite films were analyzed. According to the fitted data of the Havriliak–Negami (HN) function, all relaxation processes belong to non-debye relaxation, the activation energy ( E a ), relaxation time ( τ HN ) and dielectric relaxation strength (Δ ϵ ) of P(VDF-HFP)/PMMA blends significantly decreased around and below room temperature with increasing PMMA content. But, the results of α c relaxation are opposite. In addition, the conductivities ( σ ) of P(VDF-HFP)/PMMA composite films also sharply decreased with the addition of PMMA. Thus, the high discharge energy density and efficiency of dielectric materials closely related with the lower E a, τ HN, Δ ϵ and σ .