scholarly journals Effects of ions on the dielectric permittivity and relaxation rate and the decoupling of ionic diffusion from dielectric relaxation in supercooled liquid and glassy 1-propanol

2002 ◽  
Vol 116 (10) ◽  
pp. 4192-4201 ◽  
Author(s):  
G. Power ◽  
G. P. Johari ◽  
J. K. Vij
Keyword(s):  
Dielectric Permittivity ◽  
Dielectric Relaxation ◽  
Relaxation Rate ◽  
Supercooled Liquid ◽  
Ionic Diffusion

Compact Representation and Statistical Significance of Measurement Data Reflecting Electric Properties of Polymer Nanocomposites

2013 ◽  
Vol 559 ◽  
pp. 87-92
Author(s):  
Imants Matīss ◽  
Ēvalds Pentjušs ◽  
Oskars Krievs ◽  
Rita Berzina
Keyword(s):  
Dielectric Permittivity ◽  
Mathematical Models ◽  
Dielectric Relaxation ◽  
Polymer Nanocomposites ◽  
Statistical Significance ◽  
Measurement Data ◽  
Electric Properties ◽  
Compact Representation ◽  
Relaxation Model ◽  
Frequency Curves

The paper is devoted to investigation of frequency-dependent electric properties of polymer nanocomposites. The experimentally acquired frequency characteristics of complex dielectric permittivity are substituted by equivalent mathematical models of dielectric relaxation. It is shown that such substitution is valid, provided that the selected relaxation model allows shaping the synthesized frequency curves in a sufficient range and the statistical significance of the measurement data is within a satisfactory range.

scholarly journals Dielectric Relaxation Behavior of Silver Nanoparticles and Graphene Oxide Embedded Poly(vinyl alcohol) Nanocomposite Film: An Effect of Ionic Liquid and Temperature

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 374 ◽  
Author(s):  
Ganeswar Sahu ◽  
Mamata Das ◽  
Mithilesh Yadav ◽  
Bibhu Prasad Sahoo ◽  
Jasaswini Tripathy
Keyword(s):  
Electron Microscopy ◽  
Ionic Liquid ◽  
Graphene Oxide ◽  
Dielectric Permittivity ◽  
Dielectric Relaxation ◽  
Ag Nanoparticles ◽  
Vinyl Alcohol ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol ◽  
Dielectric Relaxation Behavior

This paper presents the dielectric characteristics of nanocomposite films of poly(vinyl alcohol) (PVA) embedded with silver (Ag) nanoparticles and graphene oxide(GO). The nanocomposite films were fabricated by using the solvent casting approach. The morphological analysis was carried out through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The dielectric relaxation behavior of nanocomposite films was analyzed in the frequency range of 101 to 106 Hz, by varying GO loading. The temperature effect was investigated over the temperature range of 40 to 150 °C. The effect of ionic liquid (IL) was also explored by comparing the dielectric behavior of films fabricated without using ionic liquid. The conductive filler loading variation showed a significant effect on dielectric permittivity(ε′), complex impedance (Z*) and electric conductivity (σac). The obtained results revealed that the dielectric permittivity (ε′) increased by incorporating Ag nanoparticles and increasing GO loading in PVA matrix. An incremental trend in dielectric permittivity was observed on increasing the temperature, which is attributed to tunneling and hopping mechanism. With an increase in nanofiller loading, the real part of impedance (Z′) and imaginary part of impedance (Z″) were found to decrease. Further, the semicircular nature of Nyquist plot indicated the decrease in bulk resistivity on increasing GO loading, temperature and incorporating ionic liquid. On the basis of above findings, the obtained GO-Ag-PVA nanocomposite films can find promising applications in charge storage devices.

scholarly journals Synthesis of polar polynorbornenes with high dielectric relaxation strength as candidate materials for dielectric applications

2022 ◽  
Author(s):  
Francis Owusu ◽  
Martin Tress ◽  
Frank A. Nüesch ◽  
Sandro Lehner ◽  
Dorina M. Opris
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Dielectric Permittivity ◽  
Dielectric Relaxation ◽  
Ring Opening ◽  
High Glass Transition Temperature ◽  
Relaxation Strength ◽  
Metathesis Polymerization ◽  
High Dielectric

Polar polynorbornenes prepared by ring-opening metathesis polymerization show thermally switchable dielectric permittivity. The polymers exhibit a large dielectric relaxation strength and high glass transition temperature.

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