Electrical and dielectric behavior in blends of polyurethane-based ionomers

Tsonos, Christos; Apekis, L.; Viras, Kyriakos; Stepanenko, L.V.; Karabanova, L. V.; Sergeeva, L. M.

doi:10.1016/s0167-2738(01)00858-x

Cited by 43 publications

(13 citation statements)

References 17 publications

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“…This unusual behavior could be explained if differences in the morphology of the SIBS 68–9% sample somehow affected the contact between the polymer and the electrodes in the MIM capacitor. It could be that, once the electric field is applied, charged particles accumulate in the interfacial region and additional polarization, not necessarily corresponding to the polymer, is observed . Similarly, this effect was also observed for samples of SIBS 91–9% in the same frequency range and the results are presented in Figure (c).…”

Section: Resultssupporting

confidence: 65%

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Rozo‐Medina

Padovani

2017

J of Applied Polymer Sci

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Sulfonated, block copolymers have traditionally been studied for applications in fuel cells and chemical protective clothing, among others. As such, most investigations have focused on the evaluation of transport properties and the selectivity and permeability of the polymer membranes. This work, however, focuses on the electrical characterization of sulfonated poly(styreneisobutylene-styrene) (SIBS) triblock copolymer thin films. More specifically, the dielectric properties of SIBS are evaluated as a function of critical parameters such as frequency, sulfonation percent, and the polymer concentration. The results show that the dielectric constant increases with sulfonation percent and polymer concentration to values as high as 13,600. This work also provides insights into the correlation of SIBS electrical properties with its chemical structure and morphology. The structure-property relationship is derived through a combination of techniques including: elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and atomic force microscopy.

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Section: Resultssupporting

confidence: 65%

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Rozo‐Medina

Padovani

2017

J of Applied Polymer Sci

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“…But at high frequencies dielectric constant value decreases due to shorter time available for dipoles to align and polarization effects [29]. The Cole-Cole plot shows a compressed semi curvature in high frequency range and an inclined straight line in low frequency range, which is different from iodine chloride non-blocking electrode [30]. In our experiment only one semi curvature is observed, which indicates that there is no electrode reaction at electrode interfaces.…”

Section: Resultsmentioning

confidence: 59%

Spectroscopic and dielectric study of iodine chloride doped PVA/PVP blend

Abdelrazek

Ragab

2014

Indian J Phys

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Optical and dielectric properties of Poly (vinyl alcohol)/ Poly (vinyl pyrrolidone) blend and blend loaded with different concentrations of ICl 2 were studied. UV-Vis spectral analysis before and after c-irradiation suggested that the addition of iodine led to complete complexation between ICl 2 and polymer blend were observed. The values of optical parameters k o , S o and n ? were determined from by reflection and transmission spectra in the range of 200-800 nm. The refractive index was found to change non-monotonically with the increase of iodine. Infrared analysis revealed the formation of new species between blend and iodine content. There were some changes in IR absorption bands, position and their intensities. The AC conductivity (r ac ) behavior of all prepared films was investigated in the frequency range 42 Hz-5 MHz and under different isothermal stabilization in the temperature range 300-400 K. The dependence of the imaginary modulus (M 00 ) on frequency at lower frequencies was estimated. The increasing values of M 00 may be attributed to the bulk effect with the increase in temperature.

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“…At high frequencies, the periodic reversal of the electric field occurs so fast that there is no excess ion diffusion in the direction of the field. The polarization due to the charge accumulation decreases, leading to a decrease in the values of ε′ and ε″ 47, 48…”

Section: Dielectric Studymentioning

confidence: 99%

Biodegradable blends based on polyvinyl pyrrolidone for insulation purposes

El-Houssiny

Ward

Mansour

et al. 2011

J of Applied Polymer Sci

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Polyvinyl pyrrolidone/polyvinyl alcohol (PVP/PVA) and polyvinyl pyrrolidone/starch (PVP/St) blends were prepared with different compositions. The compatibility studies indicate that PVP/PVA is compatible while PVP/St is incompatible. The addition of glycerol and glutaraldehyde can improve to some extent the phase separation behavior between PVP and St. The permittivity e 0 and the dielectric loss e 00 were measured in the frequency range 0.01 Hz up to 10 MHz and temperatures from 30 up to 90 C. It is found that the blend ratio (50/50) of both investigated systems is preferable for insulation purposes in comparable with the other blends under investigation. The data of the loss electric modulus M 00 was calculated from the dielectric parameters e 0 and e 00 and analyzed into three relaxation mechanisms ascribing the cooperative motion of the main and side chains s 1 (ab), the side chain motion s 2 (b) and the segmental motion of the groups attached to the side chains s 3 (bc). The activation energy corresponds to the second relaxation process DH 2 was calculated using Arrhenius equation and found to be in the range which justifies the presumption of b-relaxation process.

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Electrical and dielectric behavior in blends of polyurethane-based ionomers

Cited by 43 publications

References 17 publications

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Spectroscopic and dielectric study of iodine chloride doped PVA/PVP blend

Biodegradable blends based on polyvinyl pyrrolidone for insulation purposes

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