Thermally Stimulated Discharge of Polymer Electrets

Turnhout, J. van

doi:10.1295/polymj.2.173

Cited by 516 publications

(256 citation statements)

References 34 publications

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“…Polarization values present a similar trend as d 33 constant measurements and are in good agreement with the values predicted by the theoretical model. The activation energy was calculated based on [13] and the Bucci method [12] in figure 9 Bucci graph is represented showing current as a function of the inverse of the temperature 1/T and the curve of relaxation time as a function of 1/T also. The slope of the straight line is Ea/k and the independent term is ln(τ 0 ).…”

Section: Tsdc Measuring Resultsmentioning

confidence: 99%

Characterisation and optimisation of the d ₃₃ coefficient of cellular PP films

Braña

Llovera-Segovia²,

Mor³

et al. 2017

IET Science, Measurement & Technology

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Piezoelectric polymer cellular films with silver electrodes are made from a PP film activated by corona discharge. This cellular polymer is characterized by its high piezoelectric d33 coefficients in comparison with piezoelectric ceramics and other polymers like PVDF. One of the advantages is their malleability and shape ability in different kinds of forms. Our work presents the optimization of the activation process and the results of films characterization. All the samples are made from available PP film modified by a thermal biaxial stretching. d33 constant was measured by a quasi-static method and laser interferometry giving similar results. Transducer coefficients of about 700 pC/N were obtained. An approximation of the surface charge density in the polymer voids was obtained with a mathematical model. Thermal stability was checked by thermally stimulated depolarization currents (TSDC) showing a relationship between TSDC and d33 constant. Time stability was determined with more than one year old samples. Finally, the resonance frequency was obtained from interferometry measurement.

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Section: Tsdc Measuring Resultsmentioning

confidence: 99%

Characterisation and optimisation of the d ₃₃ coefficient of cellular PP films

Braña

Llovera-Segovia²,

Mor³

et al. 2017

IET Science, Measurement & Technology

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“…Natural frequency is a function of molecular shape and size. [4] For guesthost polymer systems, the chromophores are all of similar shape and size, so the natural frequency should be a constant. Howctei, the I S C~ iidecular cnvikanizent can vary greatly, depending on where the chromophore molecule is located with relationship to host molecule segments, the compactness of the host molecules, and the chromophore loading density.…”

Section: A Descriptionmentioning

confidence: 99%

“…[4] The most general waveguide case is the asymmetric waveguide: a polar layer sandwiched by 2 different nonpolar layers. Equations for the charge density and polarization can be derived beginning with the current density for a 3 layer stack.…”

Section: B Poling and Cool Down Equationrmentioning

confidence: 99%

“…[5,6] Studies based on dielectric constant measurements have also been conducted. [7] These polymer films have been studied by a variety of methods including Thermally Stimulated Discharge (TSD) [4], Second Harmonic Generation (SHG), pyroelectric currents, [8] and thermal and acoustic waves. [9,10] Work has been reported on single layer guesthost systems [ 1 11 and for single layer polyamide film irradiation influence studies [ 121 using TSD for experimental analysis.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of optical waveguide poling and thermally stimulated discharge (TSD) charge and current densities for guest/host electro-optic polymers

Watson

Ashley

Abushagur

2004

IEEE J. Quantum Electron.

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Absfracf-A charge density and current density model of a waveguide system has been developed to explore the ef€ects of electric field electrode poling. An optical waveguide may be modeled during poling by considering the dielectric charge distribution, polarization charge distribution, and conduetion charge generated by the poling field. These charge distributions are the source of poling current densities. The model shows that boundary charge current density and polarization current density are the major source of currents measured during poling and thermally stimulated discharge These charge distributions provide insight into the poling mechanisms and are directly related to E , , and, g.Initial comparisons with expvimntpl data show excellent correlation to the model results.

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“…These monomers give rise to polymers with very different glass transition temperatures (13,14) and so it is possible to study the pyrene emission behavior at high conversion in very different microhydrodynamic re gimes.…”

Section: Introductionmentioning

confidence: 99%

Studies of polymerization of acrylic monomers using luminescence probes and differential scanning calorimetry

Serrano

Levenfeld

Bravo

et al. 1996

Polymer Engineering & Sci

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A fiber optic system has been designed to couple calorimeter and fluorimeter equipment for in situ monitoring of polymerization reactions by both techniques simultaneously. Two acrylic monomers (cyclohexyl methacrylate, CHM, and 2-ethylhexyl acrylate, EHA) were studied at different temperatures. Pyrene (Py) was employed at a low concentration (:Sl0-4 mol/L) as a fluorescence probe. The emission spectrum of pyrene shows a broad band peaking at 390 nm, whose intensity grows with polymerization progress. A correlation with conversion degree could be established by collecting fluorescence intensity through the optical fiber at different polymerization times. For the more flexible polymer formed, poly(ethylhexyl acrylate) (PEHA), Py emission sharply increases only when high conversions are reached and continues increasing for a long time after the limiting conversion is attained. For CHM polymerizations, S-shaped curves are found. Isochronal plots of intensity vs. scaled conversion allow elaboration of master curves for the peak emissl. on. Data at 50°C for CHM cannot be fitted to the master curve, and this is explained in terms of vitrification.

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Thermally Stimulated Discharge of Polymer Electrets

Cited by 516 publications

References 34 publications

Characterisation and optimisation of the d ₃₃ coefficient of cellular PP films

Characterisation and optimisation of the d ₃₃ coefficient of cellular PP films

Modeling of optical waveguide poling and thermally stimulated discharge (TSD) charge and current densities for guest/host electro-optic polymers

Studies of polymerization of acrylic monomers using luminescence probes and differential scanning calorimetry

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Thermally Stimulated Discharge of Polymer Electrets

Cited by 516 publications

References 34 publications

Characterisation and optimisation of the d 33 coefficient of cellular PP films

Characterisation and optimisation of the d 33 coefficient of cellular PP films

Modeling of optical waveguide poling and thermally stimulated discharge (TSD) charge and current densities for guest/host electro-optic polymers

Studies of polymerization of acrylic monomers using luminescence probes and differential scanning calorimetry

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Characterisation and optimisation of the d ₃₃ coefficient of cellular PP films

Characterisation and optimisation of the d ₃₃ coefficient of cellular PP films