Corona Charging and Thermal Sampling of Stretched Poly(vinyl Chloride)

Fahmy, T.

doi:10.1080/00914030390246045

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…Enthalpy-entropy compensation (EEC), indicating to any increase in enthalpy during non-covalent bonding of two molecules is often largely canceled out by a simultaneous decrease in entropy [41]. Similar behavior of enthalpyentropy compensation (EEC) behavior has been published elsewhere in various fields [42][43][44][45]. The narrow range of Gibbs free energy (ΔG) and the interdependence of enthalpy (ΔH) and entropy (ΔS) in the same system strongly indicate the effect of a kinetic compensation effect [46].…”

Section: Substitution Of Equation (3) Into Equation (2)supporting

confidence: 53%

TSDC of Irradiated and Non-Irradiated Cellulose Acetate

et al. 2021

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Films of cellulose acetate (CA) have been prepared by casting method using tetrahydrofuran (THF). CA films are γ-irradiated with varying radiation doses of 10, 20, 30, 40, 50 and 60 kGy using cobalt-60 ( 60 Co) source. Global thermally stimulated depolarization current (TSDC) of non-irradiated and irradiated CA samples has been investigated under the effect of various poling electric field (Ep) in a temperature range from 300 K to 440 K. It is observed that, global TSDC spectra of non-irradiated and irradiated CA samples are characterized by two relaxation peaks. One in the low temperature range ~321 K and the other in the high temperature range ~ 376-383 K are observed for non-irradiated sample. On the other hand, these temperatures are shifted towards lower temperature for irradiated samples to be located at 317 K and ~371 K. These relaxations are assigned as  and -relaxation and attributed to molecular motion of the polar acetate groups, C2H3O2 and polarization of the space charges, respectively. TStechnique has been carried out to decompose global TSDC spectra of all samples into its elementary peaks and the molecular parameters such as, activation energy and pre-exponential factor are calculated for each TS peak. Relaxation map (RM) of all samples has been analyzed using Eyring transformation and thermodynamic parameters such as, enthalpy activation (H), entropy activation (S) and Gibbs free energy (G) are estimated. The compensation phenomenon was verified by the linear relationship between both enthalpy and entropy.

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Section: Substitution Of Equation (3) Into Equation (2)supporting

confidence: 53%

TSDC of Irradiated and Non-Irradiated Cellulose Acetate

et al. 2021

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“…DOD values can be used to reflect the degree of compatibility between different phases of copolymers, polymer composites and polymer blends [44]. The compensation behaviour can be interpreted in the light of activation enthalpy-entropy relation, where the change in enthalpy of activation is compensated by the change in entropy of activation.…”

Section: Ts-rmamentioning

confidence: 99%

Rate Theory and Relaxation Map Analysis of Iodine-Doped Poly(Ethyl Methacrylate) composite films using Thermally Stimulated Depolarization Current-Thermal Sampling (TSDC-TS) Technique

Elsharkawy

2021

Egypt. J. Chem.

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Iodine-doped Poly (Ethyl Methacrylate) composites have been prepared using casting method. Global TSDC of the composite samples has been investigated using TSDC-TS technique. It is found that, global TSDC spectra of pure PEMA are characterized by two relaxations. The first relaxation which is observed as a shoulder in the temperature range 324-333 K is attributed to the motion of side group and named -relaxation. Whereas, the second relaxation is observed in the glass temperature range of PEMA at Tm= 347 K and named as dipolar relaxation, i.e., -relaxation. On doping with iodine, a new relaxation peak has been obtained at high temperatures ~ 397-409 K, and named as space charge relaxation, i.e., -relaxation. Complex TSDC spectra of PEMA-Iodine composites have been resolved into its elementary peaks using TS technique. These elementary peaks have been used to construct relaxation map (RM) of all samples using Eyring transformation. The existence of compensation phenomenon for all samples is also verified and the coordinates of each compensation point have been estimated. These coordinates are used to calculate the density of disorder (DOD) and thermal expansion coefficient of the samples. The thermodynamic parameters of the samples, such as, enthalpy, entropy and Gibbs free energy have been calculated at different poling temperatures.

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Investigation of Iodine-Doped Poly(Ethyl Methacrylate) Relaxation by TSDC Technique in the Vicinity of the Glass Transition Temperature

Fahmy

2007

International Journal of Polymeric Materials and Polymeric Biom

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Corona Charging and Thermal Sampling of Stretched Poly(vinyl Chloride)

Cited by 3 publications

References 23 publications

TSDC of Irradiated and Non-Irradiated Cellulose Acetate

TSDC of Irradiated and Non-Irradiated Cellulose Acetate

Rate Theory and Relaxation Map Analysis of Iodine-Doped Poly(Ethyl Methacrylate) composite films using Thermally Stimulated Depolarization Current-Thermal Sampling (TSDC-TS) Technique

Investigation of Iodine-Doped Poly(Ethyl Methacrylate) Relaxation by TSDC Technique in the Vicinity of the Glass Transition Temperature

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