Rate Theory and Relaxation Map Analysis of Iodine-Doped Poly(Ethyl Methacrylate) composite films using Thermally Stimulated Depolarization Current-Thermal Sampling (TSDC-TS) Technique
- 31 May 2021
- journal article
- research article
- Published by Egypts Presidential Specialized Council for Education and Scientific Research in Egyptian Journal of Chemistry
- Vol. 64 (10), 5457-5469
- https://doi.org/10.21608/ejchem.2021.69217.3516
Abstract
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.Keywords
This publication has 23 references indexed in Scilit:
- Study of the Relaxation Phenomenon of Poly(vinyl chloride-co-vinylacetate-co-2-hydroxypropyl acrylate)/Poly(methyl methacrylate) Blends Using TSDC-TS Technique: Dipole-dipole Interaction ApproachJournal of the Korean Physical Society, 2011
- The use of the final thermally stimulated discharge current technique to study the molecular movements around glass transitionJournal of Non-Crystalline Solids, 2010
- Polyurethane–POSS hybrids: Molecular dynamics studiesPolymer, 2009
- Effects of nanoscale dispersion in the dielectric properties of poly(vinyl alcohol)-bentonite nanocompositesPhysical Review E, 2008
- Dielectric Relaxation Spectroscopy of Poly (Vinyl Chloride-co-Vinyl Acetate-co-2-Hydroxypropyl Acrylate)/Poly (Acrylonitrile-Butadiene-Styrene) Polymer BlendPolymer-Plastics Technology and Engineering, 2007
- Thermally stimulated discharge current studies of corona polarized pristine and swift heavy ion irradiated kapton-H polyimideRadiation Effects and Defects in Solids, 2006
- Alpha Relaxation Study of Poly(Vinyl Chloride Co-Vinylacetate-Co-2-Hydroxypropyl Acrylate)Polymer-Plastics Technology and Engineering, 2005
- Dielectric study of the molecular mobility and the isothermal crystallization kinetics of an amorphous pharmaceutical drug substanceJournal of Pharmaceutical Sciences, 2004
- α−β Splitting Region in the Dielectric Relaxation Spectrum of PEA-PEMA Sequential IPNsMacromolecules, 2003
- Broad-Band Dielectric Study on Poly(4-vinylphenol)/Poly(ethyl methacrylate) BlendsMacromolecules, 2002