Comparative study of amorphous and partially crystalline poly(ethylene-2,6-naphthalene dicarboxylate) by TSDC, DEA, DMA and DSC

TSDC spectroscopy of relaxational and interfacial phenomena

“…T′ can be computed from Eqs. (3) and (5). The effective dipole moment μ eff deviates from the dipole moment (μ) of the free molecule…”

“…It should be noted that, despite high sensitivity and information content of the TSDC method, it is less well known and used than dielectric relaxation spectroscopy (DRS or dynamic dielectric spectroscopy, DDS), and NMR spectroscopy techniques, used to study the relaxation phenomena observed for soft and solid materials in gaseous or liquid media. The TSDC method was applied for many systems: polymers [1][2][3][4][5][6][7][8][9][10][11][12][13][14], solids [15], metal oxides [16][17][18], crystals [19], dielectrics [20,21], adsorbed and interfacial water and aqueous suspensions of fumed oxides [22,23], hydrogels [24], organics [25], etc. This wide application of the TSDC method suggests the possible use of this technique for a variety of interesting and complex objects such as bio-and nanomaterials, nanocomposites, water in polymers and native or inactivated bioobjects, biosystems, etc.…”

Influence of internal flexibility on the double glass transition in a series of odd non-symmetric liquid crystal dimers characterised by dielectric measurements

“…This temperature is directly related to the glass transition temperature of the material [41]. As T p decreases, this high temperature peak disappears because the related molecular motions are already restricted when the electric field is applied, but a new low temperature discharge peak emerges around 302 K (curve i).…”

“…In Table 1 are listed the values of T 0 , T d , t d and T f used for each material in all the experiments. Additional details of the experimental technique can be found elsewhere [34,37,38].…”

The storage and its stability of space charge in poly(ethylene naphthalene-2,6-dicarboxylate)

“…Thus it is argued to be used as a serious candidate for PET substitution in a large number of applications [1] , and attracts extensive interest of researchers. Indeed, there is a considerable quantity of literatures available on the dielectric and dynamic mechanical properties of PEN [2][3][4][5][6][7][8] . Among these literatures Canadas et al [5] studied the space charge relaxation (ρ relaxation) of PEN by TSD method and calculated relative parameters, but the information on the space charge storage and its stability is still lacking, which is known to be of much importance for dielectrics and electrical insulation, especially for electret applications.…”