Field-induced thermally stimulated currents

Vanderschueren, J.; Gasiot, J.

doi:10.1007/3540095950_10

Cited by 194 publications

(172 citation statements)

References 151 publications

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“…37 The method allows for a quick characterization of the overall dielectric response of the material under investigation with high sensitivity and high peak resolving power while offering techniques to analyze experimentally complex relaxation mechanisms into approximately single responses. 37 The TSC scans were performed in vacuum (10 -2 -10 -4 Pa), usually in the range -243 to +77°C (or to 180°C for blends with w PEO e 20 wt %), E p ≈ 2.0 × 10 6 V/m, t p ) 5 min, and b ) 5°C/min. Samples of typical dimensions (5 × 5 × 1) mm 3 were used.…”

Section: Thermally Stimulated Currents (Tsc)mentioning

confidence: 99%

Nanoscale Confinement Effects on the Relaxation Dynamics in Networks of Diglycidyl Ether of Bisphenol-A and Low-Molecular-Weight Poly(ethylene oxide)

et al. 2007

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Thermoplastic poly(ethylene oxide) (PEO) (M w(PEO) ≈ 4000) has been used to prepare thermosetting nanocomposites incorporating diglycidyl ether of bisphenol A (DGEBA) epoxy oligomer. Blends with various PEO/DGEBA weight ratios were cured using stoichiometric portions of 4,4′-diaminodiphenylmethane. The resulting semi-interpenetrating polymer networks were studied by several techniques. Nanoscale confinement effects, thermal (glass transition, melting and crystallization temperatures) and structural features of our materials are similar to those for networks with much higher M w(PEO) and different curing agents; however, the polyether crystallization onset occurs in our case at a lower PEO concentration; shorter PEO chains organize themselves more easily into crystalline domains. Very low estimates of the k parameter of the Gordon-Taylor equation, used to fit the compositional dependences of the dielectric and calorimetric glass transition temperatures, and a strong plasticization of the motion of the glyceryl segments ( -relaxation) in the epoxy resin were observed. These illustrate an intensified weakening in the strength of the intermolecular interactions in the modified networks, as compared to the high strength of the self-association of hydroxyls in the neat resin. The significance of hydrogen-bonding interactions between the components for obtaining structurally homogeneous thermoseti-thermoplastic networks is discussed.

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Section: Thermally Stimulated Currents (Tsc)mentioning

confidence: 99%

Nanoscale Confinement Effects on the Relaxation Dynamics in Networks of Diglycidyl Ether of Bisphenol-A and Low-Molecular-Weight Poly(ethylene oxide)

et al. 2007

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“…The aim of the second heating to 440 K was to observe the process of thermal denaturation of dry sh collagen in this temperature [5]. 4. Results and discussion Figures 1 and 2 show the electric conductivity temperature relation recorded for particular materials.…”

Section: Methodsmentioning

confidence: 99%

Influence of Transitional Metals Doping on Conductivity of Collagen Lyophilisate and Elastin

Gauza

Kubisz

2012

Acta Phys. Pol. A

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Knowing that conductivity is a temperature function σ = f (T ) allows us to estimate the thermal stability of collagen preparations from sh skin. Measurements can provide information, which is crucial for technologies applying this type of collagen. Conductivity σ measurements were performed in a constant electric eld E = 1 kV/m, in the temperature range of 290480 K. White collagen lyophilisate was used as control material. It contained neither elastin nor melanin dopants nor non-organic dopants such as gold, copper, silver or zinc. Gold, copper, silver and zinc belong to the group of transitional metals and they have intermediate properties of both alkaline metals and metals in the p block of the periodic table. The common feature of most of these elements is their ability to form coordination complexes of intense color. In the measured materials peaks were found in the temperature range of 303323 K. Peak temperature and its shape depend on the type of material. In the case of nano-gold doping a drop in peak temperature and a decrease in conductivity were observed. The measured materials are characterized by lower thermal resistance than bovine collagen. Nevertheless, thermal stability of sh skin collagen is high enough for sh skin collagen to replace bovine collagen. The measurement results obtained for white collagen and white collagen with Zn 2+ may indicate better bonding of free water. The presence of nano-silver and nano-copper as doping agents in graphite collagen may lead to a decrease in hygroscopy of the material and, as a result, may increase its resistance to bacteria.

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“…PSF is composed of phenylene units linked by three different chemical groups: isopropylidene, ether, and sulfone, as shown in Figure 1. Considerable efforts have been devoted by many researchers [6][7][8][9][10] to study the new class of polymer composites reinforced with nanosized particles or structures dispersed in polymer matrix resulting in enhanced properties. However, retaining the homogeneous dispersion of nanosized particle within the polymer matrix during the synthesis of nanocomposites is very difficult due to the strong tendency for nanoparticles to agglomerate.…”

Section: Introductionmentioning

confidence: 99%

Structural Modification of Polysulfone doped Cu2O Nanospheres

Sharma¹

2015

Appl. Sci. Lett.

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Semiconductor reinforced polymer nanocomposite materials are of great interest nowdays. The present communication describes the reinforcement of cuprous oxide (Cu2O) within polysulfone matrices. The conversion of amorphous to crystalline phase will be determined using X-ray diffraction and FT-IR studies. The morphological investigations have been carried out employing atomic force microscopy. The optical transition has been studied using UV-Visible spectroscopy. The successful grafting of semiconductor nanosphere within the polymer matrix efficaciously increases the industrial application of polysulfone.

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Field-induced thermally stimulated currents

Cited by 194 publications

References 151 publications

Nanoscale Confinement Effects on the Relaxation Dynamics in Networks of Diglycidyl Ether of Bisphenol-A and Low-Molecular-Weight Poly(ethylene oxide)

Nanoscale Confinement Effects on the Relaxation Dynamics in Networks of Diglycidyl Ether of Bisphenol-A and Low-Molecular-Weight Poly(ethylene oxide)

Influence of Transitional Metals Doping on Conductivity of Collagen Lyophilisate and Elastin

Structural Modification of Polysulfone doped Cu2O Nanospheres

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