Effect of pressure on the water relaxation in glassy polyetherimide

Fontanella, J. J.; Bendler, John T.; Schuele, D. E.; Edmondson, Charles A.; Lomax, Joseph F.

doi:10.1016/j.jnoncrysol.2007.01.087

Cited by 11 publications

(20 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The VTF parameters obtained from the analysis were B = 2.156 × 10 8 , D = −446.86, and T = 469.32. Using the interpolation value at log 10 ω 0 = −2 for the T g estimate, the glass transition T g temperature of film polyetherimide is 214.57 o C, which is close to the values published in the literature [4,5,10]. The data from Fontanella et al [10] for the α-relaxation is plotted in Fig.…”

Section: Relaxation Mapsupporting

confidence: 81%

“…(9) and Eq. (10). These values are much higher to those reported for other polymers in the literature [11,[64][65][66].…”

Section: Fragility Of Polyetherimidementioning

confidence: 52%

“…The frequency ν window in the measurement was between 0.3Hz and 1MHz. Since polyetherimide is prone to absorb water [10], the sample was pre-heated under nitrogen flow to 200 o C to remove water; this temperature was close to the reported glass transition temperature in the product sheet (T g = 215 by ASTM D3418). The temperature during the measurements were between -110 o C and 270 o C.…”

Section: Methodsmentioning

confidence: 90%

“…Only the α relaxation yields maximum relaxation times at temperatures higher than the glass transition temperature T g . The data from Fontanella et al [10] is also shown in the figure with solid lines (curve 'D'). The literature data was not able to represent the relaxations resolved in our analysis, which might be due to slight differences in the raw materials and temperature range; we were able to perform measurements up to 270 o C. In Fig.…”

Section: Relaxation Mapmentioning

confidence: 95%

See 3 more Smart Citations

Electrical properties of polyetherimide thin films: Non-parametric dielectric response analysis with distribution of relaxation times

Tuncer

2017

Eur. Phys. J. E

View full text Add to dashboard Cite

High temperature polymeric materials for electrical insulation and energy storage are needed for transformational power applications such as pulsed-power and hybrid electrical vehicles. One of the candidate materials has been polyetherimide, an amorphous thermoplastic with a glass transition over 200 C. Here, the dielectric studies on the material are reported by taking into account the polarization and conduction processes in the polyetherimide. The dielectric data were analyzed with the distribution of relaxation times approach with Debye expression as the kernel in the inversion algorithm, the results then created the relaxation map for polyetherimide. The method satisfies the Kramers-Kronig relationships, so the ohmic conductivity and permittivity at high frequencies could be estimated from the experimental data even if there exists significant measurement error. The data were compared to the published results on polyetherimide in the literature. The materials is a low loss polymer with negligible ohmic losses below 200C. The estimated fragility of the polyetherimide was high about 284 from the resolved relaxation map using the Vogel-Fulcher-Tammann-Hesse expression. Polyetherimide is a good dielectric for advanced energy storage and electrical insulation technologies up to 200 C.

show abstract

Section: Relaxation Mapsupporting

confidence: 81%

“…(9) and Eq. (10). These values are much higher to those reported for other polymers in the literature [11,[64][65][66].…”

Section: Fragility Of Polyetherimidementioning

confidence: 52%

Section: Methodsmentioning

confidence: 90%

Section: Relaxation Mapmentioning

confidence: 95%

See 2 more Smart Citations

Electrical properties of polyetherimide thin films: Non-parametric dielectric response analysis with distribution of relaxation times

Tuncer

2017

Eur. Phys. J. E

View full text Add to dashboard Cite

show abstract

“…Their low loss behaviour and high glass transition temperature make them valuable alternative to some of conventional electrical insulation materials and dielectrics, i.e., polypropylene based thin film electrostatic capacitors [20,21]. Previous studies on poly(ether-imide)s have indicated that the dielectric behaviour as a function of temperature and frequency were different in strong relation with the chemical structure [22] and the moisture content [23]. The behaviour of charge mobility and polarization determines the electrostatic charging of the film and how it can be dissipated during the production of capacitor devices [24].…”

Section: Introductionmentioning

confidence: 99%

Local and segmental motion in highly transparent and low-k poly(ether-imide) films

Damaceanu

Brumă

2014

J Polym Res

View full text Add to dashboard Cite

One series of poly(ether-imide)s containing oxadiazole units have been studied with respect to the relationship between the chains structure and their physical properties, particularly thermal transitions and dielectric behavior with emphasis on the local and segmental motion, and optical clarity. High-temperature solution polycondensation reactions of an oxadiazole-containing diamine with different bis(etheranhydride)s resulted in easy soluble polymers with high molecular weights. The variation of the real and imaginary parts of the dielectric permittivity in a large frequency range, from 10 to 10 6 Hz, and in a wide temperature domain, from −150 to 250°C of the tough free-standing films prepared from these polymers was registered. The dielectric constant values, measured at room temperature and in the frequency domain of 10 Hz −1 MHz, were lower or comparable with those of Kapton HN film measured under similar conditions. The dielectric spectroscopy data were corroborated with the dynamo-mechanical analysis ones to highlight the subglass and glass relaxations encountered in these polymer films. The γ and β sub-glass viscoelastic and dielectric relaxations were explored in order to understand their molecular origins, being discussed in correlation with polymers repeating unit structure. The optical transparency of the poly(ether-imide) films has been also studied, to survey their potential for use as flexible substrates in electronic and optical devices.

show abstract

A molecular dynamics simulation study of three polysulfones in dry and hydrated states

Marque¹,

Verdú²,

Prunier³

et al. 2010

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

Molecular dynamics (MD) simulations of three polysulfones (poly(ether sulfone) PESU, poly(phenylene sulfone) PPSU and polysulfone PSU) in dry and hydrated states were undertaken in order to study the specific interactions between water and glassy polymer matrices of the same structural family. Dry polysulfone models were generated using a hybrid pivot Monte Carlo‐MD single‐chain sampling technique and the resulting relaxed densities were found to be in close agreement with experimental data. Hydrated systems are found to reproduce quite well volumetric changes experimentally observed. The concentrations of sulfonic groups can explain qualitatively their different water solubilities. Water is preferentially hydrogen‐bonded to two sites which either link two polymer sites, or one polymer site and another water, or two other waters. A detailed analysis of these water bridges that are formed is presented. Only a small quantity of potential bridging sites are occupied for water contents near the experimental saturation. The free fractional volumes, the probe accessible volumes, the swelling of the polymers, the water‐polymer interactions and the hydrogen bond lifetimes, are also presented for these polysulfones. Water‐water interactions and water clusters are found to be more important in the more hydrophilic PESU in comparison to the less hydrophilic PSU. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2010

show abstract

Effect of pressure on the water relaxation in glassy polyetherimide

Cited by 11 publications

References 5 publications

Electrical properties of polyetherimide thin films: Non-parametric dielectric response analysis with distribution of relaxation times

Electrical properties of polyetherimide thin films: Non-parametric dielectric response analysis with distribution of relaxation times

Local and segmental motion in highly transparent and low-k poly(ether-imide) films

A molecular dynamics simulation study of three polysulfones in dry and hydrated states

Contact Info

Product

Resources

About