Dielectric and mechanical characterization of processing and moisture uptake effects in E-glass/epoxy composites

Li, Y; Cordovez, Martin; Karbhari, Vistasp M.

doi:10.1016/s1359-8368(02)00133-6

Cited by 35 publications

(20 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is well known that nanocomposites have a large volume fraction of interfaces where interfacial polarizations are most likely to occur. Interfacial polarization influences the dielectric permittivity at low frequencies and usually decreases with increasing frequency 41, 42. As shown in Fig.…”

Section: Resultsmentioning

confidence: 90%

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO₃nanoparticles

Choudhury

2012

Polym. Int.

View full text Add to dashboard Cite

Polyetherimide (PEI)/hydroxyl‐functionalized barium titanate (BaTiO3) nanocomposite films were successfully prepared through solution‐casting followed by subsequent thermal imidization. The results of Fourier transform infrared spectroscopy confirmed that the chemical treatment with hydrogen peroxide (H2O2) could efficiently derive hydroxyl groups on the surface of BaTiO3 nanoparticles. The strong interaction between the hydroxyl‐functionalized BaTiO3 and the PEI matrix greatly enhanced the particle dispersion as well as the interfacial adhesion, as evidenced by scanning electron microscopy. The PEI nanocomposite with hydroxyl‐functionalized BaTiO3 nanoparticles (50 vol% BaTiO3 loading) showed an increased dielectric permittivity of 52.78 at 1 kHz compared with the dielectric permittivity (33.87) of PEI/raw BaTiO3 composite. The loss tangent was still low (less than 0.03) when the content of hydroxyl‐functionalized BaTiO3 was 50 vol%. For PEI/BaTiO3 nanocomposites, the frequency and temperature dependences of the dielectric properties were significantly reduced through functionalizing the surface of BaTiO3 nanoparticles with H2O2. Different theoretical approaches were employed to predict the effective permittivity of the nanocomposite systems and the results are compared with the experimental results. Copyright © 2012 Society of Chemical Industry

show abstract

Section: Resultsmentioning

confidence: 90%

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO₃nanoparticles

Choudhury

2012

Polym. Int.

View full text Add to dashboard Cite

show abstract

“…At high temperature range, the Composite (1) shows an increase in real and imaginary parts of the permittivity. This was explained by the presence of a conduction phenomenon and MWS polarization effect, which is due to the building‐up of free charges at the interface between the components of heterogeneous systems . In fact, these free charges, which were present at the stage of processing, are now immobilized in materials.…”

Section: Resultsmentioning

confidence: 99%

Effect of Alfa fiber mechanical separation on dielectric properties of hybrid unsaturated polyester composites

et al. 2018

View full text Add to dashboard Cite

An exhaustive study of dielectric and impedance analysis on two Alfa‐fiber‐reinforced unsaturated polyester hybrid composites was performed. Alfa fiber reinforcements were hybridized by wool and PE/PET fibers in the relative volume fraction ratio 17:2:1. However, these reinforcements differ by the number of mechanical separation of Alfa fibers in the Shirley analyzer. For Composite (1), Alfa fibers were separated mechanically once in the Shirley analyzer whereas for the Composite (2), they were separated mechanically twice in the Shirley analyzer. Dielectric parameters analysis (ɛ′, ɛ″) revealed the presence of the α‐relaxation process at intermediate temperature range for the matrix and the water dipoles polarization at low temperatures for the Composite (1). No dynamic dielectric relaxation was observed for the Composite (2) at low temperatures. However, dielectric properties were controlled by the dc conductivity effect at higher temperatures. The Kramers‐Kronig relation was used to eliminate its effect. Hence, α mode relaxation was observed for the matrix and the interfacial polarization effect was observed for its composites. The attenuated effect of this latter for the Composite (2) was attributed to its homogeneous structure. Electrical conductivity analysis using the Jonscher law allowed determining the transport mechanism for all studied materials and confirmed such result. Complex impedance analysis supported the homogeneous structure for the Composite (2). POLYM. COMPOS., 40:1774–1785, 2019. © 2018 Society of Plastics Engineers

show abstract

“…e 00 and e 00 are experimental data that characterize the energy storage and dissipation -losses -during every cycle and they can be used to characterize the electrical dispersion at a given frequency interval. Previous works showed that the dielectric constant increases with water absorption [4][5][6][7]. This effect varies with frequency.…”

Section: Introductionmentioning

confidence: 92%

Relationship between Water Absorption and Dielectric Behavior of Glass Fiber Reinforced Unsaturated Polyester Resin

Fraga

Frullloni

Osa

et al. 2007

Journal of Composite Materials

View full text Add to dashboard Cite

Water uptake at 25 C is measured for unsaturated polyester matrix and glass fiber composites as a function of time. Dielectric measurement in the frequency range of 1 MHz-1 GHz has been performed on the specimens during the water absorption process. The dielectric constant decreases as the frequency increases for matrix and composites. The dielectric constant of unsaturated polyester is lower than their composites based on glass fibers. A Fickian diffusion model is applied for water absorption studies, and the effective diffusion coefficient is calculated for each sample. An empirical model describing the increase in dielectric constant with water absorption is proposed.

show abstract

Dielectric and mechanical characterization of processing and moisture uptake effects in E-glass/epoxy composites

Cited by 35 publications

References 9 publications

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO₃nanoparticles

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO₃nanoparticles

Effect of Alfa fiber mechanical separation on dielectric properties of hybrid unsaturated polyester composites

Relationship between Water Absorption and Dielectric Behavior of Glass Fiber Reinforced Unsaturated Polyester Resin

Contact Info

Product

Resources

About

Dielectric and mechanical characterization of processing and moisture uptake effects in E-glass/epoxy composites

Cited by 35 publications

References 9 publications

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO3nanoparticles

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO3nanoparticles

Effect of Alfa fiber mechanical separation on dielectric properties of hybrid unsaturated polyester composites

Relationship between Water Absorption and Dielectric Behavior of Glass Fiber Reinforced Unsaturated Polyester Resin

Contact Info

Product

Resources

About

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO₃nanoparticles

Preparation, characterization and dielectric properties of polyetherimide nanocomposites containing surface-functionalized BaTiO₃nanoparticles