Characteristics of Gel Time and Dielectric Strength of Epoxy Composite According to the Mixing Ratio of Micro-Fillers

Oh, Dong-Hun; Kim, Ho-Seung; Shim, Joon Ho; Jeon, Youngho; Kang, Dawon; Lee, Bang-Wook

doi:10.3390/en13195165

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…Curing in an autoclave is unfeasible [9,23], so the temperature of 100 °C is the most suitable for the consolidation process of the composites using the current resin (AR 260), since this temperature allows more controlled curing and prevents the formation of voids. According to Oh et al [24] reported in their study regarding gel time for epoxy composites, the temperature of 80 ºC was the longest, which contributes to a more efficient curing process.…”

Section: Gel Time Water Absorption and Volatiles Content Of The Prepregsmentioning

confidence: 98%

Processing Characterization of Sisal/Epoxy Prepregs

Silva

Teixeira

Gontijo

et al. 2021

J. Res. Updates Polym. Sci.

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Quality control to obtain composite laminates is frequently applied to synthetic fibers/epoxy prepregs. The gel time test, resin, volatiles and fiber content, drape measurement and tack tests together with water absorption capacity are methods currently employed. However, for natural fibers prepregs there is a gap in the literature, which makes their application difficult. Thus this work will investigate sisal fibers, which have low cost, high biodegradability and low specific weight, following the common methods to manufacture composites from natural fibers/epoxy prepregs. First, the prepregs were prepared by hand lay-up, aligning the fibers with epoxy, keeping 15% by weight content of fiber. After the quality control characterization, 3 mm thickness composite was prepared by using a press, and tensile tests and scanning electron microscopy (SEM) were applied. As a result, the resin fraction values and the solid content of the matrix showed little variation between the different samples. The natural fibers prepregs absorbed water quickly in the initial stage until reaching the saturation level. The NaOH-treated sisal/epoxy prepreg had a tension of 71.06 ± 8.28 kPa for the tack test and tensile strength of 69.24 ± 11.69 MPa. Finally, the NaOH-treated sisal 15 wt%/epoxy resulted in composites with a better performance than the neat epoxy resin. There was good adhesion between the fibers and matrix, as confirmed by SEM and mechanical tests.

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Section: Gel Time Water Absorption and Volatiles Content Of The Prepregsmentioning

confidence: 98%

Processing Characterization of Sisal/Epoxy Prepregs

Silva

Teixeira

Gontijo

et al. 2021

J. Res. Updates Polym. Sci.

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“…Several authors studied the effect of graphene, MOFs, and alumina loadings on epoxy and studied the thermal and electrical properties. [16][17][18][19] The addition of fillers like SrTiO 3 , Al_FA_A, Al_TPH_450°C_3h, and GO decreases the thermal stability and also it shows 2 distinct degradation stages. The epoxy/TGPAP particulate nanocomposites show initial mass loss of ∼15% and then the major second degradation occurs at 300°C to 490°C.…”

Section: Resultsmentioning

confidence: 99%

“…Several authors studied the effect of graphene, MOFs, and alumina loadings on epoxy and studied the thermal and electrical properties. 16–19…”

Section: Resultsmentioning

confidence: 99%

Thermal, mechanical, and electrical properties of difunctional and trifunctional epoxy blends with nanoporous materials

Ganesan¹,

Jeyadevi

Sundari

et al. 2021

Journal of Elastomers & Plastics

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In the present study, the aim is to synthesize the particulate nanocomposites with difunctional and trifunctional epoxy blend as matrix and synthesized nanoporous materials as fillers. Organic/inorganic hybrid networks were prepared by the novel solvent free method. Viscoelastic, thermal, and electrical properties of di- and trifunctional epoxy and the effect of different nanoparticles in the particulate nanocomposites have been studied by dynamic mechanical analyzer, thermogravimetry (TGA), and dielectric strength. Epoxy mixed with different compositions of TGPAP and particulate nanocomposites by the addition of different types of nanomaterials shows higher storage modulus than the pure epoxy. The addition of TGPAP and nanofillers decreases the thermal stability of epoxy matrix. The evolved gas analysis (TG-FTIR) was also done in order to study the products formed during degradation. An increase in dielectric strength and impact strength (4%) was also observed in the particulate nanocomposites.

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“…Usually, when the concentration of semiconducting filler reaches a certain level or more, the composite material can reveal obvious nonlinear conductivity, and the nonlinear properties intensify as the filler concentration increases. However, the high content of semiconducting materials will lead to less breakdown strength and mechanical properties, which limits the application of and mechanical properties, which limits the application of nonlinear materials stances of inorganic nano-oxides can capably help the breakdown strength of as SiO2 [4], Al2O3 [5], MgO [6], TiO2 [7], ZrO2 [8], ZnO [9], etc. The agglomeratio occurs when the nanofiller is excessively loaded due to the small size effect o with high surface energy, which declines the performance of nanocomposit present research about nanodielectric is conducted on the interface, i.e., the na tion region between nanoparticles and polymer matrix, and the nanoparticle in matically shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Properties and Simulating Research of Epoxy Resin/Micron-SiC/Nano-SiO2 Composite

et al. 2022

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The dielectric behavior of insulations is a key factor affecting the development of anti-corona materials for generators. Epoxy resin (EP), as the matrix, is blended with inorganic fillers of micron SiC and nano SiO2 to investigate the effect of micro and nano doping on the conductivity and breakdown mechanism of the composites. Using experimental and simulation analysis, it is found that the effect of nano-SiO2 doping concentration on the conductivity is related to the dispersion of SiC particles. The lower concentration of SiO2 could decrease the conductivity of the composites. The conductivity increases with raising the nano-SiO2 doping concentration to a critical value. Meanwhile, the breakdown field strength of the composites decreases with the rising content of SiC in constant SiO2 and increases with more SiO2 when mixed with invariable SiC. When an equivalent electric field is applied to the samples, the electric field at the interface of micron particles is much stronger than the average field of the dielectric, close to the critical electric field of the tunneling effect. The density of the homopolar space charge bound to the surface of the stator bar elevates as the concentration of filled nanoparticles increases, by which a more effective Coulomb potential shield can be built to inhibit the further injection of carriers from the electrode to the interior of the anti-corona layer, thus reducing the space charge accumulation in the anti-corona layer as well as increasing the breakdown field strength of the dielectric.

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Characteristics of Gel Time and Dielectric Strength of Epoxy Composite According to the Mixing Ratio of Micro-Fillers

Cited by 5 publications

References 26 publications

Processing Characterization of Sisal/Epoxy Prepregs

Processing Characterization of Sisal/Epoxy Prepregs

Thermal, mechanical, and electrical properties of difunctional and trifunctional epoxy blends with nanoporous materials

Properties and Simulating Research of Epoxy Resin/Micron-SiC/Nano-SiO2 Composite

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