On epoxy network structure and dielectric performance

Liu, Y.; Vaughan, A. S.; Hosier, I. L.; Yeung, C.; Andritsch, Thomas

doi:10.1109/ceidp.2015.7352129

Cited by 9 publications

(13 citation statements)

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“…Since the current dielectric measurements were conducted at room temperature, which is well below the measured Tg of the modified epoxy networks, the noticed decrease in the real permittivity is in line with the one described in the previous work [4].…”

Section: DC Conductivitysupporting

confidence: 60%

“…IV. DISCUSSION Previous published work [4] on the effect of reactive diluent on the dielectric properties of epoxy resin demonstrated that the change in the epoxy architecture caused decrease in the Tg as the added weight of reactive modifiers increase. Comparison of this behavior with the data reported here supports the hypothesis that the decrease in Tg can be explained by the fact that the added diluent is a long chain alkyl group (C 19 H 38 O 2 ), which resulted in increased in the free volume in the system and hence caused the noticed decreased Tg.…”

Section: DC Conductivitymentioning

confidence: 94%

“…The relaxation peak at the high frequency can be attributed to β-relaxation, which is associated to the mobility of side chains [7]. According to Lui et al [4], introducing reactive diluent generate an epoxy network with high degree of crosslink than neat epoxy systems due to the introduction of network nodes and small branches. As the epoxy network become highly cross linked the side chains would have smaller ability to movement within the system, which would explain the noticed decrease in β-relaxation as the parts of added reactive diluent increase.…”

Section: DC Conductivitymentioning

confidence: 99%

“…Studies investigated the effect of Tg on the dielectric behavior of similar material [5] and modified epoxy networks [4] reported a decrease in the real permittivity of alkyl modified epoxy networks for permittivity test below Tg. Since the current dielectric measurements were conducted at room temperature, which is well below the measured Tg of the modified epoxy networks, the noticed decrease in the real permittivity is in line with the one described in the previous work [4].…”

Section: DC Conductivitymentioning

confidence: 99%

“…For example, the addition of nano-and microsized fillers which improved the thermal properties of epoxy resin in [2] and changing the architecture structure of the epoxy using reactive modifiers which enhanced the mechanical strength of the epoxy matrix used in [3]. As part of a study of modified epoxy resin systems, the network structure was varied using octyl/decyl glycidyl ether [4]. This showed that the addition of epoxy reactive diluent have introduced a high free volume in the system, and changed the molecular dynamics by creating modified network structure with small branches which resulted in varied electrical and thermal properties of the final solid polymer.…”

Section: Introductionmentioning

confidence: 99%

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On the dielectric performance of modified epoxy networks

Saeedi

Vaughan

Andritsch

2016

2016 IEEE International Conference on Dielectrics (ICD)

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Abstract-Epoxy resins represent a commonly used basis for insulation materials and have been used in many different electrical applications. The formation of these systems involves reactions between a hardener, such as an amine-curing system, and an epoxy terminated resin. Recent studies have reported that epoxy resin systems can exhibit enhanced physical properties when the stoichiometry of the resin is varied using reactive diluent. This has been attributed to the increased free volume within the molecular structures within the epoxy resin network. The work described here set out to investigate this hypothesis concerning the potential benefits of varying the network structure of epoxy resin through the inclusion of monofunctional reactive diluents within the epoxy formulation. This research is of potential significance because any modification of the epoxy resin network results in modified thermal, mechanical and electrical properties and, consequently, represents a potential mean of tailoring overall performance to suit particular applications.

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Section: DC Conductivitysupporting

confidence: 60%

Section: DC Conductivitymentioning

confidence: 94%

Section: DC Conductivitymentioning

confidence: 99%

Section: DC Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the dielectric performance of modified epoxy networks

Saeedi

Vaughan

Andritsch

2016

2016 IEEE International Conference on Dielectrics (ICD)

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The nature of the gamma dielectric relaxation in diglycidyl ether Bisphenol-A (DGEBA) based epoxies

Saeedi

Chalashkanov

Dissado

et al. 2022

Polymer

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Dielectric behaviours of bio‐derived epoxy resins from cashew nutshell liquid

Vaughan

2020

High Voltage

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In this study, four commercially available bio‐derived epoxy systems (extracted from cashew nutshell liquid) were prepared and characterised. The glass transition temperature (T g), dielectric spectroscopy, DC conductivity and breakdown properties of these epoxy resins were studied. Differential scanning calorimetry (DSC) demonstrated that the T g of the investigated systems ranged from 67 to 122°C. The DC conductivity was very low (<10−16 S cm−1) and comparable to the conventional dielectrics at room temperature (RT). However, all systems showed a strong temperature dependence of the electrical conductivity and exhibited sharp increase around their respective T g. Arrhenius analysis led to activation energy, E a, values around 1 eV; higher E a values were observed in systems with a lower T g. Dielectric spectroscopy revealed a flat and low response at temperature below T g. However, both the real and imaginary permittivity increased with decreasing frequency at mid to low frequencies as the temperatures approached T g. The variations of AC breakdown strength of all samples were not statistically significant, but the DC breakdown strength of sample 2503A + 2002B was higher than the others, which might be due to reduced charge transport in this system. The results indicate that novel bio‐derived epoxy systems from renewable sources are potential alternatives for traditional petroleum‐based epoxy systems in certain insulation applications.

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On epoxy network structure and dielectric performance

Cited by 9 publications

References 0 publications

On the dielectric performance of modified epoxy networks

On the dielectric performance of modified epoxy networks

The nature of the gamma dielectric relaxation in diglycidyl ether Bisphenol-A (DGEBA) based epoxies

Dielectric behaviours of bio‐derived epoxy resins from cashew nutshell liquid

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