The effect of ozone and high temperature on polymer degradation in polymer core composite conductors

Middleton, J.; Burks, Brian; Wells, Todd A.; Setters, Alexander; Jasiuk, Iwona; Kumosa, M.

doi:10.1016/j.polymdegradstab.2013.08.013

Cited by 38 publications

(18 citation statements)

References 26 publications

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“…With regard to the temperature effect on SCC in GRPs, both physical and chemical aging processes [42][43][44] were certainly involved in the corrosion of all composites at elevated temperatures. For shorter periods of time (for example, for 72 hours) physical aging [42,43] would be more influential increasing the stiffness of the matrix and increasing residual stresses in the matrix and the fibers. On the other hand, elevated temperatures would decrease the residual manufacturing stresses both in the matrix and the fibers reducing the rates of corrosion.…”

Section: Other Factors Contributing To Scc and Its Monitoringmentioning

confidence: 99%

Synergistic effects in stress corrosion cracking of glass reinforced polymer composites

Solis-Ramos

Kumosa

2017

Polymer Degradation and Stability

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Synergistic effects of nitric acid exposure, elevated temperature, applied flexural stress and time were examined in the Stress Corrosion Cracking (SCC) of widely used unidirectional Glass Reinforced Polymer (GRP) composites. The composites were composed of two different E-CR glass fibers with a vinylester-epoxy resin as the matrix with E-glass fibers in the same matrix used for a baseline comparison. SCC damage, as measured by the number of fiber cracks, amount of metallic ion leaching from the fibers, and the reduction of residual flexural strength and stiffness properties of the composites, affected the composites differently depending on their composition. As expected, the E-CR composites greatly outperformed the E-glass composites under all conditions. Long term exposure of the E-CR composites did not greatly increase the amount of stress corrosion fiber damage; instead, interface issues and matrix decomposition led to reduced mechanical properties over extended periods of time. The synergistic effect of the combined testing conditions was found to be much stronger in the E-glass than the E-CR glass composites.

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Section: Other Factors Contributing To Scc and Its Monitoringmentioning

confidence: 99%

Synergistic effects in stress corrosion cracking of glass reinforced polymer composites

Solis-Ramos

Kumosa

2017

Polymer Degradation and Stability

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“…The degradation mechanism of thermo-oxidative ageing can be described through physical changes, densification and shrinkage, that are directly related to the thermo-mechanical history of the material, as well as surface chemical degradation with the formation of microcracks, and chemical changes in the sample [23]. Thermooxidative ageing usually causes degradation of mechanical properties but in some cases, such as reticulated resins, can lead to an improvement in these properties due to the subsequent process of networking [24]. The changes in electrical characteristics caused by these processes are very complex and diverse [6][7][8][9].…”

Section: 2mentioning

confidence: 99%

The detection of the early stages of ageing in an LDPE+graphite composite by comparison of dielectric responses induced by sinusoidal and triangular signals

Petronijević¹,

Simonovic²,

Marinković³

et al. 2014

Express Polym. Lett.

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Abstract. This study describes the possibility of dielectric characterization of the initial stages of ageing in an low-density polyethylene (LDPE) + graphite composite, which is not possible using the standard method of dielectric spectroscopy. It is shown that the differences between the delay angles, #$ = $ TRI -%$ SIN , obtained using triangular and sinusoidal excitations on the composite samples, shows a maximum, and at the same time the position of this maximum shows more sensitivity to changes in the electrical properties of the material caused by ageing than other dielectric parameters. In order to clarify the applied methodology, a comparative analysis of the dielectric properties of other polymers poly(vinyl chloride) (PVC) and poly(vinyl alcohol) (PVA) and a conductive polymer composite (LDPE + carbon black) with respect to the application of sinusoidal and triangular electrical signals was carried out. Based on the presented results, we believe that the position of the peak in the frequency spectra of the difference between the delay angles obtained by using triangular and sinusoidal signals may be a suitable parameter for the dielectric characterization of polymeric materials.

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“…Cycloaliphatic epoxies (CEs) are commonly used for structural applications requiring improved resistance to elevated temperatures, UV radiation, and moisture relative to bisphenol A (DGEBA) and bisphenol F (DGEBF) diglycidyl ether epoxies . Thus, CE composites are particularly important in applications such as high‐voltage electrical insulators and Aluminum Conductor Composite Core (ACCC) high‐voltage power transmission cables, particularly when they are paired with an anhydride curing agent (ACA) which also demonstrates remarkable environmental resistance.…”

Section: Introductionmentioning

confidence: 99%

Multiscale thermal modeling of cured cycloaliphatic epoxy/carbon fiber composites

Chinkanjanarot

Radue

Gowtham

et al. 2018

J of Applied Polymer Sci

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Cycloaliphatic epoxies (CEs) are commonly used for structural applications requiring improved resistance to elevated temperatures, UV radiation, and moisture relative to other epoxy materials. Accurate and efficient computational models can greatly facilitate the development of CE‐based composite materials for applications such as Aluminum Conductor Composite Core high‐voltage power lines. In this study, a new multiscale modeling method is developed for CE resins and composite materials to efficiently predict thermal properties (glass‐transition temperature, thermal expansion coefficient, and thermal conductivity). The predictions are compared to experimental data, and the results indicate that the multiscale modeling method can accurately predict thermal properties for CE‐based materials. For 85% crosslink densities, the predicted glass‐transition temperature, thermal expansion coefficient, and thermal conductivity are 279 °C, 109 ppm °C−1, 0.24 W m−1 K−1, respectively. Thus, this multiscale modeling method can be used for the future development of improved CE composite materials for thermal applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46371.

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The effect of ozone and high temperature on polymer degradation in polymer core composite conductors

Cited by 38 publications

References 26 publications

Synergistic effects in stress corrosion cracking of glass reinforced polymer composites

Synergistic effects in stress corrosion cracking of glass reinforced polymer composites

The detection of the early stages of ageing in an LDPE+graphite composite by comparison of dielectric responses induced by sinusoidal and triangular signals

Multiscale thermal modeling of cured cycloaliphatic epoxy/carbon fiber composites

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