Effect of Ageing on the Tracking Characteristics of High-Temperature Vulcanized Silicone Rubber Hybrid Composites for High Voltage Insulation

Shaik, Mohamed Ghouse; Vijayarekha, K.

doi:10.3390/ma13102242

Cited by 8 publications

(4 citation statements)

References 36 publications

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“…The weight loss of SR-MRE after thermal aging might probably attribute to the reorientation of matrix-particles and low molecular weight owing to the continuous high temperature and degradation phenomenon occurred during thermal aging. The influence of thermal aging is well known for changing the flexibility of the polymer chains inside the SR-MRE sample, and thus resulted in more chains movement by leaving spaces between them [24]. As shown in Figure 1, cross-section surfaces of the SR-MRE gross micrograph are observed both before and after thermal aging.…”

Section: Weight Of Sr-mrementioning

confidence: 96%

Thermal Aging Rheological Behavior of Magnetorheological Elastomers Based on Silicone Rubber

Aziz

Mazlan

Ubaidillah

et al. 2020

IJMS

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Engineering rubber composites have been widely used as main components in many fields including vehicle engineering and biomedical applications. However, when a rubber composite surface area is exposed to heat or sunlight and over a long-term accelerated exposure and lifecycle of test, the rubber becomes hard, thus influencing the mechanical and rheological behavior of the materials. Therefore, in this study, the deterioration of rheological characteristics particularly the phase shift angle (δ) of silicone rubber (SR) based magnetorheological elastomer (MRE) is investigated under the effect of thermal aging. SR-MRE with 60 wt% of CIPs is fabricated and subjected to a continuous temperature of 100 °C for 72 h. The characterization of SR-MRE before and after thermal aging related to hardness, micrograph, and rheological properties are characterized using low vacuum scanning electron microscopy (LV-SEM) and a rheometer, respectively. The results demonstrated that the morphological analysis has a rough surface and more voids occurred after the thermal aging. The hardness and the weight of the SR-MRE before and after thermal aging were slightly different. Nonetheless, the thermo-rheological results showed that the stress–strain behavior have changed the phase-shift angle (δ) of SR-MRE particularly at a high strain. Moreover, the complex mechanism of SR-MRE before and after thermal aging can be observed through the changes of the ‘in-rubber structure’ under rheological properties. Finally, the relationship between the phase-shift angle (δ) and the in-rubber structure due to thermal aging are discussed thoroughly which led to a better understanding of the thermo-rheological behavior of SR-MRE.

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Section: Weight Of Sr-mrementioning

confidence: 96%

Thermal Aging Rheological Behavior of Magnetorheological Elastomers Based on Silicone Rubber

Aziz

Mazlan

Ubaidillah

et al. 2020

IJMS

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“…In Figure 3.2 (c) the treated anisotropic MRE sample shows a storage modulus value that is almost the same as the storage modulus of an isotropic MRE sample without treatment. This indicates that weather treatment can damage the particle chains' arrangement that occurs in anisotropic MRE samples [28][29][30][31]. The breakdown of the particle chain arrangement occurred in all anisotropic MRE specimens and brought all storage modulus values close to the storage modulus of the isotropic MRE samples.…”

Section: Rheological Propertiesmentioning

confidence: 84%

Performance Degradation of Silicon Based Magnetorheological Elastomer Under Accelerated Weathering Treatment

Wibowo¹,

Lenggana²,

Ubaidillah³

et al. 2020

Preprint

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Silicone RTV-based engineering rubber composite products have been widely used for several applications in various fields as a major component such as structure, automotive, and medical. In its application, the rubber composite product is placed in an open area that is directly exposed to sunlight and rain. It has a significant negative impact on changes in chemical and rheological properties, making the product life of rubber composite products shorter. Therefore, in this study, changes in the chemical and rheological properties of both isotropic and anisotropic magnetorheological elastomer (MRE) treated with accelerated weathering were studied compared to untreated specimens with specimens that had been treated. MRE specimens with 40% by weight CIP were prepared with no current excitation and another sample were made under 1.5 T of magnetic flux density. Each specimen was treated in an accelerated weathering machine Q-Sun Xe-1 Xenon Test Chamber with a UV light exposure cycle for 102 minutes and 18 minutes of UV light combined with water spray for 24 hours followed by a condensation cycle of 4 hours in a dark period. Material characterization was carried out using FTIR and Rheometer to determine the changes in chemical and rheological properties. The morphological analysis results showed that the surface was rough and more cavities occurred after being given weather treatment. Rheometer test results showed a decrease in storage modulus in each MRE specimen that had been treated compared to untreated MRE specimens. Meanwhile, FTIR testing showed a change in wave peak between untreated and treated MRE specimens.

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“…In Figure 3 c, the treated anisotropic MRE sample showed a storage modulus value that was almost identical to the storage modulus of an isotropic MRE sample without treatment. This indicates that weather treatment can damage the particle chain arrangement that occurs in anisotropic MRE samples [ 28 , 29 , 30 , 31 ]. The breakdown of the particle chain arrangement occurred in all anisotropic MRE specimens and brought all storage modulus values close to the storage modulus of the isotropic MRE samples.…”

Section: Resultsmentioning

confidence: 99%

Declining Performance of Silicone-Based Magnetorheological Elastomers after Accelerated Weathering

et al. 2021

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Magnetorheological elastomers (MRE)-based products are usually located in an area directly exposed to sunlight and rain. However, there is no specific research on the behavior of MRE after accelerated weathering. Therefore, in this study, the changes to the chemical and rheological properties of both isotropic and anisotropic MRE after accelerated weathering were examined. Treated and untreated specimens were compared. MRE specimens with 40% by weight CIP were prepared with no current excitation and another sample was prepared with 1.5 T of magnetic flux density. Each specimen was treated in an accelerated weathering machine, Q-Sun Xe-1 Xenon Test Chamber, under a UV light exposure cycle and water spray. A material characterization was carried out using FTIR and a rheometer to determine the changes to the chemical and rheological properties. The morphological analysis results showed that after the weather treatment, the surface was rough and more cavities occurred. The rheometer test results showed a significant decrease in the storage modulus of each treated MRE specimen, unlike the untreated MRE specimens. The decrease in the storage modulus value with currents of 0, 1, 2, and 3 Amperes was 66.67%, 78.9%, 85.2%, and 80.5%, respectively. Meanwhile, FTIR testing showed a change in the wave peak between the untreated and treated MRE specimens. Thermogravimetric analysis (TGA) also showed a decrease in MRE weight for each specimen. However, for both treated and untreated MRE specimens, the decrease in TGA was not significantly different. In all the tests carried out on the MRE samples, weather acceleration treatment caused significant changes. This is an important consideration for developers who choose silicone as the MRE matrix.

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Effect of Ageing on the Tracking Characteristics of High-Temperature Vulcanized Silicone Rubber Hybrid Composites for High Voltage Insulation

Cited by 8 publications

References 36 publications

Thermal Aging Rheological Behavior of Magnetorheological Elastomers Based on Silicone Rubber

Thermal Aging Rheological Behavior of Magnetorheological Elastomers Based on Silicone Rubber

Performance Degradation of Silicon Based Magnetorheological Elastomer Under Accelerated Weathering Treatment

Declining Performance of Silicone-Based Magnetorheological Elastomers after Accelerated Weathering

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