Effect of UV radiation aging on creepage discharge characteristics of high temperature vulcanized silicon rubber at high altitude

Fu, Jin; Zhou, Yuanxiang; Liang, Bin

doi:10.1088/2058-6272/aaff0c

Cited by 12 publications

(4 citation statements)

References 20 publications

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“…It can be seen that with the increment of the modification time, the water contact angle declines consistently, and the hydrophobicity is changed to hydrophilicity after 180 s plasma treatment. This is attributed to the increased concentration of hydroxyl -OH [23]. However, after 30 d aging, the hydrophobicity is recovered due to the decreased content of hydroxyl -OH.…”

Section: Physicochemical Analysismentioning

confidence: 99%

Surface potential decay and DC surface flashover characteristics of DBD plasma-treated silicone rubber

Guan¹,

Chen²,

Du³

et al. 2020

Nanotechnology

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This paper presents an investigation on DC flashover voltage of silicone rubber (SiR) improved by dielectric barrier discharge (DBD) plasma treatments under ambient atmospheric pressure air. DC surface conductivity, surface potential decay (SPD), DC surface flashover voltage, partial discharge magnitude, Fourier transform infrared (FT-IR) spectrograms, and surface water contact angles are measured to analyze the influence of plasma treatment on the SiR. It is found that the speed of SPD increase consistently with the plasma modification time. The tendency of flashover voltage is increasing at first and then decreasing with the increased time of the plasma treatment. The magnitude and number of partial discharge pulses increase apparently with the increased plasma treatment time. Physicochemical measurements indicate that more amount of polar groups appear on surface after the DBD plasma modification, whereas the surface water contact angles decline continuously with the increased plasma modification time. However, the hydrophobicity is recovered after 30 d exposure in the air. It is demonstrated that the SPD is accelerated significantly due to the increased surface conductivities and density of shallow traps. However, the reduction of flashover voltage after longer time of the plasma treatment is attributed to the increased mobility of charge carriers on the sample surface.

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Section: Physicochemical Analysismentioning

confidence: 99%

Surface potential decay and DC surface flashover characteristics of DBD plasma-treated silicone rubber

Guan¹,

Chen²,

Du³

et al. 2020

Nanotechnology

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show abstract

“…Figure 1 b shows that the hardness and crosslink density of the samples increase from 67° and 5.88 × 10 −5 mol g −1 to 90° and 4.69 × 10 −4 mol g −1 , respectively, after hot-air ageing at 240 °C. The results can be attributed to the enhanced crosslink density of the MPVQ rubber after thermal ageing 24 – 27 .…”

Section: Resultsmentioning

confidence: 98%

The microwave-absorption properties and mechanism of phenyl silicone rubber/CIPs/graphene composites after thermal-aging in an elevated temperature

Yan

Guo

Jiang

2022

Sci Rep

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Recently, the application and development of flexible microwave-absorption composites based on silicone rubber have gradually become a research hot spot. In this study, methyl vinyl phenyl silicone rubber (MPVQ)/carbonyl iron particles (CIPs)/graphene (GR) composites were prepared by mechanical blending, and the effects of thermal-ageing temperature on the microwave-absorption properties of the composites were investigated. The mechanism of the thermal-ageing temperature’s effects on microwave-absorption behaviour was identified. The results show that unaged composites have superior microwave-absorption properties, with a minimum reflection loss (RLmin) of − 87.73 dB, a lowest thickness of 1.46 mm, and an effective absorption bandwidth (EAB, RL < − 10 dB) reaching 5.8 GHz (9.9–15.7 GHz). With ageing at 240 °C for 24 h, the RLmin at a frequency of 5.48 GHz is − 45.55 dB with a thickness of 2.55 mm, and the EAB value reaches 2 GHz (range 4.6–6.6 GHz). In the thermal-ageing process, a crosslinking reaction occurs in MPVQ with an increase in crosslinking density from 5.88 × 10−5 mol g−1 (unaged) to 4.69 × 10−4 mol g−1 (aged at 240 °C). Simultaneously, thermal degradation of the composites leads to a reduction in the rubber concentration. In addition, a small amount of CIPs are oxidized to Fe3O4, and the remaining CIPs aggregate to generate more electrically conductive pathways. Consequently, the dielectric loss of the composites will be significantly improved, resulting in poor impedance matching. The microwave-absorption properties of the composites gradually decrease with increasing thermal-ageing temperature from 200 to 240 °C.

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“…Youn and Huh (2002) found that the water contact angle of the SR decreased from 108° to 98° under aging for 5000 h at ultraviolet irradiation conditions, and the hydrophobicity decreased to a certain extent. Related research discovered that as UV aging time increased, the porosity of the SR surface increased, but their growth rate decreased, the SiO 2 filler on the surface was lost, and the C–H bond in CH 3 and the CH 3 bond in Si–CH 3 increased (Jin et al., 2019; Lin et al., 2019).…”

Section: Silicone Rubber Agingmentioning

confidence: 99%

Progress in research on the safety of silicone rubber products in food processing

Liu

Wang

2023

Comp Rev Food Sci Food Safe

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Silicone rubber (SR) is widely used in the food processing industry due to its excellent physical and chemical properties. However, due to the differences in SR product production formulas and processes, the quality of commercially available SR products varies greatly, with chemical and biological hazard potentials.Residual chemicals in SR, such as siloxane oligomers and 2,4-dichlorobenzoic acid, are non-intentionally added substances, which may migrate into food during processing so the safe use of SR must be guaranteed. Simultaneously, SR in contact with food is susceptible to pathogenic bacteria growing and biofilm formation, like Cronobacter sakazakii, Staphylococcus aureus, Salmonella enteritidis, and Listeria monocytogenes, posing a food safety risk. Under severe usage scenarios such as high-temperature, high-pressure, microwave, and freezing environments with long-term use, SR products are more prone to aging, and their degradation products may pose potential food safety hazards. Based on the goal of ensuring food quality and safety to the greatest extent possible, this review suggests that enterprises need to prepare high-quality food-contact SR products by optimizing the manufacturing formula and production process, and developing products with antibacterial and antiaging properties. The government departments should establish quality standards for food-contact SR products and conduct effective supervision. Besides, the reusable SR products should be cleaned by consumers immediately after use, and the deteriorated products should be replaced as soon as possible.

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Effect of UV radiation aging on creepage discharge characteristics of high temperature vulcanized silicon rubber at high altitude

Cited by 12 publications

References 20 publications

Surface potential decay and DC surface flashover characteristics of DBD plasma-treated silicone rubber

Surface potential decay and DC surface flashover characteristics of DBD plasma-treated silicone rubber

The microwave-absorption properties and mechanism of phenyl silicone rubber/CIPs/graphene composites after thermal-aging in an elevated temperature

Progress in research on the safety of silicone rubber products in food processing

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