Mechanical Properties of High Temperature Vulcanized Silicone Rubber Aged in the Natural Environment

Zhang, Zhijin; Zhao, Jiewen; Wan, Xiaohua; Jiang, Xingliang; Hu, Jianlin

doi:10.3390/polym14204439

Cited by 10 publications

(5 citation statements)

References 23 publications

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“…Then, some obvious aging behaviors, such as chalking and cracking, emerge on the material surface, which help guide site maintenance. The structural changes in this aging experiment are highly consistent with those observed in the aging of insulators in the field [37]. Besides, as discussed in mechanical properties, the elongation at break of HTV-SR eventually decreased by 24.1%.…”

Section: Comparison Between Artificial Aging and Natural Agingsupporting

confidence: 86%

Mechanism of Accelerated Deterioration of High-Temperature Vulcanized Silicone Rubber under Multi-Factor Aging Tests Considering Temperature Cycling

Zeng

Peng

et al. 2023

Polymers

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High-temperature vulcanized silicone rubber (HTV-SR) employed for composite insulators is continuously subjected to a complex environment of alternating heat, corona discharge, humidity, etc. These stresses (especially alternating heat) complicate the aging mechanism of HTV-SR, which lacks systematic investigation. In this paper, a multi-factor aging platform considering temperature cycling, moisture, and corona discharge is established. Specifically, four temperature-cycling settings are employed, each of which lasts for 15 cycles. The surface morphology, hydrophobicity, and chemical, mechanical, and electrical properties of aged samples are methodically characterized. Experimental results show that the aging degree is correlated to the range of temperature cycling, which is attributed to diverse crosslink-degradation degrees with different temperature differences. Under a large temperature difference (70 °C), HTV-SR possesses a high crosslinking degree and a low degradation degree, making the material hard but easy to crack with alternating thermal stress. Then, severe defects and water condensation emerge on the HTV-SR surface, which promote the diffusion of corona products and water molecules into the material. The subsequent rise in crosslinking density caused by in-depth oxidation further exacerbates the aging of the material. Consequently, it brings about poor hydrophobicity, high interfacial polarization, and shallow trap energy levels in HTV-SR. This work provides a detailed analysis of the aging mechanism of HTV-SR in a simulated on-site environment.

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Section: Comparison Between Artificial Aging and Natural Agingsupporting

confidence: 86%

Mechanism of Accelerated Deterioration of High-Temperature Vulcanized Silicone Rubber under Multi-Factor Aging Tests Considering Temperature Cycling

Zeng

Peng

et al. 2023

Polymers

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“…The first stage is the weight loss stage of aluminum hydroxide, and the main decomposition product is water. The weight loss in the second stage was mainly the thermal decomposition of PDMS [47]. Similar to the previous stage, the more serious the aging, the less PDMS available for pyrolysis.…”

Section: Chemical Composition Analysismentioning

confidence: 90%

Evaluation of aging and degradation for silicone rubber composite insulator based on machine learning

Liu

Yang

et al. 2023

J. Phys. D: Appl. Phys.

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Silicone rubbers, as the main material of composite insulator sheds, have aging phenomenon for the long-term operation in the outdoor, which has an important impact on the performance degradation of composite insulator. Periodic examine and replacement of severely aged composite insulator is of great significance for the safe operation of power system. However, there is no clear standard to estimate the aging degree. In order to evaluate the degree of aging and degradation more accurately, the experimental test and analysis of the silicone rubber sheds were carried out from three aspects: physical characteristics, chemical composition and electrical properties. The physical characteristic results show that the surface of the aging silicone rubber will appear obvious holes and cracks, as well as hardening. Chemical composition results show that the internal composition of the continuous decomposition, while a large number of heavy metal elements accumulate in the pollution. The change of physical characteristics and chemical composition of silicone rubber sheds may lead to the deterioration of electrical properties. According to the above results, the influence rule of measurement parameters and aging degree was obtained, and the key feature parameters of aging were summarized and extracted. Based on the feature parameters, a decision tree aging evaluation model is established for state evaluation. The accuracy of machine learning is 100% and 93.2% respectively. Furthermore, early warning of moderately aged insulators and replacement of severely aged insulators are proposed in the on-site maintenance of silicone rubber composite insulators.

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“…As of 2016, silicone rubber composite insulators accounted for more than 40% of China's outdoor insulators. However, silicone rubber is an organic insulating material with insufficient weather resistance [7,8]. The service life of silicone rubber composite insulators is generally only 10-20 years, which is much shorter than that of porcelain or glass insulators (up to 50 years or more).…”

Section: Introductionmentioning

confidence: 99%

Preparation and performance improvement of a dual‐component microcapsule self‐healing system for silicone rubber insulating material

Li,

Cao,

Yin

et al. 2023

High Voltage

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A key factor limiting the development of silicone rubber insulating materials is their short service life in harsh operating environments. The establishment of a self‐healing system is desired to improve the long‐term operational performance of silicone rubber and effectively extend its service life. In this study, poly(urea‐formaldehyde) microcapsules containing polydimethylsiloxane healing agents are prepared and a dual‐component microcapsule self‐healing system for silicone rubber material is established and optimised. In addition, the key factors affecting the self‐healing performance (such as microcapsule size, rupture rate, and microcapsule doping amount) are investigated. It is found that when SYLGARDTM 184 is used as the healing agent and matrix, with a 4:6 (A:B) doping ratio of dual‐component microcapsules and 20 phr doping amount, the self‐healing efficiency is approximately 51%. Furthermore, increasing the microcapsule rupture rate and the interface strength between the healing agent and the matrix can effectively improve the self‐healing performance. The relationships between key factors and self‐healing performance are theoretically revealed. Based on the relationships, the microcapsule self‐healing system can be appropriately designed. The results of this paper can provide a reference for the development of long‐life silicone rubber insulating materials.

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Mechanical Properties of High Temperature Vulcanized Silicone Rubber Aged in the Natural Environment

Cited by 10 publications

References 23 publications

Mechanism of Accelerated Deterioration of High-Temperature Vulcanized Silicone Rubber under Multi-Factor Aging Tests Considering Temperature Cycling

Mechanism of Accelerated Deterioration of High-Temperature Vulcanized Silicone Rubber under Multi-Factor Aging Tests Considering Temperature Cycling

Evaluation of aging and degradation for silicone rubber composite insulator based on machine learning

Preparation and performance improvement of a dual‐component microcapsule self‐healing system for silicone rubber insulating material

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