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Water diffusivity transition in fumed silica-filled polydimethylsiloxane composite: Correlation with the interfacial free volumes characterized by positron annihilation lifetime spectroscopy

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Abstract

Fumed silica (FS)-filled polydimethylsiloxane (PDMS) composite is widely used as the external insulating material in power grid. The function of PDMS composite is to keep the core of an insulation device being dry by preventing the permeation of outside water. To study water diffusion in PDMS composite helps to shed light upon the failure mechanism of the insulation devices. In this paper, positron annihilation lifetime spectroscopy (PALS) and electrochemical impedance spectroscopy (EIS) were applied to study the FS/PDMS interface structure and water diffusion in PDMS composite. It is found that the FS has two basic existing states in PDMS matrix: dispersed state and percolated state, and the percolation threshold of FS is fitted to be 6.0 wt.%. In the dispersed state, the FS particles are randomly dispersed in PDMS matrix. The values of \(\tau _3\) remain stable, being approximately 1.0 ns, indicating no overlaps of the FS/PDMS interfaces. Moreover, water cannot diffuse through the sample after corona aging. In the percolated state, the FS particles are tightly packed in the PDMS matrix. The values of \(\tau _3\) decrease with the weight fraction of FS, suggesting the overlapping of the FS/PDMS interfaces. As the FS percolates in sample bulk, these overlapped FS/PDMS interfaces provide continuous diffusion tunnels for water, thus resulting in failure of the composite after corona aging. It is found that polarization and discharge of the electrons at FS/PDMS interface under corona discharge is the main mechanism that leads to the failure of the composite bulk.

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2019YFA0210003), the Science and Technology Project of China Southern Power Grid Co., Ltd. (No. GDKJXM20200403), and open fund of the Guangdong Key Laboratory of Electric Power Equipment Reliability in 2020 (No. GDDKY2020KF01).

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Authors and Affiliations

  1. Department of Physics and Hubei Nuclear-Solid Physics Key Laboratory, Wuhan University, Wuhan, 430072, China

    Zheng Wang, Yue Yang, Libing Qian, Chunqing He & Pengfei Fang

  2. Guangdong Key Laboratory of Electric Power Equipment Reliability, Electric Power Research Institute of Guangdong Power Grid Co.,Ltd, Guangzhou, 510080, China

    Zheng Wang, Xiangyang Peng & Zhen Huang

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  1. Zheng Wang
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Correspondence to Xiangyang Peng, Chunqing He or Pengfei Fang.

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Wang, Z., Yang, Y., Peng, X. et al. Water diffusivity transition in fumed silica-filled polydimethylsiloxane composite: Correlation with the interfacial free volumes characterized by positron annihilation lifetime spectroscopy. J Mater Sci 56, 3095–3110 (2021). https://doi.org/10.1007/s10853-020-05465-x

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