长波紫外照射下高温硫化硅橡胶的微观物性及憎水性研究

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Abstract With the wide application of high temperature vulcanization silicone rubber(HTV) composite insulators for ultra-high voltage transmission in high altitude area,it is urgent to study the aging properties of HTV silicone rubber. The adjustable ultraviolet aging experimental box designed by ourselves is used for the accelerated aging experiment of HTV silicone rubber,and the wavelength of radiation light ranges from 320nm to 750nm. The measure of static contact angle is used to evaluate the hydrophobicity. Scanning electron microscopy(SEM),fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS) are carried out to study the microscopic properties and further investigated the change mechanism of hydrophobicity. The result shows that static contact angles and hydrophobicity have decreased after long-wave ultraviolet radiation. The reasons are that long-wave ultraviolet radiation breaks Si-C bonds which are on both sides Si-O main chains with symmetrical arrangement,methyl groups are oxidized on the side chains,which lead that the shield of strongly polar of Si-O bonds is abated,the polar of macromolecular chains enhance,and hydrophilic groups(-COOH) increased. In addition,some Si-C bonds are cut off by ultraviolet irradiation,new free radicals are appeared and further crosslinked or oxidized,which lead to many voids are generated,fillers exposed and flatness declined on the surface of HTV silicone rubber. These are also the reasons that hydrophobicity is reduced.

Key words： High temperature vulcanization(HTV) silicone rubber long-wave ultraviolet radiation micros copic properties hydrophobicity SEM FTIR XPS

Received: 14 August 2012 Published: 22 January 2015

PACS:	TM85
	TM215.2

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	Articles by authors
	Qin Yongxiong
	Yu Lan
	Fu Jia
	Li Guofang
	Wang Yong
	Guo Wenyi
	Du Xiaoli
	Liang Ying

Cite this article:

Qin Yongxiong,Yu Lan,Fu Jia等. Research on Microscopic Properties and Hydrophobicity of High Temperature Vulcanization Silicone Rubber under Long-Wave Ultraviolet Radiation[J]. Transactions of China Electrotechnical Society, 2014, 29(12): 242-250.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I12/242

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