为提高绝缘材料表面的憎水性,采用在Ar/SiCl4中产生稳定的大气压等离子体射流放电对典型绝缘材料环氧板表面进行憎水性改性,通过接触角测量、表面能计算以及扫描电子显微镜(SEM)等对改性前后的环氧表面特性进行研究,探索接触角和表面能随处理时间的变化规律,并结合光谱诊断对改性机制进行了分析.结果表明:改性处理后,环氧表面形成一层致密的网状结构,表面引入了含硅基团,表面极性降低,因此表面水接触角增加,表面能降低,憎水性增强.当处理时间为180 s时,环氧表面的憎水性改性效果最好,表面水接触角由46°提高到最大值91°.
To improve the surface hydrophobicity of insulating material, a stable jet discharge generated in Ar/SiCl4 at atmospheric pressure was used to treat the surface of epoxy resin, and the surface properties before and after treatment were analyzed by contact angle measurement, surface energy calculation, and scanning electronic microscope (SEM). The variation of contact angle and surface energy with treatment time were studied, and the modification mechanism was discussed based on emission spectral diagnosis. The results show that a layer of dense mesh structure is formed on the surface of epoxy resin after treatment. The silicon-containing groups are introduced into the surface, leading to the surface polarity decrease, thus the water contact angle increases, the surface energy decreases, and the surface hydrophobicity is improved. When the treatment time is 180 s, the modification effect of hydrophobicity is the best, and the water contact angle increases from 46° to the maximum value of 91°.
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