Microstructure changes of polyimide/MMT-AlN composite hybrid films under corona aging
Microstructure changes of polyimide/MMT-AlN composite hybrid films under corona aging
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DOI：
10.1016/j.apsusc.2012.09.048
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发表时间：
2012-12
影响因子：
6.7
通讯作者：
Minghua Chen;Jinghua Yin;Wenbin Bu;Xiaoxu Liu;B. Su;Q. Lei
中科院分区：
文献类型：
--
作者：
Minghua Chen;Jinghua Yin;Wenbin Bu;Xiaoxu Liu;B. Su;Q. Lei
提出了一种利用蒙脱土-氮化铝（MMT-AlN）复合粒子作为聚酰亚胺（PI）掺杂剂的新方法。由于蒙脱土的层状结构和氮化铝的球状结构，我们选择MMT-AlN作为PI的掺杂剂，希望这种微米和纳米粒子的混合可以提高PI的耐电晕老化性能。电晕老化实验结果证实了该方法的正确性，掺杂量为7%的PI/MMT-AlN薄膜的电晕老化时间比纯PI薄膜延长了40倍以上。采用多种表面分析技术研究了PI/MMT-AlN薄膜在电晕老化过程中的微观结构变化。分析结果表明，PI/MMT-AlN样品膜中质量分形和表面分形共存。在电晕老化过程中，在掺杂PI膜表面形成致密的MMT-AlN无机阻挡层被认为是提供对进一步电晕老化的保护的机制。
A novel method using montmorillonite-AlN (MMT-AlN) composite particles as dopants in polyimide (PI) has been proposed and tested. We choose MMT-AlN as dopants in PI for lamellar structure of MMT and globular structure of AlN and hope such mixed micro- and nano-particles can enhance PI's resistance to corona aging. Our corona aging test result has confirmed our method and a 7% doped PI/MMT-AlN film has corona aging time extended more than 40 times compared with pure PI film. The microstructure changes of PI/MMT-AlN films due to corona aging have been analyzed by multiple surface analysis techniques. The analysis result shows coexistence of mass fractal and surface fractal in the sample films of PI/MMT-AlN. A dense inorganic block layer of MMT-AlN formed on the surface of doped PI films during corona aging is believed to be the mechanism of providing the protection against further corona aging.