二维水滑石纳米片对氧化铝/聚酰亚胺复合薄膜耐电晕性能的影响

将二维层状材料水滑石剥离为二维纳米片分散液,向其中加入纳米氧化铝,并进行聚酰亚胺(PI)的原位聚合,构筑PI/水滑石纳米片/氧化铝纳米粒子三元复合薄膜。 结果表明,在PI薄膜中同时加入质量分数为10%氧化铝和2%水滑石纳米片,比仅加入质量分数为10%氧化铝时的耐电晕时间(180 min)提高了12倍,拉伸强度提高了37.8%。 聚合物中同时加入纳米片、纳米粒子两种不同形貌填料,能够同时提升复合材料的耐电晕性能和机械性能。

Improved Corona-Resistance Properties of Alumina/Polyimide Films with Exfoliated Layered Double Hydroxide Nanosheets

Incorporation of inorganic nanoparticles to polyimides is an important strategy to improve corona resistance. The improvement of corona-resistant characteristics is closely related to the dispersion of nano fillers. The controllable distribution of nanoparticles in polymer matrix has always been a challenge. In this paper, The Al₂O₃/polyimide(PI) composites were synthesised via in situ polymerization in the solution of two-dimensional nano-sheets exfoliated from layered double hydroxides (LDH). In the process of the film formation, the two-dimensional nano-sheets tend to aggregate and orientate towards the substrates with the solvent volatilization, which would affect the distribution of Al₂O₃ in the polymer matrix, and furthermore improve the corona resistance of the Al₂O₃/LDH/PI composites. The corona resistance time of Al₂O₃/LDH/PI composites is 180 min, and improves by twelve-fold when 2% (mass fraction) LDH is added into 10% (mass fraction) Al₂O₃/PI composites, and the tensile strength increases by 37.8%. Due to the different morphologies, the combination of two-dimensional nanosheets and nanoparticles can effectively improve the corona resistance and mechanical properties of Al₂O₃/LDH/PI composite films.