聚酰亚胺
材料科学
电介质
聚合物
灵活性(工程)
多孔性
复合材料
化学工程
热稳定性
图层(电子)
光电子学
数学
统计
工程类
作者
Marcos Pantoja,Nicholas R. Boynton,Kevin A. Cavicchi,Bushara Dosa,Jessica L. Cashman,Mary Ann B. Meador
标识
DOI:10.1021/acsami.8b20420
摘要
Polyimide aerogels are mechanically strong porous solids with high surface area, low density, and dielectric constants close to 1, making them ideal materials for use as substrates for lightweight antennas. Increasing the flexibility of the polyimide aerogels extends the usefulness for conformal antennas for use on small aircraft such as unmanned air vehicles or personal air mobility vehicles. To this end, polyimide aerogels made with aromatic amines with 4-10 methylene units as flexible spacers between aromatic rings in the backbone have been fabricated. Substituting 25-75 mol % of fully aromatic 2,2'-dimethylbenzidine with these flexible diamines increases the flexibility of polyimide aerogels, making them bendable at thicknesses up to 2-3 mm. The density, dielectric constants, thermal and moisture stability, and mechanical properties of these aerogels were assessed to understand the effect of the amount and length of the methylene spacers on these properties.
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