Preparation and properties of polyimide composite aerogels for piezoresistive sensor
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초록
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Because of their unique three-dimensional cellular structure, aerogels possess high porosity, high surface area, and ultra-low density, resulting in the wide application in mechanical, heat, and electrical fields. Conventional inorganic aerogels exhibit poor mechanical properties and their uses are limited. To overcome these difficulties, organic aerogels such as polyimide (PI) aerogels having excellent mechanical properties and high thermal stability are drawing attention. In this work, PI composite aerogels were prepared by adding 1,3,5-benzene tricarbonyl trichloride (BTC) and carbon nanotubes (CNT) through the freeze-drying method. The electrical and mechanical properties vary depending on the added materials, and it is possible to be used as pressure sensors suitable for various environments through the improvement of gauge factor (GF) and sensitivity (S). The mechanical properties of PI composite aerogels were examined by SEM, UTM, and TGA, and the electrical analysis was conducted with the content of CNT.