| 초록 |
Because of their unique three-dimensional cellular structure, aerogels possess high porosity, high surface area, and very low density, resulting in the various application in mechanical, heat, and electrical fields. Conventional inorganic aerogels exhibit poor mechanical properties and their uses are limited. In order 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 through the freeze-drying method by using crosslinking agents, such as silica nanoparticles and carbon nanotubes (CNT). These materials can act as effective crosslinking agents for polymer aerogels, which can impart low shrinkage and high porosity as well as improved mechanical properties of aerogels. 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. |
