Comparison of pyridine-based polyimide/silica nano composites in some approaches: solution blending, ultrasonic, traditional and modern sol-gel methods

In the last decades, thermally stable polymers have received extensive interest due to the increasing demands for high temperature polymers as replacements for metals or ceramicsin automotive, aerospace, and microelectronic industries. Polyimides are certainly the most successful classes of hightemperature polymers [1-3]. Structure modification of these polymers could offer unique collection of properties. On top of that, Organic/inorganic composite materials combine the advantages of the organic polymer (e.g., flexibility, dielectric, ductility, and processability) and the inorganic material (e.g.,rigidity, thermal stability), among which SiO2 is viewed as being very important for physical, thermal, mechanical, andeven electrical properties. Therefore, researchers have invented and prepared polyimide/silica nano composites in a variety range of methods