Preparation of polyimide films via microwave-assisted thermal imidization

Abstract

A series of polyimide films were prepared via a microwave-assisted thermal imidization and conventional thermal imidization method at different temperatures.

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

“…Several studies compared the classical, thermal-, and microwave-assisted polycondensation procedures applied on the same common starting compounds in terms of order degree within polymeric backbones, imidization level, thermal and mechanical properties of resulting films. Microwaves assured a higher order level of the final products and proved to be more efficient and, of course, faster in reaching imidization [115,122]. The imidization degree attained by microwaves was double the size of the one obtained by common thermal cyclization at 200°C and was almost complete at 250°C.…”

“…The imidization degree attained by microwaves was double the size of the one obtained by common thermal cyclization at 200°C and was almost complete at 250°C. Moreover, the PIs obtained by microwaves displayed higher thermal stability and superior mechanical resilience (even up to 30% higher) as compared to their thermally imidized counterparts [115,117,127].…”

“…The main advantages of using microwaves in the synthesis of PIs are the rapid completion of polycondensation, high purity of final products, uniform temperature rise, and overall greener energy balance. Some small drawbacks refer to the less accessible upscale and the need to re-dissolve the final product to prepare PI films or membranes [115,116].…”

Design and fabrication of photoactive imidazole-based poly(ether-imide)s and a polyimide/HBP-modified SiO2 composite: toward high heat-resistance, antimicrobial activity and removal of heavy metal ions

“…Then, H 2 SO 4 was transferred to the solution as a catalyst and placed at 80 C. Aer passing 3 h, the mixture was cooled and precipitated in distilled water. The formed product was accumulated by ltration and dried in an oven at 90 C. Yield 13 3 Hz, 2H, Ar-H), 12.36 (s, 1H, NH imidazole). 13…”

“…[9][10][11] One of the most progressive categories of great performance polymeric materials is aromatic polyimides (PIs), owing to their prominent properties such as robust chemical resistance, outstanding thermal stability, relatively small dielectric permittivity, prominent mechanical fortication, supreme electrical attributes, etc. [12][13][14][15] Also, as matrices, they are oen considered the appropriate choice for preparing polymeric nanocomposites. [16][17][18][19] PIs have engendered signicant consideration for diverse applications such as functional membranes, gas separation, aerospace industry, and interlayer dielectrics (ILD) in electronic devices.…”