Structure to Properties Relations of Polyimide Foams Derived from Various Dianhydride Components

This work focuses on the influence of chain structure on properties such as the structural, thermal, morphological, and mechanical properties of polyimide foams (PIFs) which were prepared by polyester ammonium salt powder foaming process. Results showed that the melt viscosity of PEAS is affected by the structure of dianhydrides, which can greatly determine the foaming process, cell structure, and final properties of PIFs. PIF which was derived from 3,3',4,4'-benzophenonetetracarboxylic dianhydride and 4,4'-diaminodiphenylmethane exhibited the highest compressive strength (0.374 MPa-RT, 0.194 MPa-200 degrees C) and compressive modulus (9.24 MPa-RT, 7.37 MPa-200 degrees C). All PIFs exhibited excellent thermal stability as the initial thermal decomposition temperature reached as high as 544 degrees C. In addition, the thermal conductivity of the as-prepared PIFs fell in a range of 38-42 mW m(-1)K(-1), which show potential applications in areas of aerospace, aeronautics, marine use, and transportation among others.

Automated summary

This study focuses on the influence of chain structure on the properties of polyimide foams, highlighting the importance of different chain structures in determining the mechanical, thermal, and morphological properties of the foams. Specifically, polyimide foams derived from certain dianhydrides and diamines exhibit the highest compressive strength and thermal stability, indicating potential applications in aerospace, aeronautics, marine use, and transportation.