Low dielectric and thermal properties of polyimides based on PMDA, BPADA, TPE-Q and TPE-R

Abstract

The polyimides were prepared by pyromellitic dianhydride (PMDA) or 4,4'-(4,4'-Isopropylidenediphenoxy)diphthalic anhydride (BPADA) as dianhydride monomer and 1,4-bis(4-aminophenoxy)benzene(TPE-Q) or 1,3-bis(4-aminophenoxy)benzene(TPE-R) as diamine monomer. The polyimides were well characterized by FT-IR, thermogravimetric analysis, dynamic thermomechanical analysis, dielectric measurement and tensile test. The flexibility of polyimide molecular chain was judged by the comparison of molecular volumes, molecular length and conformation transition energy through molecular simulations.

Graphical Abstract

Keywords:

• Molecular simulation
• polyimides
• dielectric property
• thermal property

Acknowledgement

Guorong Qiu thanks Professor Ma for his funds to support this research.