Synthesis and Characterization of Polyimides with Naphthalene Ring Structure Introduced in the Main Chain

In this paper, a new aromatic diamine monomer 4,4 '-(2,6-naphthalenediyl)bis[benzenamine]) (NADA) was synthesized and a series of modified PI films containing naphthalene ring structure obtained by controlling the molar ratio of NADA monomer, ternary polymerization with 4,4 '-oxydianiline (ODA), and pyromellitic dianhydride (PMDA). The effects of the introduction of the naphthalene ring on the free volume and various properties of PI were investigated by molecular dynamic simulations. The results show that the comprehensive properties of the modified films are all improved to some extent, with 5% thermal weight loss temperature (T-d5%) of 569 degrees C, glass transition temperature (Tg) of 381 degrees C, tensile strength of 96.41 MPa, and modulus of elasticity of 2.45 GPa. Dielectric property test results show that the dielectric constant (Dk) of the film at 1 MHz is reduced from 3.21 to 2.82 and dielectric loss (Df) reduced from 0.0091 to 0.0065. It is noteworthy that the PI-1 dielectric constant is reduced from 3.26 to 3.01 at 10 GHz with only 5% NADA doping, which is expected to yield the best ratio and provide the possibility of industrial production.

Automated summary

A new aromatic diamine monomer NADA was synthesized and a series of modified PI films containing naphthalene ring structure were obtained. The introduction of the naphthalene ring was found to improve the comprehensive properties of the modified films.