Preparation of organo‐soluble co‐polyimides using N‐methyl‐2‐pyrrolidone as the solvent via one‐pot high‐temperature polymerization

Abstract

A series of organo‐soluble co‐polyimides (co‐PIs) were successfully synthesized from 3,3′,4,4′‐benzophenonetetracarboxylic‐dianhydride (BTDA), 1,4‐bis‐(4‐amino‐2‐trifluoromethyl‐phemoxy)‐benzene (p‐6FAPB) and 2‐(4‐aminophenyl)‐5‐aminobenzimidazole (BIA) via the one‐pot high‐temperature polymerization using N‐methyl‐2‐pyrrolidone (NMP) as the solvent. The imidization reaction of poly(amic acid)s in solution state was discussed in detail by attenuated total reflectance‐Fourier transform infrared spectra (ATR‐FTIR), and the results illustrate that the introduced benzimidazole moiety has a catalytic activity on the imidization process. The number‐average molecular weights and polydispersity index of these PIs measured by gel permeation chromatography range from 1.11 × 105 to 2.20 × 105 and 1.82 to 3.84, respectively. The prepared co‐PIs exhibit sufficient solubility in some polar solvents and high optical transparency. Meanwhile, these co‐PI films show good mechanical performances, and the strength and modulus of the sample with the molar ratio of p‐6FAPB/BIA = 5/5 reach 183 MPa and 4.71 GPa, respectively. Moreover, the obtained co‐PIs possess high glass transition temperatures (Tg) (above 260 °C) and good thermal stability with 5% weight loss temperature in the range of 502–531 °C in the nitrogen atmosphere. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45497.

Preparation and characterization of transparent polyetherketone

“…25 PI is a flexible transparent polymer with good high-temperature stability, excellent transparency, and excellent insulation, [26][27][28] which has been widely used in optoelectronic and microelectronic fabrications. [29][30][31][32][33] However, PI has a strong hygroscopicity. 34,35 The introduction of alicyclic structures, 36,37 bulky substituents, 38,39 asymmetric and rigid non-coplanar structures, [40][41][42] and inorganic nanoparticles 43,44 into polymer backbones could improve their transmittance, because such structures can effectively disrupt the regularity of molecular chains, giving the material body an amorphous or low crystallinity character.…”