New Soluble Polyimides with High Optical Transparency and Light Color Containing Pendant Trifluoromethyl and Methyl Groups

Investigation of thermal and fluorescent properties of benzoxazole-linked triphenylamine-based co-polyimides

A series of novel fluorescent co-polyimides are obtained by combining N 1-(4-aminophenyl)- N 1-(4-(benzo[ d]oxazol-2-yl) phenyl) benzene-1,4-diamine and 4,4′-oxydianiline with four aromatic anhydride, 3,3′,4,4′-benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, 4,4′-oxydiphthalic anhydride, and 4,4 ′-(hexafluoroisopropylidene)diphthalic anhydride following conventional polycondensation method. The resultant co-polyimides are characterized by elemental, Fourier transform infrared spectral analysis and gel permeation chromatography. All newly prepared polyimides (PIs) exhibit shallow highest occupied molecular orbital energy levels in the range of −4.47 to −4.98 eV and have reasonable optical bandgaps. The photoluminescence spectral analysis shows blue to green emission in solution form. Thermal and solubility properties reveal that the PIs with pendant 4-(benzo[ d]oxazol-2-yl group linked to triphenylamine unit in polymer backbone impart not only good thermal stability but also appreciable solubility making these new co-polyimides versatile for multipurpose usage.

Influence of terminating triamine by phthalic anhydride on polyimides’ properties

In this study, hyperbranched polyimides were prepared from 2,6-bis(4-aminophenyl)-4-(4-(4-aminophenoxy)phenyl)pyridine (BAAP) and commercial dianhydrides by strictly controlling the reaction conditions. Polyimides with phthalimide pendants were also prepared to study the influence mechanisms of terminating BAAP by phthalic anhydride (PA) on polyimides’ properties. Fourier transform infrared and proton nuclear magnetic resonance spectroscopies were utilized to observe the chemical structures of the hyperbranched polyimides. The influence of terminating BAAP by PA on polyimides’ properties was studied by comparing the two series of polyimides. All the polyimide samples held completely amorphous structures and possessed excellent solubility and thermal stability. Terminating BAAP by PA decreased the d-spacing values of the obtained polyimides and slightly weakened their solubility and thermal stability.

Synthesis and characterization of blue light emitting redox-active polyimides bearing a noncoplanar fused carbazole–triphenylamine unit

Photoactive organosoluble polyimides containing a fused triphenylamine–carbazole group were synthesized. These polyimides demonstrated significant potential for optoelectronic devices.

Solubility prediction of supercritical carbon dioxide in 10 polymers using radial basis function artificial neural network based on chaotic self-adaptive particle swarm optimization and K-harmonic means

Excellent prediction modeling of CO₂ solubility in polymers using hybrid computation algorithm.