Synthesis and evaluation of photoluminescent and electrochemical properties of new aromatic polyamides and polyimides with a kink 1,2-phenylenediamine moiety

Preparation and properties of highly organosoluble polyimides derived from 2,2′-disubstituted-4,4′-oxydianilines

Four novel aromatic, symmetrical ether diamines (2,2′-bis(biphenyl)-4,4′-oxydianiline, 2,2′-bis[4′-(3″,4″,5″-trifluorophenyl)phenyl]-4,4′-oxydianiline, 2,2′-bis[4-(naphthalene-1-yl)phenyl]-4,4′-oxydianiline, and 2,2′-bis[4″-(diphenylamino)phenyl]-4,4′-oxydianiline), were successfully synthesized through four steps using p-chloronitrobenzene as a starting material. Highly organosoluble polyimides were obtained by the reaction of these diamines with 2′2 ′-bis[4′-(3″,4″,5″-trifluorophenyl)phenyl]-4,4′,5,5′-biphenyltetracarboxylic dianhydride via a conventional two-step chemical imidization method. All the polyimides were thoroughly characterized by Fourier transform infrared, ultraviolet, fluorescence, gel permeation chromatography, and thermogravimetric analysis. The effect of the fluorine atoms directly linked to the lateral phenyl rings showed excellent dissolution and strong fluorescence. The polyimides exhibited excellent thermal stability, with decomposition temperatures (at 10% weight loss) above 530°C and glass transition temperatures in the range of 258–320°C. These outstanding combined features ensured that these polyimides could be used as memory materials for advanced microelectronic applications.

4-quinolin-8-yloxy Linked Triphenylamine Based Polyimides: Blue Light Emissive and Potential Hole-Transport Materials

A series of fluorescent donor- acceptor (D-A) alternating copolyimides (P1, P2, P3 and P4) with 4-quinolin-8-yloxy linked triphenylamine main polymer chain have been synthesized by conventional polycondensation. All the synthesized co-polyimides were characterized by elemental, gel permeation chromatography and FTIR spectral analysis. These newly prepared PIs possess HOMO energy levels in range of - 4.74 to - 4.78 eV and have medium optical band gaps. The photoluminescence spectral analysis revealed blue to violet emission with appreciable efficiency with lower onset oxidation potentials suitable for the facile hole injection materials. All the photophysical and electrochemical properties were also explored in context of effect of the pendant 4- quinolin-8-yloxy, indicating suitable combination of donor (TPA) on one hand and imide and pendant as acceptor on both ends.Graphical Abstract.

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.

Phosphorus-containing polyimide fibers and their thermal properties

Submicron fibers based on phosphorus-containing polyimide were successfully prepared and characterized for their thermal properties.

Highly dispersible ternary composites with high transparency and ultra low dielectric constants based on hyperbranched polyimide with organosilane termini and cross-linked polyimide with silica

Flexible insulating materials that are both thermally and mechanically stable, highly transparent, and have low dielectric constants are highly desirable for electronic applications.