Photoinduced optical anisotropy in new poly(amide imide)s with azobenzene units

Photoinduced Holographic Gratings in Azobenzene-Functionalized Poly(amideimide)s

“…The chemical structures of the investigated polymers are shown in Figure 1. Polymers PI 1-PI 3 have been reported previously, 25 however, the diffraction gratings formation in these polymers have not been studied yet. The poly(amideimide)s PI 4 and PI 5 are novel and were prepared from new synthesized dianhydride containing azobenzene group (DA).…”

“…Detailed synthesis and characterization of the poly(amideimide)s PI 1-PI 3 ( Figure 1) have been reported previously. 25 Poly-(amideimide)s PI 4 and PI 5 ( Figure 1) are new and were prepared from the newly synthesized diamidedianhydride (DA) and 4,4 0 -methylenedianiline and 4,4 0 -methylene bis(2,6-dimethylaniline), respectively. The monomer DA was prepared as reported in our previous paper for different dianhydrides (Scheme 1).…”

“…23,24 In a recent few years our research has been focused on the study of the influence of the chemical structure of azobenzene functionalized polyimides on photoinduced dichroism and birefringence both related with diffraction grating inscription. [25][26][27][28][29][30][31] This work is part of a continuing study of the relationship between polyimide structure and their photoinduced properties. In present paper we investigated the formation of diffraction gratings in new synthesized azobenzene functionalized poly(amideimide)s. Their azobenzene group is identical, but there are differences in the main chain architecture.…”

Novel Poly(esterimide)s Containing a Push-Pull Type Azobenzene Moiety-Synthesis, Characterization and Optical Properties

“…The absorption maximum in the polymer film was shifted to shorter wavelength in comparison to that in solution (about 17-28 nm), indicating H-type aggregation of azobenzene chromophores in the film, similarly to what was observed for others azopolymers. 10,39 The polymer films exhibited similar energy gap (E G ) (cf. approximation of ð Á EÞ 1=2 ¼ fðEÞ dependence (known as Tauc relation).…”

Electroactive Azo Polyamide Based Oligoaniline: Synthesis and Characterization

“…Among conductive polymers, polyaniline (PANI) is remarkable for its excellent environmental stability, 3 and unique in the ease with which its properties may be tuned by changes in oxidation state 4 or in degree of protonation. 5 Incorporation of a well-define oligoaniline into azo polyamide [6][7][8] leads to polymers not only with photoactivity but also with electroactivity.…”