Syntheses and properties of copolymers containing indolocarbazole moiety in the side chain

Abstract

Novel copolymers containing the indolo [3,2-b]carbazole (INC) moiety were synthesized, and the effects of the INC content on their physical properties were investigated. The homopolymer of the INC-containing monomer, 1-octyl-7-(4-vinylbenzyl) indolo [3,2-b]carbazole and copolymers with styrene were prepared by radical polymerization. Four kinds of copolymers with different compositions were obtained. The glass transition temperatures (Tgs) were observed in the range of 101-112 1C, and the decomposition temperatures were nearly 400 1C. The photonic properties of the copolymers were also evaluated in solution in tetrahydrofuran and for spin-coated films on a fused silica substrate. In the ultraviolet-visible absorption spectra, maximum absorption peaks were observed at 340-345 nm in both the solutions and the films. In the case of the solutions, the photoluminescence intensities of the copolymers increased with increasing INC monomer units in the copolymer. On the contrary, the photoluminescence intensities of the copolymer films decreased with increasing INC content in the copolymer, which is likely due to the concentration quenching caused by the condensation of intermolecular interactions derived from INC components. The copolymer with a low content of the INC moiety exhibited high emission and good film-forming ability.

Syntheses and Photonic Properties of Copolymers Containing Indolocarbazole Moiety in the Side Chain

“…The obtained copolymers were amorphous and exhibited high thermal stability according to the increase of INC content. These copolymers possessed the better film forming ability than styrene-type copolymers [7]. The thickness of copolymer films was controlled in the range of 0.22 -150 m by the spin-coating and solventcasting methods.…”

“…1-(4-Vinylbenzyl)-7-octylindolo[3,2-b]carbazole (VINC-C 8 ) was prepared according to the procedure described in the literature [7]. 2,2'-Azobis(isobutyronitrile) (AIBN) was purified by recrystallization from ethanol.…”

“…In the copolymerization, the composition, x/y, was controlled by changing the monomer ratio of VINC-C 8 and MMA to obtain two copolymers with different compositions. In our previous study [7], it was found that the increase of the INC content in the copolymer caused the concentration quenching due to the strong intermolecular interaction between the INC components. As a result, the photoluminescence intensities of the polymer films increased as the INC content decreased.…”

“…However, only few studies have been reported on the synthesis of INC-containing polymers. In our previous study [7][8][9], we have investigated the synthesis of a novel monomer containing indolocarbazole moiety, 1-(4-vinylbenzyl)-7-octylindolo[3,2-b]carbazole (VINC-C 8 ), and the copolymers of VINC-C 8 with styrene were prepared by a radical polymerization. Then, it was found that the obtained copolymers showed the amorphous state and the thermal stability of the copolymers increased as the INC content increased.…”

Synthesis of poly(acryl amide) containing indolo[3,2-<i>b</i>]carbazole moiety in the side chain

“…In our previous study, the preparations of several polymers containing INC moiety in the main chain or side chain were investigated and the thermal and photonic properties of these polymers were estimated [8][9][10][11][12]. 1-(4-vinylbenzyl)-7-octylindolo [3,2-b]carbazole (VINC-C8), and the copolymers of VINC-C8 with styrene or MMA were prepared by radical polymerizations, and the thermal and photonic properties were investigated.…”