Abstract: An oligo(phenylene vinylene) with central biphenyl bridge and peripheral carbazole founctionalities was synthesized. The structure and purity were characterized by using ¹H NMR, MS and elementary analysis techniques. Thermal analysis data indicated that the obtained compound possessed both high chemical and morphological stability. The glass transition temperature was 142.05 ℃; the mass-loss temperature started at 306 ℃. The observed absorption features and X-ray diffraction patterns suggested an amorphous state of the spin-coating films, and the annealing treatment at 80 ℃ for 4 h did not change the amorphous property. The results above showed that the molecular design of introducing a central biphenyl bridge and bonding peripheral bulky carbazole functionalities can not only effectively decrease the aggregation of chromophores but also keep the stability of biphenyl bridged DSB derivatives.

Key words: Biphenyl bridge, Carbazole, Solid film, Thermal stability