Synthesis Of Conjugated Hyperbranched Polytriazoles By Click Polymerization

Recently,conjugated polymers containing Truxene and fluorene units have attracted widespread interest in the field of polymer owing to their effective blue light-emitting.Hyperbranched polytriazoles are more and more used to the field of polymer,because their special properties and synthesis easily."Click"is a new and easy approach to synthesize conjugated polymers.So,hyperbranched polymers which are synthesized by―click"chemistry and contain Truxene and fluorene units have been widely investigated in conjugated polymer system.1. In this paper a series of conjugated polymers containing fluorene units were synthesized by"Click"chemistry. The monomers of N₃-Ar-N₃ and C≡C-Ar-C≡C were synthesized Starting from fluorone, the polymerization were carried out through Cu⁺ catalysis in solvent DMF and THF. High molecular weight polymers were easy obtained because of the introduction of easily soluble fluorene. Most polymer prepared"Click"chemistry were nonfluorescent in the solid state, because t the polymer luminescence was quenched by aggregated formation. The conjugated polymers containing fluorene units emitted blue light, furthermore the film of the polymer was fluorescent. To detect the influence caused by aggregation, the block films of the polymer and polystyrene (PS)were prepared by spin coating. The newly synthesized polymer was stable, The decomposition temperature is above 300℃. DSC result shows that linear polymer does not have an obvious phase transition under 300℃, indicating polymer form amorphous films, which help to improve the efficiency of PLEDs.2. It has been a challenge to synthesis high molecular and soluble conjugated hyperbranched poly(1,2,3-triazole)s(hb-PTAS). In this paper a series of soluble hyperbranched polytriazoles, the number-average molecular weight (Mn) and polydispersity index ranged in (1.2-3.3)×10⁴ and 1.7-3.0, respectively were synthesized with A₂+B₃ aproach. In the polymerization process, diazides A1-A4 and triyne B1 were used as A₂ and B₃ monomers, Cu+-catalyzed, THF and water were used as their reaction system. At room temperature reaction, the final molecular weight could be controlled through reaction time, so finally we obtained soluble conjugated hyperbranched poly(1,2,3-triazole)s hb-PTAS(1-4). the polymer were soluble in common organic solvents, and all emitted blue light; the films of polymersemitted yellow and blue light, respectively, due to the difference in the aggregation of their chromophoric units in the solid state. The thermal properties of the final copolymers were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).