Synthesis of Conjugated Hyperbranched Polytriazoles Containing Truxene Units by Click Polymerization

It has been a challenge to synthesize high molecular weight and soluble conjugated hyperbranched poly(1,2,3-triazole)s (hb-PTAs). In this paper a series of soluble hyperbranched polytriazoles, whose number-average molecular weight (Mn) and polydispersity index ranged in (1.23.3) x 10(4) and 1.73.0, respectively, were synthesized with A2+B3 approach. In the polymerization process, diazides A1A4 and triyne B1 were used as A2 and B3 monomers; Cu(I)-catalyst, THF and water were used as their reaction system. At room temperature 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 (14). The polymers were soluble in common organic solvents, and all emitted blue light; the films of polymers emitted yellow and blue light, 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).