Synthesis and properties of novel benzobisthiazole-containing hyperbranched polyamides derived from 2,6-diaminobenzo[1,2-d:4,5-d']bisthiazole

In this article, two novel benzobisthiazole-containing hyperbranched polyamides with different end groups were synthesized, by adjusting the feed molar ratio of the reaction monomers, using 1,3,5-benzenetricarboxylic acid and 2,6-diaminobenzo[1,2-d:4,5-d']bisthiazole as monomers, polyphosphoric acid as solvent, and catalyst. The molecular structure of the synthesized hyperbranched polymers were speculated by H-1-nuclear magnetic resonance (NMR) analysis, C-13-NMR analysis, and Fourier transform infrared analysis. The M-n, M-w, and DB of the carboxyl terminated polymer HB-COOH are 3264 g/mol, 3350 g/mol, and 44.1%, respectively, with a polydispersity of 1.03. The M-n, M-w, and DB of amino terminated polymer HB-NH2 are 3340 g/mol, 3420 g/mol, and 41.7%, respectively, with a polydispersity of 1.02. The thermal stability of HB-NH2 was higher than HB-COOH in the range of 30 degrees C-800 degrees C.These two benzobisthiazole-containing hyperbranched polyamides were completely amorphous and soluble in DMSO. Their DMSO solutions exhibited strong blue fluorescence. The fluorescent intensity of HB-NH2 was higher than HB-COOH. The prepared polymers were potential useful in the area of blue light emitting and display. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43453.