Synthesis and characterization of polyamides derived from (4-(4-(2, 6-diphenylpyridin-4yl)phenoxy)phenyl)-3, 5-diaminobezamide
- 73 Downloads
New types of polyamides containing pendent triaryl pyridine groups were successfully synthesized by direct polycondensation of a symmetry diamine, (4-(4-(2,6-diphenylpyridin-4yl)phenoxy)phenyl)-3,5-diaminobezamide (DPDAB), and various aromatic and aliphatic dicarboxylic diacids in NMP using triphenyl phosphate (TPP) and pyridine as catalyst. The diamine and all the prepared polyamides were fully characterized by using FT-IR, 1H-NMR, UV-Vis spectroscopy, fluorimetry and elemental analysis. The inherent viscosity of polyamides ranged from 0.45 dL/g to 0.68 dL/g. All the polymers exhibited solubility in common polar aprotic solvents such as NMP, DMAc, DMF, DMSO, pyridine, HMPA, and even in less polar solvents such as THF and m-cresol at room temperature. Thermal properties of polyamides were evaluated by means of DSC, DMTA and TGA. These polymers showed glass transition temperatures (Tg) in the range of 138–210°C. Their initial decomposition temperature (Ti) varied from 265°C to 310°C under N2. The dilute solution (0.2 g/dL) of polyamides in DMF exhibited fluorescence emission with λmax in the range of 470–550 nm.
KeywordsPolyamides Synthesis Direct polycondensation Solubility Thermal stability
Unable to display preview. Download preview PDF.
- 1.Yang, H.H., “Aromatic high-strength fibers”, Wiley, New York, 1989, p. 10Google Scholar
- 2.Cassidy, P.E., “Thermally stable polymers”, Marcel Dekker, New York Inc, 1980, p. 27Google Scholar
- 3.Frazer, A.H., “High temperature resistant polymers”, Wiley, New York, 1968, p. 17Google Scholar
- 10.Imai, Y., Malder, N.N. and Kakimoto, M., J. Polym. Sci. Part A: 1984, 22: 2189Google Scholar
- 27.Yamazaki, N., Matsumoto, M. and Higashi, F., J. Polym. Sci. Part A, 1975, 13: 1373Google Scholar