Synthesis and characterization of poly(pyridylurea) and poly(pyridylthiourea), potentially semiconducting polymers |
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| Authors: | F R Díaz A Godoy J Moreno J C Bernède M A Del Valle L H Tagle G A East |
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| Affiliation: | 1. Laboratorio de Polímeros, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Correo 6094411, Santiago, Chile;2. Docente Facultad Ciencias de la Salud, Universidad Diego Portales, Ejército 141, Santiago, Chile;3. Université de Nantes, G.P.S.E. Faculté des Sciences et des Techniques, 2 Rue de Houssinière, BP 92008, 44322 Nantes, Cedex 3, France;4. Instituto de Química, Universidade de Brasilia, Cx. P. 4478, CEP 70.919‐970, Brasilia, D.F. – Brasil |
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| Abstract: | Poly(pyridylureas) and poly(pyridylthioureas) were synthesized by reacting 2,6‐diaminopyridine with phosgene and thiophosgene, respectively, using THF and pyridine as solvent. The synthesized polymers were characterized by IR‐spectroscopy, elemental analysis, and X‐ray photoelectron spectroscopy. Thermal stability of the polymers was determined by thermal degradation between 35°C and 700°C. The 50% weight loss of polypyridylureas was above 400°C while for the polypyridylthioureas it was above 450°C. Undoped poly(pyridylureas) and poly(pyridylthioureas) behave as semiconductors, σ = 10?9 (Ω cm)?1. After doping with I2 and SbF5, the electrical conductivity increases several orders of magnitude, σ = 10?7(Ω cm)?1. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 |
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| Keywords: | poly(pyridylureas) poly(pyridylthioureas) semiconducting polymers |
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