Synthesis of poly(urethane)s based on diphenyl‐silane/germane and oxyphenyl units: Structure–properties relationship |
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Authors: | A Tundidor‐Camba C A Terraza L H Tagle D Coll P Ortiz |
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Affiliation: | Organic Chemistry Department, Faculty of Chemistry, Pontificia Universidad Católica de Chile, Correo 22, Santiago, Chile |
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Abstract: | A series of poly(urethane)s (PUs) based on diphenyl‐silane or ‐germane and oxyphenyl units were synthesized by polycondesation of 4‐4‐9‐4‐(4‐aminophenoxy)‐3‐methyl‐phenyl]fluoren‐9‐yl]‐2‐methyl‐phenoxy]aniline (3) and four bis(chloroformate)s ( I–IV ). These monomers were prepared and characterized in previous works. The best conditions for the polymerization reactions were investigated by a kinetic study. Also, a selection of the best solvent for the reaction was developed. Polymers were characterized by IR and 1H, 13C, and 29Si‐NMR spectroscopy and the results were in agreement with the proposed structures. Poly(urethane)s showed inherent viscosity values between 0.12 and 0.31 dL/g, indicative of low molecular weight species, probably of oligomeric nature. The glass transition temperature (Tg) values were observed in the 127–168°C range by DSC analysis. Thermal decomposition temperature (TDT10%) values were above 300°C. All PUs showed good transparency in the visible region (>80% at 350 nm) due to the incorporation of the bulky monomer (fluorene) and oxyether linkages. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 |
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Keywords: | silicon‐containing polymers poly(urethane)s bis(chloroformate) glass transition temperature thermogravimetric analysis |
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