Journal
POLYMER
Volume 43, Issue 10, Pages 2927-2935Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0032-3861(02)00071-X
Keywords
polyurethanes; poly(urethane-urea)s; ethylene carbonate
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A new method of the synthesis of aliphatic polyurethanes from diamines arid diols or alternatively from alpha,omega-aminoalcohols using ethylene carbonate as a substitute of phosgene is presented. It has been found that the transurethanisation reaction between alpha,omega-bis(2-hydroxyethoxycarbonylamino)alkanes and diols containing six or more carbon atoms in a molecule carried out in the presence of tin coordination catalysts, leads to [n,m]polyurethane, and ethylene glycol formed as a side-product. In the case of using aminoalcohols, the reaction with ethylene carbonate leads to [n]polyurethanes. The polymerisation products were analysed by means of H-1 and C-13 NMR spectroscopy, as well as MALDI-TOF mass spectrometry. The influence of the reaction conditions on the chemical structure of the reaction products and a plausible reaction mechanism are discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
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