K. Hiroki, Y. Ichikawa, H. Yamashita
May 19, 2008
Citations
0
Influential Citations
7
Citations
Journal
Macromolecular Rapid Communications
Abstract
A fluorene diol derivative, 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (1), reacted with diisocyanates such as 1,3-bis(isocyanatomethyl)cyclohexane (2a), 1,6-diisocyanatohexane (2b), and 1,3-bis(isocyanatomethyl)benzene (2c) under temperature-controlled microwave irradiation to form the corresponding polyurethanes with M w being 30 000 to 60 000, measured by GPC with reference to polystyrene standards within 5 to 10 min at 160 to 200°C. In the reactions of 2a and b, the molecular weights were 15 to 20 times higher than those obtained by conventional oil bath heating. For a solvent of the microwave-promoted reaction, a hydrocarbon compound, decalin, is preferably used to undergo the polymerization cleanly without unfavorable coloration and/or gelation.