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Über die Kinetik der Reaktion von Hexamethylendiisocyanat mit 2-ethyl-1,3-hexandiol in verschiedenen Lösungsmitteln

✍ Scribed by Hager, Wilhelm ;Ueberreiter, Kurt


Publisher
Wiley (John Wiley & Sons)
Year
1979
Weight
412 KB
Volume
180
Category
Article
ISSN
0025-116X

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✦ Synopsis


Abstract

The kinetics of the polyaddition reaction of hexamethylenediisocyanate with 2‐ethyl‐1,3‐hexanediol were investigated in various aprotic solvents with zero dipole moment. The reactions were followed by means of IR‐spectroscopy. The reaction is of 2nd order. Rate constants depend on the dielectric constants of solvents. Energy of activation does not depend on the nature of the solvent, its value for the first isocyanate group is 28,97 kJ/mol and 17,79 kJ/mol for the second one. It is surprising that the consecutive reaction of the second isocyanate group is faster than that of the first one, if the diol is 2‐ethyl‐1,3‐hexanediol. This has not been found before. It could be shown that in the addition reaction of the same isocyanate with 2‐methyl‐2,4‐pentanediol the reactivity of the second isocyanate group is much smaller than that of the first one, as has been found with other dioles investigated until now.


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