Urethane reaction kinetics of butanediols catalyzed by Zr(acac)4

The urethane reaction of isocyanate was carried out with zirconium acetyl acetonate (Zr(acac)4) as catalyst. 1,2‐Butanediol and 1,4‐butanediol were used as model compounds to investigate the reaction kinetics. It was shown that hydroxyl groups in 1,2‐butanediol appeared to have different reaction ra...

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Bibliographic Details
Published in:Journal of applied polymer science 2013-09, Vol.129 (5), p.2399-2403
Main Authors: Yang, Peng Fei, Li, Tian Duo
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
kinetics
Materials science
Organic polymers
Physicochemistry of polymers
Polycondensation
Polymers
polyurethanes
Preparation, kinetics, thermodynamics, mechanism and catalysts
spectroscopy
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Summary:The urethane reaction of isocyanate was carried out with zirconium acetyl acetonate (Zr(acac)4) as catalyst. 1,2‐Butanediol and 1,4‐butanediol were used as model compounds to investigate the reaction kinetics. It was shown that hydroxyl groups in 1,2‐butanediol appeared to have different reaction rate when reacting with phenyl isocyanate, which was labeled as kfast and kslow. It was very surprising that the reaction rate of 1,4‐butanediol (kcon) was very similar to the value of kslow at the same temperature although there is only primary hydroxyl group in its molecule. Furthermore, activation energy (Ea), activation enthalpy (ΔH), and activation entropy (ΔS) for the reaction were calculated out, from which some catalytic properties of Zr(acac)4 were revealed. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
ISSN:0021-8995
1097-4628
DOI:10.1002/app.38978