Effects of Solvent Polarity on the Urethane Reaction of 1,2-Propanediol

Peng Fei Yang

doi:10.4028/www.scientific.net/AMR.450-451.38

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 450-451Effects of Solvent Polarity on the Urethane...

Effects of Solvent Polarity on the Urethane Reaction of 1,2-Propanediol

Abstract:

The urethane reaction kinetics of 1,2-propanediol with phenyl isocyanate are investigated in different solvents, such as xylene, toluene and dimethylformamide. In-situ FT-IR is used to monitor the reaction to work out rate constant. It showsthat the urethane reaction has been found to be a second order reaction, solvents largely affects reaction rates. The reaction is largely accelerated in polar solvents, following the order of dimethylformamide > toluene > xylene. Further more, when dimethylformamide is used as solvent, the rate constants are different between initial stage and final stage, which belongs to different hydroxyls in 1,2-propanediol. However, when toluene or xylene is used as solvent, the rate constant is the same. That is, there is no reactivity difference for hydroxyls in 1,2-propanediol.

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Periodical:

Advanced Materials Research (Volumes 450-451)

Pages:

38-41

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.450-451.38

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Online since:

January 2012

Authors:

Peng Fei Yang

Keywords:

Isocyanate, Kinetic, Polyurethane (PU), Solvent Polarity

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