Journal of Coatings Technology

, Volume 69, Issue 873, pp 113–121 | Cite as

Interfacial studies of crosslinked urethanes: Part II. The effect of humidity on waterborne polyurethanes; a spectroscopic study

  • Anneke M. Kaminski
  • Marek W. Urban
Technical Articles


In this study we examined isocyanate crosslinking reactions at the film-air (F-A) and film-substrate (F-S) interfaces of waterborne two-component (2K) urethanes as a function of depth and relative humidity (RH) using attenuated total reflectance (ATR) FTIR spectroscopy. Analysis of water/isocyanate reactions revealed urea formation which further interacts with water via H-bonding. Quantitative analysis of isocyanate consumption showed that the rates of film formation for waterborne polyurethanes are faster than equivalent solvent-borne polyurethanes. These studies showed that isocyanate consumption increases at high relative humidities. Examination of isocyanate consumption as a function of depth from the F-A and F-S interfaces showed that the isocyanate concentration increases when going from 0.65 to 1.14 µm.


Isocyanate Propylene Glycol Methyl Ether Polyurea Film Substrate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media 1997

Authors and Affiliations

  • Anneke M. Kaminski
    • 1
  • Marek W. Urban
    • 1
  1. 1.North Dakota State UniversityUSA

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