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Determination of hydroxyl number of polyoxyalkylene ethers by reaction with toluene diisocyanate
Author(s) -
Otey F. H.,
Zagoren Bonnie L.,
Mehltretter C. L.
Publication year - 1964
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1964.070080505
Subject(s) - isocyanate , toluene diisocyanate , toluene , reagent , polyurethane , catalysis , hydroxyl value , chemistry , organic chemistry , polymer chemistry , polyol
A new method for hydroxyl analysis is described in which excess toluene diisocyanate is reacted with a hydroxy compound, preferably in the presence of a catalyst, and the unreacted isocyanate is determined with dibutylamine reagent. The method is particularly applicable to polyethers intended for urethane foam preparation. It is rapid, is accurate, and has the added advantage of including such impurities as would be expected to consume isocyanate during a foam preparation.