Kinetic methods phenyl isocyanate method

A reliable method to determine the oligo-polyol reactivity is the study of the kinetics of the oligo-polyol s reaction with phenyl isocyanate, a model for the -NCO groups of toluene diisocyanate (TDI) or diphenylmethane diisocyanate (MDI) ... 

Reaction rate differences of primary and secondary hydroxyl groups with phenyl isocyanate are basis of a kinetic method for carrying out this determination [26] (see Method 3.3). 

Method 3.3 Determination of Primary and Secondary Hydroxyl Groups in Ethylene Oxide Tipped Glycerol-Propylene Oxide Condensates. Phenyl Isocyanate Kinetic Method... 

In many situations it is necessary to be able to determine both primary and secondary hydroxy groups in polymers. This kinetic method, based on the difference in reaction rate of primary and secondary hydroxy groups with phenyl isocyanate enables both groups to be determined. 

METHOD 59 - DETERMINATION OF PRIMARY AND SECONDARY HYDROXYL GROUPS IN ETHYLENE OXIDE TIPPED GLYCEROL-PROPYLENE OXIDE CONDENSATES. PHENYL ISOCYANATE KINETIC METHOD. 

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