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Abstract
A normal-phase high-performance liquid chromatographic method is described for the determination of aliphatic and aromatic poly isocyanate monomers or prepolymers after derivatization with 1-(2-methoxyphenyl) piperazine.
The separation of 2,4 TDI, 2,6 TDI, HDI and MDI derivatives was performed with 5 and 10 μm cyan-amino bonded silica columns, under isocratic conditions and with ultra-violet detection. The same elution conditions were used for the resolution of several commercial isocyanate prepolymer derivatives, in reasonable analysis times.