Determination of Aromatic Amine in Segmented Polyurethaneurea.

Abstract

A quantitative analytical method for a small amount of aromatic amino groups derived from some side reactions in segmented polyurethaneurea (SPU) was established. The amount of aromatic amino qroups in SPU was proportional to water content in the raw materials. The aromatic amine content in SPU in creased by hydrolysis of SPU. The reactions with various model compounds were investigated in order to clarify which chemical bonds in SPU gave aromatic amino grops. The results suggested that the amino groups were derived from the hydrolysis of biuret bonds in SPU analogous to that in 1, 3, 5-triphenylbiuret.