The chemical behavior of polyisocyanates was investigated. Dissociation of the polymer to the monomer was observed directly by infrared spectra. Aminolysis of the polymer gave cyclic trimer and asymmetric urea as reaction products, and the formation of the latter was ascribed to the reaction of amine with the monomer dissociated from the polymer. It was concluded that polyisocyanates are composed of disubstituted amide structure only.
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Iwakura et al. (1968) studied this question.
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