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Synthesis and Characterization of Polyurethanes With High Content of Biuret Groups

A. Šebenik ; The Boris Kidrič Institute of Chemistry Ljubljana, Yugoslavia


Puni tekst: engleski pdf 2.735 Kb

str. 121-127

preuzimanja: 793

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Sažetak

An 'H-NMR and 13C NMR study of the reaction between
urea and 4,4'-diphenylmethanedisocyanate is reported. Assignments
for individual signals of biuret groups were determined and their concentration dependence on the reaction time was established. The rate constants for different biuret oligomers were calculated. From biuret oligomers and urethane oligomers block cooligomers and later block copolymers were formed.

Ključne riječi

Hrčak ID:

176165

URI

https://hrcak.srce.hr/176165

Posjeta: 962 *