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Biuret

   Also found in: Medical, Encyclopedia, Wikipedia 0.03 sec.
Bi´u`ret
n.1.(Chem.) A white, crystalline, nitrogenous substance, C2O2N3H5, formed by heating urea. It is intermediate between urea and cyanuric acid.


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Here we see a chain extension through the hydroxyl end groups, plus a crosslinking through formation of allophanate or biuret structures.
An introduction to the chemistry of polyurethane rubbers by Ahnemiller, Jim / Rubber World
This chemical bonding, for example, between the urea and isocyanate is called Biuret bonding (figure 1).
Crosslinking structure and properties of poly(urethane-urea) ... by Inoue, Sakae / Rubber World
Upon postcuring, additional isocyanate can react with the urea to give biuret or with the urethane to give allophanate.
Chemical degradation of polyurethane by Gajewski, Vincent / Rubber World
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