Abstract
Model networks prepared from polyoxypropylenetriols (PPT) and diphenylmethane diisocyanate (MDI) in an excess of NCO groups were found to contain unusually small amounts of sol, ws, and to have high values of the equilibrium modulus, suggesting an additional crosslinking, probably due to the formation of trifunctional allophanate crosslinks. A comparison of the ws values with the theory of branching processes in which the formation of both urethanes and allophanates is considered allowed us to determine the possible extent of the allophanate reaction, and to calculate the concentration of elastically active chains contributed by PPT and allophanate crosslinks.
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