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A. Balas, R. Lisowska, I. Canowiecka


The effect of n-butyllithium and 1,4-butylenedilithium on the transitions in a urethane prepolymered

synthetized from oligo(oxypropylene) glycol and 2,4-toluylene diisocyanate


Polimery 1982, No 4, 160



DOI: dx.doi.org/10.14314/polimery.1982.160

Summary

The results of studies on the effect of n-butyllithium and 1,4-butylenedilithium on the process of transition of the urethane prepolymer with free isocyanate groups into solid cross-linked urethane elastomers have been presented. The IR-spectroscopic determinations have shown that this process proceeds by the polymerization and cyclopolymerization of free isocyanate groups and with the formation of cross-linking allophanate groups. The cross-linking density has been measured by the method of equilibrium swelling. These measurements have shown that the cross-linking density of the obtained elastomers increases with the increase in the concentration of the organolithium compounds. An interpretation of the observed realtionships has been presented.


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