DANGLING POLYMER NETWORKS - GLASS-TRANSITION OF PU ELASTOMERS

Polyurethane elastomers possessing dangling chains were prepared by partial substitution of the multifunctional polyol with a monohydroxyl alcohol in the reaction with an isocyanate terminated prepolymer. The dynamic mechanical spectroscopy showed that created dangling segments resulted in a broader glass-transition region. This indicated material with potentially good energy absorbing properties might be prepared from a 'dangling polymer' system. (C) 1993 John Wiley & Sons, Inc.