DANGLING POLYMER NETWORKS - GLASS-TRANSITION OF PU ELASTOMERS

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