RUBBER ELASTICITY AT LARGE DEFORMATION (IX)

Stress-strain Behavior of Polyurethane Elastomers Modified by the Addition of Vinyl Monomer

Abstract

In the earlier papers, a modification of polyurethane elastomers was carried out by addition of several kinds of vinyl monomers, in a one-shot polymerization system in the presence of triethylene diamine and epoxy resin as a catalyst. In this study, the stress-strain curve of modified polyurethane was analyzed with our proposed elastic equation and Mooney-Rivlin equation. And then the behavior of vinyl monomer in the polyurethane matrix was discussed by the use of the parameters such as vkT, b, C₁ and C₂ obtained by the plot of both equations.
As the result, vkT and C₁ concerned with primary linkage came to have high values by addition of vinyl monomers. Mean while b and C₂ arising from the weak secondary linkage decreased with an increasing amount of the vinyl monomers. Furthermore, the temperature dependency of b and C₂ with respect in these vinyl monomer-modified polyurethanes was dower than that of the control or the polymer blended one.
These results suggest that the vinyl monomers were blocked with the polyether segment at the stage of polyurethane formation.