Mechanical properties of polyurethane foams modified by polymer-polyols

The mechanical properties of polyurethane foams based on tolylene diisocyanate and polyether modified by polymer-polyol, which is a styrene-acrylonitrile copolymer grafted onto polyol, were studied. The breaking stress, the hardness at 40% compression, the elongation at break, and the density depend on the amount of both the hard phase in the polymer-polyol and the polymer-polyol component in the polyurethane foam composition. Samples with a density of ～30 kg/m³ were prepared to have other mechanical properties practically identical to those of standard samples with a density of ～37–47 kg/m³.