Abstract
The effect of physical ageing on viscoelastic properties was studied for semi-IPNs based on crosslinked polyurethane and poly(butyl methacrylate) taken in the ratio 75/25 by mass. The viscoelastic properties of IPNs were studied after physical ageing and after heat treatment at 60 °C. Significant changes in viscoelastic behaviour after ageing were observed. It was found that heterogeneous systems such as IPNs have their own specific features of physical ageing which are related to the existence of two glass transition to temperatures. Relaxation processes to establish the equilibrium state may need a long period of time. © 2000 Society of Chemical Industry
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