Effect of physical ageing on the viscoelasticity of interpenetrating polymer networks

✍ Scribed by Lipatov, Y?S; Rosovitsky, V?F; Alekseeva, T?T; Babkina, N?V

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 66 KB
• Volume: 49
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(200004)49:4<334::aid-pi371>3.0.co;2-q

✦ Synopsis

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. Signi®cant changes in viscoelastic behaviour after ageing were observed. It was found that heterogeneous systems such as IPNs have their own speci®c 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.