Abstract: Linear Poly(N,N-diethylacrylamide)(PDEA) was synthesized by radical polymerization. The temperature dependence of the relative viscosity of PDEA-THF, PDEA-H2O and PDEA-THF-H2O solutions was investigated. Our results showed that the viscosity of PDEA in three different solvents was influenced differently by temperature. The relative viscosity of PDEA-THF solution increased with increasing temperature, while that of PDEA- H2O and PDEA-THF-H2O showed the inverse trend, namely, increasing of temperature led to the decreasing of viscosity, at the same time, the phenomenon of transparent-opaque transition could be observed as the volume fraction of THF (φTHF) was less than 0.7. For PDEA-THF-H2O solution, on the other hand, the transparent-opaque transition temperature increased with the increasing of φTHF. However, when φTHF was 0.7, the transparent-opaque transition phenomenon disappeared.

Key words: Poly(N,N-diethylacrylamide), Solution property, Viscosity, Hydrogen bond, Lowest critical solution temperature