聚N,N-二乙基丙烯酰胺溶液粘度的温度依赖性

通过自由基聚合,合成了线型聚N,N-二乙基丙烯酰胺（PDEA）,用乌氏粘度计测定并考察了该聚合物在四氢呋喃（THF）、H2O以及THF-H2O混合溶剂中粘度的温度依赖性.实验结果表明,PDEA 在上述三种溶剂中粘度的温度依赖性不同，PDEA-THF体系的相对粘度随温度升高而增大；PDEA-H2O体系以及PDEA-THF-H2O体系的相对粘度随温度升高而减小,且THF体积分数φTHF < 0.7时具有透明-白浊转变现象；对PDEA-THF-H2O体系,φTHF增加,透明-白浊转变温度升高,而当φTHF=0.7时,则观察不到透明-白浊转变现象.

The Temperature Dependence of the Viscosity of Poly(N,N-diethylacrylamide) Solutions

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.