Poly(N-isopropylacrylamide) (PNIPAAM) was synthesized by free radical polymerization.By means of Ubbelodhe viscosimeter

the temperature dependence of viscosity of PNIPAAM THF and PNIPAAM H2O systems was tested.The relative viscosity of PNIPAAM THF system was found linear increased with temperature increased

the higher the temperature was

the larger the viscosity deviated from Einstein's theory for viscosity of suspension

the dispersed substance was found tended to linear structure in high temperature.But the relative viscosity of PNIPAAM-H2O system was found inereased slow with temperature increased and the transformation points were found

the higher the temperature was

the little the viscosity deviated from the Einstein's theory

the dispersed substance was found tended to globular structure in high temperature.The intrinsic viscosity of PNIPAAMTHE system was found increased with temperature increased

but the intrinsic viscosity curve of PNIPAAM-H2O system was quite complex

and the step declining curve was found.But the viscosity curve of PNIPAAM-H2O system was quite complex.The intrinsic viscosity determined by experiment was also used to characterize the molecular weight of PNIPAAMMn=8.44×105g·mol-1.