The physical properties of 5 wt% poly(NIPAM) (M-v = 3.22 X 10(5)) semi-dilute solutions in H2O, D2O, and THF (tetrahydrofuran) solvents were studied using dynamic light scattering (DLS) and dynamic shear viscosity (DSV) measurements. The DLS data showed that there were poly(NIPAM) slow mode inter-polymer chains associations in H2O and D2O solvents. However, no DLS slow mode was observed in poly(NIPAM)/THF solutions. The DSV data showed that there are shear thickening behavior in these three poly(NIPAM) solutions, resulting in a maximum shear viscosity eta(peak) in the viscosity eta'(omega) versus shear frequency omega curve. The slow mode hydrodynamic radius (Rh,) of DLS measurements and the zero shear rate viscosity eta(0) and maximum viscosity eta(peak) data of DSV measurements from poly(NIPAM)/H2O and poly(NIPAM)/D2O solutions show two critical transition temperatures with T-cr1 = 30-32 degreesC and T-cr2 = 32-34 degreesC. Poly(NIPASM)/D2O has higher T-cr1 and T-cr2 than poly(NIPASM)/H2O. However, no transition temperatures of poly(NIPAM)/THF solution were observed. The different temperature dependencies of these three solutions were attributed to the 'solubility' and 'hydrogen bonding' effects between poly(NIPAM) with H2O, D2O, and THF solvents. Without considering the polymer-solvent hydrogen bonding, the solubility of poly(NIPAM) in solvents decreases in the following sequence: THF > H2O > D2O and the degree of polymer-solvent hydrogen bonding increases in the following sequence: THF < H2O < D2O. The effects of the degree of 'hydrogen bonding' and the 'solubility' of polymer in solvents on the physical properties of poly(NIPAM) solutions are discussed. (C) 2004 Elsevier Ltd. All rights reserved.