In solutions of isobutyric acid + water, poly( ethylene glycol) ( PEG) can assume a helical conformation. [Alessi, M. L.; Norman, A. I.; Knowlton, S. E.; Ho, D. L.; Greer, S. C. Macromolecules 2005, 35, 93339340.]Here we report new measurements of the kinematic viscosity, v, as a function of temperature for a solution of isobutyric acid + water at the critical composition, to which PEG ( number average molecular weight)=1.01 x 10(3) g/mol) was added at a concentration of 6.01 mg/mL. The data show that v decreases near the critical point, with a maximum in v at about 0.05 degrees C above the critical temperature, T-c. We interpret this change in v in terms of a change in conformation of the polymer from helix to coil. This interpretation is supported by polarimetry measurements on the same mixture doped with (S)-(+)-1,2-propanediol, which indicates the loss of helicity near T-c and also a second helix-to-coil transition at about 60 degrees C.