Transport in intermediate and high molecular weight hydroxypropylcellulose/water solutions

We obtained the shear viscosity η and optical probe (67-nm polystyrene later spheres) diffusion coefficient D in hydroxypropylcellulose (HPC)/water at temperatures T=10,25, and 39 o C. Polymer samples had molar masses M w of 139, 146, 415, and 1280 kDa. Polymer concentrations c ranged up to 40-100 g/L; η was as large as 10 3 -10 6 cP in different systems. η has a stretched-experimental dependence on c at small c and power-law behavior at large c. D generally follows a stretched exponential D 0 exp(-αc ν ) but is consistent with power-law behavior at large c