The zero-shear viscosity of moderately concentrated solutions of cellulose acetate is studied iJ'l two different solvents namely; cyclohexanone and dioxane to investigate the effect of solvent on the polymer viscosity. For each solvent the ratio of the increment in the logarithemic zeroshear viscosity and logarithmic change of concentration (d In "oId InC) is calculated. To find out the effect of both temperature and concentration on the zero- shear viscosity of the polymer, solutions in dioxane are studied at various temperatures and it was concluded that the particle aggregation is affected when both the temperature and concentration are changed.
I U KHAN ,N AHMAD ,A SAEED ,
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