Abstract
Abstract The dynamic viscosity, dynamic rigidity and steady-flow viscosity at 30°C have been measured for 11∼12% solutions of four specimens of polyvinyl alcohol, GH-17, GH-23, NH-17 and HN-26, 20, 60 and 110 hr. after the preparation of the solutions. In the dynamic measurement by a top-drive coaxial oscillation rheometer, the relations of η and G vs. ω did not depend on time and have all been explained by Rouse’s theory except for NH-26, the latter showing time and ω dependencies of the structure. In the steady-flow measurement by a coaxial rotation viscometer, the viscosity of all the polymers showed both time and velocity gradient dependencies.
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