Citation: . EFFECT OF ADSORPTION ON THE VISCOSITY OF DILUTE POLYMER SOLUTION*[J]. Chinese Journal of Polymer Science, ;1999, 17(1): 27-35. shu

EFFECT OF ADSORPTION ON THE VISCOSITY OF DILUTE POLYMER SOLUTION*

Received Date: 27 May 1997

Careful measurements of the dilute solution viscosities of polyethylene glycol and polyvinylalcohol in water were carried out. The reduced viscosities of both polymer solutions plot upward curves atextremely dilute concentration levels similar to the phenomena observed for many polymer solutions in theearly 1950's. Upon observation of the changes of the flow times of pure water in and the wall surfacewettability of the viscometer after measuring solution viscosity, a view was formed that the observed viscosity abnormality at extremely dilute concentration regions is solely due to the effect of adsorption of polymer chains onto the wall surface of viscometer.A theory of adsorption effect based on the Langmuir isotherms was proposed and a mathematical analysis for data treatment was performed.The theory could adequately describe the existing viscosity data.It seems necessary to correct the viscosity result of dilute polymer solutions measured by glass capillary viscometer by taking into account the effect of adsorption in all cases.
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