Polymer Cross-linking and viscosity

Polymer Cross-linking and viscosity - Polymer Cross-Linking...

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Polymer Cross-Linking and Viscosity By Jared Hartzman Lab Instructor: Andrei Albulescu November 14 th , 2008 Results and Observations:
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A. The purpose of this experiment is to determine the effect cross-linking has on the viscosity of the polymer solution. (Does cross-linking increase, decrease, or have no effect on the viscosity of the polymer solution? If there is an observable effect, is it proportional to the extent of cross-linking? Does the removal of cross linking by the addition of sulfuric acid bring about a complete restoration of the viscosity of the pre-crossed-linked polymer solution? Does neutralization of the acid lead to a complete restoration of the viscosity of the cross-linked polymer solution?) B. Viscosity refers to a liquids resistance to flow. To measure viscosity, small ball bearings or marbles were dropped into a substance and the time was recorded for the objects to fall through a certain depth. The greater the viscosity of the substance, the longer it took for the ball to fall. C. The measurements of viscosity were recorded in a combination of qualitative and quantitative measurements and were examined at four certain points in the procedure.
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