Polymer cross-linking and viscosity

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

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Polymer Cross-Linking and Viscosity by Megan Lawless Lab Instructor: Mr. Hoch November 9, 2007
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Results and Discussion: The purpose of this experiment was to devise and perform a procedure that could determine the effect of cross-linking on the viscosity of a polymer solution. Poly(vinyl alcohol) was cross-linked using borate ions. 50 mL of tap water was heated until it began to boil, and then was allowed to cool to 90°. 2.011 grams of poly(vinyl alcohol) was slowly added to the hot water with stirring. Once all of the PVA was added, the solution appeared to be slightly viscous and had a fairly clear color. 10 drops of 0.1% methyl red indicator was added to the PVA, making the solution faintly yellow. At this point the first measure of viscosity was made (Table 1). The measurement was made by pouring 25 mL of the PVA solution into a graduated cylinder and timing how long it took for a marble to reach the bottom of the cylinder. 3.0 mL of a borate ion solution was added, and a second viscosity measurement was made. The borate ion solution was formed by adding borax to
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  • Fall '05
  • Chemistry, Polymer, Sulfuric acid, PVA, borate ions, average deviation measurement

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