Polymers - Polymer Cross-Linking and Viscosity Nadiya...

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Polymer Cross-Linking and Viscosity Nadiya Atkinson Lab Instructor: Deepti Gadi November 9, 2007
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Results and Discussion: A procedure was created and carried out, which was capable of determining the effect cross-linking has on polymer solution viscosity. This procedure was performed using a borate ion to cross-link strands of polymer poly (vinyl alcohol). Part A: Cross-Linking PVA Two grams of poly vinyl alcohol (PVA) was dissolved into a solution of water until a clear, colorless solution was obtained. Once the PVA cooled, the viscosity was tested and results indicated a solution that was thicker than water and which took a marble ball 2.64 seconds to travel down 20 mL of solution. Ten drops of 0.1% methyl red indicator were added to the solution, which made it turn a light yellow color. A borax solution was made by adding 0.4 grams of borax to 10 mL of water. The borax solution was added to the PVA solution, which made it clump at the beginning and as more borax solution was added, the mixture became a gooey glob.
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