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Experiment7 copy - Experiment#7 Polymer Cross-Linking and...

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Experiment #7: Polymer Cross-Linking and Viscosity
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Purpose: The purpose of this experiment was to determine the effect of cross-linking with borate ion on polymer poly (vinyl alcohol) (PVA) viscosity. Results and Discussion: First, a PVA solution was prepared. 50 milliliters (mL) of H 2 O was boiled on a hotplate. As the water was cooled and kept at a constant 90 degrees Celsius, 2 grams (g) of PVA was massed on a balanced electronic scale and slowly added. The viscosity of the solution was measured after the solution cooled. It was intended that the time for a marble to pass through the solution would be recorded. When this procedure was carried out on the PVA solution, however, the marble passed through too quickly for an accurate measurement to be made. This measurement was recorded qualitatively. The viscosity of this solution, before cross-linking occurred, can be described as only slightly more viscous than water. Overall, the solution had low viscosity. To cross-link the PVA, the PVA solution, along with 10 drops of methyl red pH
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This note was uploaded on 06/03/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell.

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Experiment7 copy - Experiment#7 Polymer Cross-Linking and...

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