polymer cross linking and viscosity

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

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Polymer Cross-linking and Viscosity Results and Discussion The purpose of this experiment was to observe the effect that cross-linking has on polymer solution viscosity. To do this, a mixture of poly(vinyl alcohol) solution and borax solution was made. Initially, 1.993 grams of PVA powder was slowly dissolved in 50mL of water heated to 90ºC. In a separate beaker, 0.416 grams of borax were dissolved in hot water. Dissolving the borax in water forms borate ion as shown in the following equation: Na 2 B 4 O 7 ∙10H 2 O (s) 2B(OH) 3 (aq) + 2Na + (aq) + 2B(OH) 4 - (aq) + 3H 2 O(l)
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10 drops of 0.1% methyl red was added to the PVA solution, causing it to turn light yellow. Then, when the PVA solution cooled down, 3.0 mL of borax solution was added (1.0 mL at a time). The addition of borax solution caused the PVA to congeal together into a solid, gooey mass. When 3 drops (approximately 0.1 mL) of 3.0 M H 2 SO 4 was added to the congealed mass, the color of the PVA and borax mixture turned pink and the gooey mass thinned a little. The
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polymer cross linking and viscosity - Polymer Cross-linking...

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