Polymer Cross Linking and Viscosity Results and Discussion

Polymer Cross Linking and Viscosity Results and Discussion...

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Results and Discussion A procedure was implemented that showed the effect that cross-linking has on polymer solution viscosity. 2.003 grams of PVA [poly(vinyl alcohol)] were weighed out using an electronic balance. The PVA appeared as small white crystals. A little bit of PVA was sprinkled into a beaker of 50 mL of tap water at 90ºC. A stirring bar was used to slowly dissolve the PVA in the tap water, while keeping the temperature of the solution near 90ºC. After all 2.003 grams of PVA were dissolved, the final solution appeared colorless and uniformly liquid. 0.401 grams of borax (Na 2 B 4 O 7 . 10 H 2 O) was then obtained and placed in a 50 mL beaker containing 10 mL of hot water. The borax appeared as a fine white powder. When the borax and the water were mixed, a colorless solution was formed. The reaction was as follows: Na 2 B 4 O 7 . 10 H 2 O (s) 2 B(OH) 3 (aq) + 2 Na + (aq) + 2 B(OH) 4 - (aq) + 3 H 2 O (l) Ten drops of 0.1% methyl red indicator were then added to the PVA solution.
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Polymer Cross Linking and Viscosity Results and Discussion...

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