exp 7 - polymer cross-linking and viscosity

exp 7 - polymer cross-linking and viscosity - Results and...

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Results and Discussion: Vinyl acetate was polymerized and hydrolyzed in a basic solution making CH3CO2- and PVA. This experiment tested the effect of cross-linking on the viscosity of the polymer solution. Part A – Cross-Linking PVA 1.999g of PVA was added to 90°C water and a clear gel-like solution was formed. Ten drops of 0.1% methyl red indicator was added to the solution and it turned yellow. A ball bearing was used to measure the viscosity of the solution. The solution was 1.2 cm in length and the ball went straight through the solution, so it took less than one second. Therefore, the PVA solution had a very low viscosity. 10ml of hot water was added to 0.400 g of borax in a 50 ml beaker. The equation for this reaction was: Na2B4O7 (s) + 7H2O (l) → 2B(OH)3 (aq) + 2Na + (aq) + 2B(OH)4 (aq). Three 1.0 ml portions of the borax solution were added and a homogeneous mixture was formed. The viscosity was measured again using the ball bearing and the ball did not go through 1.5 cm
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This note was uploaded on 02/28/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Spring '05 term at Cornell University (Engineering School).

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exp 7 - polymer cross-linking and viscosity - Results and...

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