Polymer Cross Linking and Viscosity

Polymer Cross Linking and Viscosity - Polymer Cross Linking...

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Polymer Cross Linking and Viscosity Gardner Yost November 4, 2008 Lab Instructor: Tyi McCray Lab O
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Purpose: To devise and perform a procedure capable of determining the effect of cross linking has on solution viscosity. Borate ion will be used to cross link strands of the polymer polyvinyle alcohol (PVA). The PVA solution was slowly made by sprinkling PVA powder and stirring it into water until, the solution was homogenous, clear and colorless. After the PVA solution was made, 10 drops of methyl red indicator was mixed into the solution. Observations: After the addition of the Methyl red indicator to the PVA solution, the solution became a pale yellow Viscosity Substance Marble Ball Bearing Tap Water .6s .3s PVA 1s .4s PVA + 1ml borax 70s 82s PVA + 2ml borax No movement No movement PVA + 3ml borax No movement No movement Addition of H SO 13s .9s Addition of NaOh No movement No movement Notes: Viscosity measured by the time it took a marble and ball bearing to fall to the bottom of 25 ml of the given substance in a graduated cylinder.
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