Polymers - Polymer Cross-Linking and Viscosity By Andrew...

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Polymer Cross-Linking and Viscosity By Andrew Corridore Lab Instructor: Claire Ralph November 5 th , 2007
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Results and Discussion : The purpose of the experiment was to determine the effects cross linkings have on viscosity. In order to determine the relationship; cross linkings were created on the polymer PVA and the solution’s viscosity was tested with a marble and a steel bearing ball. Also, a general qualitative observation was made about each substance as cross- linkings were made and then broken. 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. Observation : the solution turned a light yellowish color. Before the borax solution was added to the PVA solution, a viscosity test was conducted. In order to measure the solution’s viscosity, 10mL of the PVA solution was poured into a graduated cylinder. Then a marble was dropped from the top of the graduated cylinder, and the time it took the marble to reach the floor of the graduated cylinder was measured. Also, a qualitative description was observed as well. The results for both tests are as follows: Test Observation Marble .4 sec Steel Bearing Ball <.1 sec General Qualitative Assessment Water-like substance Next 3mL in total of the borax solution was added to the PVA solution, and the cross
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This note was uploaded on 03/09/2009 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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Polymers - Polymer Cross-Linking and Viscosity By Andrew...

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