Polymer Cross Linking and Viscosity

Polymer Cross Linking and Viscosity - but more viscous than...

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Polymer Cross Linking and Viscosity Lab Instructor: Dan Mack November 8, 2007
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Results: The effect of cross-linking on the viscosity of a Poly(vinyl alcohol) solution was determined. Viscosity was measured qualitatively and compared to common things in life. The data collected is shown in Table 1. Table 1: Qualitative Analysis of Viscosity of PVA solution Mixture Original PVA solution Borax Added Sulfuric Acid Added Sodium Hydroxide Added Viscosity More viscous than water; similar to tea with honey Became greatly more viscous, like silly putty Became less viscous,
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Unformatted text preview: but more viscous than original solution. Similar to cough syrup. Became most viscous. Similar in viscosity to crumpled gelatin Conclusion: It was concluded that cross-linking increases the viscosity of the polymer solution, and it is proportional to the extent of cross-linking. It was determined that breaking the cross-linking by adding sulfuric acid does not restore the viscosity of the non-cross linked solution. It was also determined that neutralizing the acid does not completely restore the viscosity of the cross-linked solution....
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