Lab 7 - Cross Linking - Negligible Extremely viscous Cannot...

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Polymer Cross Linking and Viscosity November 5, 2007 1
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Results and Discussion: In this lab we examined cross linking’s effect on the viscosity of a polymer solution. We measured the viscosity of the solution qualitatively. We ran a stirring stick through the solution and rated the viscosity according to its resistance to stirring and coagulation on the stirring utensil. Phase Water Water + PVA + Borax + H 2 S0 4 + NaOH Viscosity Not viscous. No resistance to stirring. No collection on stirring rod. Slightly viscous. A bit of resistance to stirring. Slowly dripped off rod. Very viscous. Moderately difficult to stir. Clumping on end of rod. Slightly less viscous than previous.
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Unformatted text preview: Negligible. Extremely viscous. Cannot stir, but rather swirl. Big glob on end of rod. If asked to rank the viscosity on a scale of 1-10: Water: 0 Water + PVA: 2 Water + PVA + Borax: 6 Water + PVA + Borax + H 2 S0 4 : 5 Water + PVA + Borax + H 2 S0 4 + NaOH: 9 Conclusion : This lab demonstrated that cross linking increases the viscosity of a polymer solution. The removal of cross linking by the addition of a known amount of acid, which decreasing the viscosity, does not completely restore the solution to its previous viscosity. Finally, the neutralization of the added acid does restore, if not increase, the viscosity of the solution. 2...
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