cousre heoPolymer_Cross[1] - Polymer Cross-Linking and...

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Polymer Cross-Linking and Viscosity November 5, 2007
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Results and Discussion: Poly Vinyl Alcohol (PVA) was dissolved into water, and then Borax (Na 2 B 4 O 7 * H 2 O) (a cross-linking agent) was added, to determine the effects of the cross linking agent on the viscosity of a substance. Also H 2 SO 4 was added to determine the effects of removing a cross-linking agent with an acid and likewise restoring it with the base NaOH. Viscosity was measured using a small silver ball (marble – like) and the rate at which it dropped to the bottom of a 25 mL graduated cylinder at the height of .125 cm. What was measured/ observed Measurement/Description of viscosity 2 g PVA dissolved in water .44 seconds over .125 meters PVA. It was fluid like. Addition of (Na 2 B 4 O 7 * H 2 O) Measurement was impossible quantitatively as the silver ball would not penetrate the substance. Its consistency was that of rubber cement. Addition of 4 drops H 2 SO 4 (acid) .53 seconds over .125 meters.
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This note was uploaded on 03/19/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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cousre heoPolymer_Cross[1] - Polymer Cross-Linking and...

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