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Polymer Crosslinking & Viscosity

Polymer Crosslinking & Viscosity - Polymer...

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Polymer Cross-linking & Viscosity Lab Instructor: Xiaoxiao Li November 8, 2007
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Results & Discussion: A solution of poly(vinyl alcohol) (PVA) was created, and the effect of cross linking had on the polymer solution viscosity was analyzed by first adding borate ions to the solution (B(OH) 4 ) - ), then sulfuric acid (H 2 SO 4 ), and then sodium hydroxide (NaOH). One experimental trial was performed and all results were qualitative, no quantitative results were measured. PVA solution was formed slowly adding and stirring 2.005 g of PVA to 50.0 mL of boiled water held at a temperature of about 90 ° C. Viscocity: comparable to a very light oil. Observations: slightly cloudy but clear and colorless. Some crystals formed a gel-like complex and did not entirely dissolve. Next 0.404 g of Borax was dissolved in 10mL of hot water to form borate ions as described below: Na 2 B 4 O 7 (s) + 7H 2 O (l) 2B(OH) 3(aq) + 2Na + (aq) + 2B(OH) 4 - (aq) 10 drops of methyl red indicator were added to PVA solution. The solution turned a light yellow- green. Addition of Borax proceeded as described below. Borate ions were added in 1mL
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