Polymers - Polymers By Kolene McDade TA Subhadeep Banerjee...

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Polymers By Kolene McDade TA: Subhadeep Banerjee May 12, 2009
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Results and 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. No quantitative results  were measured. The solution of PVA was made by heating  50 mL  of water to its boiling  point, approximately 100  ° C, and slowly adding the  2.000g  of PVA. 20 extra mL  of water was added to the solution to maintain a uniform consistency during this  process, do to its loss from evaporation. With constant stirring, the PVA  completely dissolved into a solution that was: Clear  Nearly colorless  More viscous than water, but is still able to flow easily Next, a solution of Borate ions was formed by dissolving  0.401 g  borax,  Na 2 B 4 O  H 2 O in  50 mL  of water: Na 2 B 4 O 7 (s)  + 7H 2 O (l) 
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