Polymers - Polymers By Nicole Monteleone Lab Instructor:...

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Polymers By Nicole Monteleone Lab Instructor: Mr. Bob Nueman November 6, 2006
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Purpose: To determine the effect of cross-linking has on a polymer solutions viscosity. Results and Discussion The reaction that is taking place in this experiment is Na 2 B 4 O 7 + 7H 2 O 2B(OH) 3 + 2 Na + + 2B(OH) 4 - First the glassware was rinsed. 50 mL of tap water was then heated while stirring. PVA was then measured out. Mass of PVA Collected = 2.460 g - .445 g = 2.015 g The metal ball used to measure viscosity was then weighed and its mass was 5.113 g. The water was cooled to ninety degrees and the PVA was added slowly while the water was gently heated. The viscosity was taken after all of the PVA was added. The solution was thicker and more cloudy. The big ball took 1 second to go 2 cm. The terminal speed = 2/1 = 2 cm/s Viscosity = 5.113/2 = 2.557 centipoises Borax was then collected. Mass of Borax Collected = .833 g - .445 g = .388 g 10 mL of hot tap water was added to the borax while stirring. 10 drops of .1% methyl red
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Polymers - Polymers By Nicole Monteleone Lab Instructor:...

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