Polymer Cross Linking and Viscosity

Polymer Cross Linking and Viscosity - This removes the...

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Polymer Cross Linking and Viscosity by Joseph Shapiro Lab Instructor: Robert Neuman November 2, 2007
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Results and Discussion A PVA solution was made with 2.002g of PVA and 50.0 mL of water. The viscosity was measured by dropping a marble into the solution and measuring the time it takes to reach the bottom. Viscosity of PVA solution: T1: .13 s/3cm T2: .12 s/3cm T3: .12 s/3cm 1 mL of Borate is added to the PVA solution Viscosity of PVA- Borate (1mL) T1: 27.3 s/3cm T2: 27.5 s/3cm Another mL of Borate is added Viscosity of PVA- Borate (2mL) T1: 49.64 s/3cm With 3mL Borate T1: 87.11 s/3cm 4 drops of H2SO4 is added (2 drops is tried but it does not produce the desired result)
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Unformatted text preview: This removes the cross- link making the mixture fluid again. Viscosity of PVA- Borate- H2SO4 T1: 0.21 s/3cm 2mL of Borate is added T1: 1.31 s/3cm NOTE: The times become less and less accurate as more borate is added because PVA becomes so thick and viscous measurement is difficult. One might recommended that in terms of the results provided here that the numbers be used in a sort of qualitative fashion. For example the viscosity of the PVA-borate (2mL) is substantially more than the PVA borate(1mL) but not necessarily twice as viscous. Conclusion Cross- linking increases the viscosity of a polymer solution....
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This note was uploaded on 02/10/2009 for the course CHEM 207 taught by Professor Smith during the Fall '07 term at Cornell University (Engineering School).

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Polymer Cross Linking and Viscosity - This removes the...

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