lab 8 - Polymer Cross-Linking and Viscosity By Robert...

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Polymer Cross-Linking and Viscosity By Robert Dutchen Lab Instructor: Samik Jhulki November 8, 2010
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Purpose: To design and perform a procedure in order to observe the effect of cross- linking on polymer solution (PVA) solution viscosity Procedure: 50 mL of tap water was heated via a hot plate until just prior to boiling. 2.005 g of PVA crystals was obtained and very slowly added to the water (in order to prevent clumping), being consistently stirred to allow for complete dissolving. 0.401 g of borax was dissolved completely in 10 mL of heated tap water. 10 drops of 0.1% methyl red indicator was added to the PVA solution. Viscosity was measured by eye on a 1 to 10 scale with 1 being least viscose and 10 being most viscose. 1.0 mL of the borax solution was added to the PVA solution and it was mixed. A second and third 1.0 mL portion of borax was added following this. 3 M H 2 SO 4 (sulfuric acid) was added drop-wise to turn the PVA mixture red. Finally 2.0 mL of 1.0 NaOH was added to turn the mixture back to
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This note was uploaded on 11/16/2010 for the course ACCT 120xC taught by Professor Dr.lillie during the Spring '10 term at UCLA.

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lab 8 - Polymer Cross-Linking and Viscosity By Robert...

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