chem lab 14 - Sheldon Pope Brandon Pezzuto Polymers Lab...

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Sheldon Pope Brandon Pezzuto Polymers Lab Chem 404 Lab Section 7
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2-14-08 1. a. The purpose of this lab is to learn about the properties of polymers and the role cross linking plays on the viscosity of the polymer during synthesis. Also the purpose of the lab was to study the properties of slime and learn about how variables such as pH have on the viscosity of the plastic. Polymers are long chains of linked hydrocarbons formed by numerous monomers. We learned through our results that strong acids (low pH) such as HCL will break the bonds that link the monomers together to create the polymer. Strong bases such as NaOH formed new crosslink bond. b. The purpose of the lab was fulfilled because we saw that when a strong acid was added the mixture became more viscous, and when the strong base was added the mixture became less viscous. We could see the immediate results of the procedure by seeing if the mixture got more like a liquid, or like slime. 2.
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a. Table 1 Sample: PVA volume (mL) Borax Vol. (mL) Time (s) Visual Observations: PVA 25 ---------------------- -- 2.0 Watery Borax ---------------------- -- 15 3.5 Watery Sample 1 25 1.0 2.5 Thin with few bubbles Sample 2 25 2.0 75 Looks like melted hot glue Sample 3
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chem lab 14 - Sheldon Pope Brandon Pezzuto Polymers Lab...

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