User:Moira M. Esson/Notebook/CHEM-581/2012/08/31: Difference between revisions
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*Preparation of 500mL stock solution of PVOH (MW 130,000)in H<sub>2</sub>O required more time(~2-2.5 hrs). Complete dissolution of the polymer required extra time and more vigorous stirring | *Preparation of 500mL stock solution of PVOH (MW 130,000)in H<sub>2</sub>O required more time(~2-2.5 hrs). Complete dissolution of the polymer required extra time and more vigorous stirring | ||
**When dissolving the PVOH (MW 130,000) a large gel-like sphere formed in the center of the solution | **When dissolving the PVOH (MW 130,000) a large gel-like sphere formed in the center of the solution | ||
==Notes== | |||
*An additional 2-3mL H<sub>2</sub>O was added to each solution to aid in the complete dissolution of the PVOH | |||
*Heat was reduced halfway through dissolving the PVOH because the solutions began to boil too rapidly | |||
*When pouring the ~0.5g PVOH (MW 22000) with HCl there was a small loss of sample when pouring the solution into a Teflon dish | |||
Revision as of 18:57, 6 September 2012
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Objectives
PVOH plus acid films
Preparation of PVOH Stock Solutions
Viscosity of PVOH (MW 22000) Stock SolutionGeneral Procedure:
Preparation
Observations
Notes
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