User:Moira M. Esson/Notebook/CHEM-581/2012/09/05: Difference between revisions

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==PVOH (MW 22,000) Films==
==PVOH (MW 22,000) Films==
*The following were prepared using the General Protocol for film preparation described on 08/29/12
General Protocol:
#Place 0.5g PVOH in a 10mL beaker with a small stir bar
#Add 3mL of water
#For each additional 0.5g, add an additional ~2mL of water
#Place on hot plate and heat to 70°C-80°C
#Stir and heat until dissolved(~15 min)
#Remove stir bar and any remaining gel
#Quickly pour solution into a Teflon dish. If excess gel is present remove with tweezers
#Allow film to air dry overnight in fume hood
    
    


Revision as of 21:09, 6 September 2012

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Objectives

  1. Prepare four dilute solutions from the stock solution of PVOH (MW 130,000), diluting by 0.75, 0.5, 0.25 and 0.125
  2. Measure the viscosity of PVOH (MW 130,000) at the concentrated stock solution and the four diluted concentrations
  3. Make PVOH (MW 22,000) films in H2O with 2-20wt% maleic or succinic acid and HCL or H3PO3


PVOH (MW 22,000) Films

General Protocol:

  1. Place 0.5g PVOH in a 10mL beaker with a small stir bar
  2. Add 3mL of water
  3. For each additional 0.5g, add an additional ~2mL of water
  4. Place on hot plate and heat to 70°C-80°C
  5. Stir and heat until dissolved(~15 min)
  6. Remove stir bar and any remaining gel
  7. Quickly pour solution into a Teflon dish. If excess gel is present remove with tweezers
  8. Allow film to air dry overnight in fume hood



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