User:Karlena L. Brown/Notebook/PVOH Research/2012/09/01: Difference between revisions

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==PVOH Film Procedures==
==PVOH Film Preparations 2==
* Prepared PVOH films in water.
'''Prepared PVOH films in water:'''
** 0.5 grams PVOH (MW 130,000) in 3 mL H<sub>2</sub>O
* In 10mL beaker, weigh out ~ 0.5 grams PVOH (MW 22,000)    
** 1.0 grams PVOH (MW 130,000) in 5 mL H<sub>2</sub>O
'''(Actual mass = 0.5163g)'''
* Then, using a graduated cylinder add ~ 3mL H<sub>2</sub>O to the beaker
* Next, at the fume hood add two drops of hydrochloric acid (HCl)to beaker solution
* In another 10mL beaker, weigh out ~ 1 gram PVOH (MW 22,000)     
'''(Actual mass = 1.0204g)'''
* Next, at the fume hood add two drops of sulfuric acid (H<sub>2</sub>SO<sub>4</sub>)to beaker solution
* Then, using a graduated cylinder add ~ 6mL H<sub>2</sub>O to the beaker
* Finally, in another 10mL beaker, weigh out another ~ 1 gram sample PVOH (MW 22,000)    
'''(Actual mass = 1.0040g)'''
* Then, using a graduated cylinder add ~ 6mL H<sub>2</sub>O to the beaker
* Next, at the fume hood add two drops of phosphoric acid (H<sub>3</sub>PO<sub>4</sub>)to beaker solution


*Standard PVOH Film Protocol
'''Standard PVOH Film Protocol:'''
# Combine in small beaker with stir bar.
* After adding and combining PVOH (MW 22,000) in small beakers with H<sub>2</sub>O and acids, add stir bars and prepare to stir solutions.
# Heat on hot plate to 70-80°C until PVOH dissolves.
* On hot plate, stir and heat all beaker solutions at 70-80°C for ~ 12 min or until PVOH dissolves.
# Pour solution into Teflon dish and let sit to dry.
* Once PVOH solids dissolve in solution, pour each solution in Teflon dishes to sit, cool, and dry in a fume hood for ~ 4 days.  
 
'''Notes:'''
* An additional 2-3 mL H<sub>2</sub>O was added to each solution to aid the dissolving of the PVOH
* Heat was reduced when solutions began to boil too rapidly
* As solutions heated, beakers containing the strong acids (HCl and H<sub>2</sub>SO<sub>4</sub>) left burn marks at the bottom of solution -- slightly tinting the PVOH 1 gram solutions brown
* While transferring solutions to Teflon dishes, loss of sample within the small beakers (sample loss = incomplete sample transfer)


*Notes
**An additional 2-3 mL H<sub>2</sub>O was added to each solution to fully dissolve the PVOH.


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Revision as of 22:34, 31 August 2012

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PVOH Film Preparations 2

Prepared PVOH films in water:

  • In 10mL beaker, weigh out ~ 0.5 grams PVOH (MW 22,000)

(Actual mass = 0.5163g)

  • Then, using a graduated cylinder add ~ 3mL H2O to the beaker
  • Next, at the fume hood add two drops of hydrochloric acid (HCl)to beaker solution
  • In another 10mL beaker, weigh out ~ 1 gram PVOH (MW 22,000)

(Actual mass = 1.0204g)

  • Next, at the fume hood add two drops of sulfuric acid (H2SO4)to beaker solution
  • Then, using a graduated cylinder add ~ 6mL H2O to the beaker
  • Finally, in another 10mL beaker, weigh out another ~ 1 gram sample PVOH (MW 22,000)

(Actual mass = 1.0040g)

  • Then, using a graduated cylinder add ~ 6mL H2O to the beaker
  • Next, at the fume hood add two drops of phosphoric acid (H3PO4)to beaker solution

Standard PVOH Film Protocol:

  • After adding and combining PVOH (MW 22,000) in small beakers with H2O and acids, add stir bars and prepare to stir solutions.
  • On hot plate, stir and heat all beaker solutions at 70-80°C for ~ 12 min or until PVOH dissolves.
  • Once PVOH solids dissolve in solution, pour each solution in Teflon dishes to sit, cool, and dry in a fume hood for ~ 4 days.

Notes:

  • An additional 2-3 mL H2O was added to each solution to aid the dissolving of the PVOH
  • Heat was reduced when solutions began to boil too rapidly
  • As solutions heated, beakers containing the strong acids (HCl and H2SO4) left burn marks at the bottom of solution -- slightly tinting the PVOH 1 gram solutions brown
  • While transferring solutions to Teflon dishes, loss of sample within the small beakers (sample loss = incomplete sample transfer)



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