User:Melissa Novy/Notebook/CHEM-581/2012/11/20

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Objectives

  • Run UV-vis on salt-exchanged PVOH(22K) + GA + PP films.

UV-Vis of Salt-Exchanged PVOH Films

  • Protocol
    1. Place film in 20 mL 10 mM Fe2(SO4)3.
    2. Time how long it takes for the film to change color from green to pink.
    3. Remove film from salt solution, pat dry with KimWipes, and cut with a 3.5 mm film cutter.
    4. Measure the thickness of the film with calipers, then place it in a quartz cuvette and take a spectrum from 200 nm to 800 nm.
    5. Place the film back in its H2SO4 solution.
    6. Discard the salt solution into a waste container.
    7. Repeat the above steps in 20 mL solutions of Al2(SO4)3 and Na2SO4.
  • The following films were analyzed with this protocol:
    • PVOH(22K) 1.0067 g + 1 mL GA + 1 mL PP + HCl
    • PVOH(22K) 1.0073 g + 1 mL GA + 1 mL PP
    • PVOH(22K) 1.05225 g + 0.5 mL GA + 1 mL PP
  • Note that all films were stored in 2 wt% H2SO4 solution prior to being soaked in the salt solutions.
  • Immediately after being placed in the three salt solutions, the PVOH(22K) 1.05225 g + 0.5 mL GA + 1 mL PP films became colorless.


Film [ ] Salt Solution [ ] Film Thickness [mm] Color [ ]
PVOH(22K) 1.0073g, 1mLGA, 1mLPP Al2(SO4)3 0.6 Green
PVOH(22K) 1.0073g, 1mLGA, 1mLPP Na2SO4 0.5 Pink
PVOH(22K) 1.0073g, 1mLGA, 1mLPP Fe2(SO4)3 0.6 Pink
PVOH(22K) 1.05225g, 0.5mLGA, 1mLPP Al2(SO4)3 0.6 Transparent
PVOH(22K) 1.05225g, 0.5mLGA, 1mLPP Na2SO4 0.1 Transparent
PVOH(22K) 1.05225g, 0.5mLGA, 1mLPP Fe2(SO4)3 0.4 Transparent
PVOH(22K) 1.0067g, 1mLGA, 1mLPP, HCl Al2(SO4)3 0.9 Green
PVOH(22K) 1.0067g, 1mLGA, 1mLPP, HCl Na2SO4 1 Pink
PVOH(22K) 1.0067g, 1mLGA, 1mLPP, HCl Fe2(SO4)3 0.9 Pink



PVOH(22K) 1mLGA, 1mLPP, HCl.jpg

PVOH(22K) 1mLGA, 1mLPP.jpg