User:Melissa Novy/Notebook/CHEM-581/2012/09/14

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Objectives

  • Crosslink PVOH + glutaraldehyde films.
  • Run DSC on crosslinked PVOH (MW 22000) films.
  • Run FTIR on PVOH (MW 22000) thin film.

DSC on Crosslinked PVOH (MW 22000) Films

  • Please refer to entry on 2012/09/07 for DSC procedure.
  • Crosslinked PVOH (MW 22000):
    • Pan mass: 49.14 mg
    • Sample mass: 3.07 mg
  • Crosslinked PVOH (MW 22000), 10% maleic acid, HCl:
    • Pan mass: 50.57 mg
    • Sample mass: 3.14 mg
  • Crosslinked PVOH (MW 22000), 10% succinic acid, HCl:
    • Pan mass: 49.01 mg
    • Sample mass: 2.86 mg

Crosslinking PVOH (MW 22000) + Glutaraldehyde Films

  • Procedure:
    1. In a 150 mL beaker with stir bar, dissolve 20 g Na2SO4 in 100 mL H2O and 2 mL H2SO4.
    2. Invert the top half of a Buchner funnel over the stir bar and stir and heat the solution to 70°C.
    3. Place an air-dried PVOH (MW 22000) + glutaraldehyde film into the solution and stir for 2 hours at 70°C.
    4. Wash the film with H2O and submerge in 1% HCl for 30 minutes.
    5. Then wash the film with H2O again and place in dilute sodium bicarbonate solution to neutralize any residual acid.
    6. Wash the film with H2O several times further, then let air dry.

FTIR on PVOH (MW 22000) Thin Film

Image:FTIR PVOH(22K).JPG

  • Loss of resolution around 3700 to 3000 cm-1 indicates that the PVOH film is too thick for FTIR. The analysis will be redone in the future with either the same PVOH film suspended in KBr or with a a thinner PVOH film.

Notes

  • The following films were analyzed via DSC today:
    • PVOH (MW 22000)
    • Crosslinked PVOH (MW 22000)
    • PVOH (MW 22000), 10% succinic acid, HCl
    • PVOH (MW 22000), 10% maleic acid, HCl
    • Crosslinked PVOH (MW 22000), 10% succinic acid, HCl
    • Crosslinked PVOH (MW 22000), 10% maleic acid, HCl
    • Crosslinked PVOH (MW 22000), 15% succinic acid, H3PO4
    • Crosslinked PVOH (MW 22000), 15% maleic acid, H3PO4
  • The data will be uploaded next week.



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