Objectives
- Prepare four dilute solutions from the stock solution of PVOH (MW 130,000), diluting by 0.75, 0.5, 0.25 and 0.125
- Measure the viscosity of PVOH (MW 130,000) at the concentrated stock solution and the four diluted concentrations
- 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:
- 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
- Add the wanted weight percent of either maleic or succinic acid
- Add ~2 drops of HCl or H3PO4
- (Note: HCl and H3PO4 are corrosive)
- 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 in fume hood
PVOH (MW 22,000) films prepared:
- The following were combined in small beakers with 3mL of H2O
- 0.5181g PVOH (MW 22,000), 10 wt% maleic acid(actual mass added was 0.0582g), 2 drops HCl
- 0.5163g PVOH (MW 22,000), 10 wt% succinic acid(actual mass added was 0.5173g), 2 drops HCl
- 1.0054g PVOH (MW 22,000), 15 wt% maleic acid(actual mass added was 0.1565g), 2 drops H3PO4
- 1.0g PVOJ (MW 22,000), 15 wt% succinic acid, 2 drops H3PO4
- An additional 2mL H2O
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