User:Elizabeth Ghias/Notebook/Experimental Chemistry/2012/08/31

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Objective

To create crosslinked films through acid catalyzed dehydration and to perform viscosity tests.


Description

Film Preparation with Acid Dehydration

  • All films were prepared using PVA with a MW of 22,000

Film 1 - 0.5110 g PVA in 3 mL water, no acid was added

Film 2 - 0.5053 g PVA in 3 mL water, 2 drops of phosphoric acid was added

Film 3 - 0.5078 g PVA in 3 mL water, 2 drops of 12 M hydrochloric acid was added

Film 4 - 1.0084 g PVA in 6 mL water, no acid was added

Film 5 - 1.0010 g PVA in 6 mL water, 3 drops of phosphoric acid was added

Film 6 - 1.0044 g PVA in 6 mL water, 3 drops of 12 M hydrochloric acid was added


Viscosity Tests (Part 1)

The viscosity of the MW = 130,000 PVA and the MW = 22,000 PVA were measured.


MW = 130,000 PVA Solution Preparation

% wt/mL Calculated g/mL Mass Used Total Volume
2% wt/mL 0.02 g/mL 0.406 g 20 mL
1% wt/mL 0.01 g/mL 0.204 g 20 mL
0.5% wt/mL 0.005 g/mL 0.101 g 20 mL
0.2% wt/mL 0.002 g/mL 0.041 g 20 mL


  1. Approximately 10 mL of the first solution tested was poured into the viscometer.
  2. The time it took for the sample to travel between the two lines marked on the viscometer were recorded.
  3. The test was repeated 2 or 3 times for each sample
  4. After the first solution was removed, 10 mL of the next solution was added to the viscometer to rinse out the previous solution.
  5. Steps 1 - 4 were repeated for all of the remaining solutions.


Data

Viscosity Test Results (Part 1)

% wt/mL Time 1 Time 2 Time 3 Average Time
2% wt/mL 9.35s 9.48 s 9.51 9.45 s
1% wt/mL 6.46 s 6.16 s n/a 6.31 s
0.5% wt/mL 4.42 s 4.47 s n/a 4.445 s
0.2% wt/mL 4.09 s 4.11 s n/a 4.10 s


Notes

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