User:Elizabeth Ghias/Notebook/Experimental Chemistry/2013/02/01

Objective

To calculate the number of OH groups in polyvinyl alcohol (MW = 146000 - 186000) and to prepare PVOH films

Description

OH Group Calculations

Isopropyl Solution Preparation<u>

<u>Films Prepared

All films were heated on a hot plate until the PVOH dissolved in the water. For films 5,6, and 7, additional water was added to the gel to assist in the dissolution. Once dissolved, the film was removed from heat and any additional reagents were added while the gel was stirred. When isopropyl and glutaraldehyde were added, the isopropyl would be added first and then would stir for roughly 2 to 3 minutes. Glutaraldehyde was added last. Once prepared, the films were poured into a large plastic dish and were allowed to evaporate over the weekend.

1. 0.5043 g PVOH + 6 mL water (this was the only small film prepared)
2. 0.5027 g PVOH + 6 mL water + 1 mL glutaraldehyde
3. 0.5029 g PVOH + 6 mL water + 87 μL isopropyl stock solution + 1 mL glutaraldehyde
4. 0.5029 g PVOH + 6 mL water + 87 μL 10% isopropyl solution (see notes) + 1 mL glutaraldehyde
5. 0.5060 g PVOH + 6 mL water + 87 μL 1% isopropyl solution + 1 mL glutaraldehyde
6. 0.5034 g PVOH + 6 mL water + 87 μL 0.1% isopropyl solution + 1 mL glutaraldehyde
7. 0.5050 g PVOH + 6 mL water

Data

• No data was collected today

Notes

• The 10% isopropyl solution refers to a solution that is 10% of the isopropyl stock solution. Similarily, a 1% or 0.1% solution refers to 1% and 0.1% of the stock solution, respectively.