User:Allison K. Alix/Notebook/CHEM-581/2012/09/14
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In Situ cross-linking of polyvinyl alcohol films
0.1g of polyvinyl alochol film (0.5 g in 6mL H2O) treated with gluteraldehyde was placed in a solution containing 100mL water, 2mL HCl, and 20g Na2SO4 @ 70 degrees celsius. The sodium sulfate is added to decrease solubility of the polymer during the acetalization reaction. The polymer film was immersed in solution with stirring for 1 hour. The film was then rinsed with water and immersed in a 1% HCl solution @ 70 degrees celsius for 1/2 hour. It was then transferred to a 0.2M solution of sodium bicarbonate for 15 minutes, to neutralize the HCl from the previous solution.
See NASA Technical Paper 1407