I'm working on photopolymerization on Whatman No.1 chromatography paper.
I printed a circle using a toner laser printer and heated it inside the oven at 180 degrees Celsius for 1 hour to create the hydrophobic wax barrier.
After that, I tested the wax barrier with a few solutions:
1. Water
2. Schiff Reagent
3. Triethanolamine (TEA)
4. Triethanolamine (TEA) + Water
5. Poly(ethylene glycol) diacrylate (PEGDA)
6. Poly(ethylene glycol) diacrylate (PEGDA) + Water
1st to 4th solution did create a contact angle of more than 90 degrees, which showed that it didn't spread outside the wax barrier.
However, for the fifth and sixth solutions, it spread outside the hydrophobic wax barriers in just a few seconds time.
May I know why is this happening?
What can do to make sure the PEGDA solution didn't spread out?
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