I am trying to dissolve PVA solution in an alkaline solution containing sodium hydroxide and sodium silicate. However, When I added a small drop of PVA solution (~10%) into this solution. it flocculation right away. As Far as I am concerned, Sodium ions play a role in flocculation. how can i suppress it?
can anyone help me to solve this problem
Please define your abbreviation. Is PVA Polyvinyl alcohol, Polyvinyl acetate?
Perhaps the mixture you attempt just isn't stable.
If it is it might help to create the solution by first dissolving PVA in the water and then add the sodium hydroxide and sodium silicate or creating two double strength solutions. One of sodium hydroxide and sodium silicate and the other of PVA before mixing 1:1.
Van At Nguyen
The process you are facing is called salting out. There are electrolytes that reduces solubility of water-soluble polymers (in your case). Others (salting in agents) increase solubility. To control the solubility of the polymer, you need to reduce the concentration of the salting out agent or increasing the concentration of the salting in agent.
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