PVA forms precipitate in potassium sulphate solution. Is there a way to prepare a homogenous gel solution?
Thanks.
Use dimethyl sulfoxide as a solvent to form PVA gel with potassium sulphate.
Thanks for the information. Could you kindly send me the paper that describes the preparation of K2SO4/PVA gel electrolyte?
try to SEPARATE dissolution of PVA and K2SO4.
First dissolve PVA in solvent (ie hot water) beaker, in another beaker dissolve K2SO4. after complete dissolution for both, then mix it together. Stir again... then you can see the homogenous solution.
Thanks for the suggestion. Actually, we tried that approach before but PVA formed precipitation upon addition of K2SO4 solution.
You may try with aqua-organic solvent with larger %of organic solvent ,say, aqueous acetone .You have to optimize concentrations .
Ratio of salt and PVA (dissolution is based on its hydrolysis and the precipitation is strongly related to the interaction between cation and hydroxyl group) is a big concern. You cannot simply follow some literature, because some of them are difficult to repeat. Try to add less salt (i.e. lower ratio of salt and PVA), then precipitation can be avoided.
Good luck!
Dear Dr Guo-Ming Weng,
Thank you so much for the guidance. Yes, I do agree with you that the procedure mentioned in the literature is not producible.
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