I am preparing solid polymer electrolyte using PVA as polymer. I am dissolving it in DMF at 60 C. But it is not getting dissloved from 6 hours strring....Kindly suggest me the solvent for PVA
You can dissolve PVA in water by heating the solution for several hours.
Is it polyvinyl alcohol? If yeas, What is the molecular weight of PVA?
It normally goes into water.
Although it is dependent on the molecular weight, it can be soluble into water.
PVA can be dissolved in water. This solution is kept at 60 °C to 70 °C for 3 h.
This is the most effective way I found to dissolve PVA in water:
1) Add PVA pellets/grains to cold water under strong stirring, in order to wet the solid polymer and avoid deposits and flocculation.
2) Increase the water temperature up to 90°C-95°C, keep strong mixing.
3) Allow 30-180min to completely dissolve the PVA. At the end you will obtain a transparent, homogeneous, viscous solution.
Best thing is to use a reactor with oil bath or jacket, mechanical mixing and a condenser. Avoid direct heating on a plate.
Time and conditions vary according to the MW and the degree of hydrolysis. Lower hydrolysis grade (up to 80%) are easier to dissolve. Water is definitely the best solvent I have experienced. You can reach 30%wt concentration in hot conditions with moderate MW-grades.
PVA is soluble in water and in methanol. Of course dependent on the molecular weigh of the polymeric material.
Water solubility of PVA depends not only on molecular weight but also on the degree of hydrolysis (PVA is polivinyl acetate partially hydrollized)
PVA is soluble in water methanol mixture at a temperature ranging from 60 to 80 degrees centigrade.
water is a goog solvent. I use 93k da. It goes pretty well at 80degree celcicus
As mentioned by others water is the best solvent. If you are keen with DMF, Use DMF/Water (80/20 or 90/10 v/v) to get better result.
You might find this useful. Regards
Chetri, P., Nath Dass, N., & Sen Sarma, N. (2008). DEVELOPMENT OF A CATALYST FOR SOLUTION OF POLY(VINYL ALCOHOL) IN NON-AQUEOUS MEDIUM. Chinese Journal of Polymer Science 399−404 Chinese Journal of Polymer Science, 26(4).
I used water at 60-70 degreeC, and simple DMSO works just as well at same temperature.
water is a best solvent with well dissolved at 800C to 90 0C @ stirrer RPM 700-800
water is the best solvent for PVA. Add PVA into cold water and stir strongly. Then heat 70-80 C for a few hours
I had dissolved PVA in hot water (70-80 deg. cen.) and stirred for 3 h to get a homogeneous solution.
I used water as solvent for PVA, I stirrered it for 3 h and 600 RPM then I increased the temperature to 90 deg (145000 Mw.). after 2-3 h I had a homogeneous solution.
Try water or dimethyl sulfoxide at various temperature starting from 80 deg and stir intermittently.
One can dissolve PVA in a mixed solvent mixture of DMF and water in 1:1 ratio by volume.
PVA can be ultrasonically dissolved in water at 80 °C for 60 to 90 min.
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