Dear Mosfera,

1% is 1g in 100 mL.

Therefore, weigh 1 gram of PVA, dissolve this amount in 50 mL water, transfer the solution to 100 mL volumetric flask, and add water up to 100 mL.

Good luck,

Rafik

Thanks Rafik.

Can I use the solution right after preparation or I need to add some other chemicals (eg., HCl or Tris-Borate etc) with that for functioning properly. I never used PVA before and found the chemicals in bracket in several journal paper. 

Dear Mosfera,

You can use it right away.

Best wishes,

Rafik

Thank you so much.

Good luck to you too!

Mosfera

Dear Mosfera,

You should also heat your solution to 95 degree to be able to dissolve all the crystalites of your polymer,

BTW the time you should stir depend on the molecular weight you use for your PVA, I attached here a document for mowiol use which is a commercial PVA.

Best wishes,

Alex

Dear all,

the dissolution of any polymer in a given solvent is time (diffusion) and molecular weight dependant (the higher the MW the higher time should be). This means that dissolution is not instantaneous, so it is not really advisible to use your polymer just after preparation; even if it looks clear solution, down to the resolution of our eyes things still undissolved. Generally you leave the solution overnight. Regards

You need to use hot water ... it is very simple to dissolve PVA. Just try this...Alexandre gave a very good direction..

As prof. Mohini Sain mentioned, PVA is soluble in water at elevated temperature.

You could try dissolving in boiling water.

Thank you sao much for all these helpful information.

@Michael Pach: I will try to use borate. Thanks :)

dissolve 1 g in 100 ml water and heat at 90 C with magnetic stirrer

dissolve 1 g in 100 ml water and heat wit magnetic stirrer up to 90 C

Weigh out 1g of the PVA and dissolved in a 100ml water and stir using magnetic stirrer

1% could be 1% by volume or 1% by mass. This is not defined.

If we get to 100 mL of final solution then (by volume) 1 mL of PVA needs to be diluted in 99 mL of water (to make 100 mL total - Lewis's final concentration is 1/101 and thus not 1% w/v...). However, if there's volume change then this isn't the most appropriate way - here the comment of Rafik is applicable (dissolve 1 mL or 1 g in 50 mL and make up to 100 mL in a standard flask)

I agree with Alan F Rawle

Put it in the refrigerator. You need to get the temperature below the "lower critical solution temperature" which is about 33C for PVA.

Sure, you can heat it but why? Thermodynamics says No!

(I've demonstrated this to people who didn't believe me - now they do)