I am trying to dissolve PAA of 1250 kDa (2 wt%). I kept it on the magnetic stirrer and left for 24 hours but still, I see some particles in swelled form. So, I need some suggestions whether only stirring is enough or some more things to do for its proper dissolution?
Partial or complete salts of PAA are more water soluble compared to the fully protonated form, if that is compatible with your research. A 1.25MDa PAA is huge, though, and solubility may be limited by its sheer size.
Dear all,
though you did not mentioned the solvent I suppose it is water. Weak acids (such as COOH) protonation are pH dependent, they are in the deprotonated form at arround 2.4 and below, so it becomes obvious that the dessolution is more efficient at higher pH. Regards
Hello Banani
polyacrylic acid is soluble in alcohols, dilute alkali, DMF, formamide, water,1-methyl-2-pyridine.
Regarding water, dissolution of polyacrylic acid increase with increasing temperature and pH. Having said that, please consider pH>7 and heating
Hope it helps
Amin
Thank you Allessandro and Abdelkader for your response.
Hello Amin, thanks for your reply, actually I have dissolved it in pH 7. So now I will check it with above this value and do you have any idea what is the optimized temperature range for this?
You have to pre disperse your Paaa into low amount of ethanol then add the slurry into a neutralised water bath at Ph 7,5 better if you are using Li OH or Nh4OH to increase pH to 7,5
Dear all,
becarefull in using alcohol as a solvent mainly at high temperature, esterfication may occur altering thus the basic structure of the homopolymer. Regards
Hello Mr. Amin Shavandi
Could you tell me the solubility of polyacryclic acid (PAA) in DMF. I tried to disolve 0.2 g PAA in 5 mL DMF, but I didn't see PAA soluble in DMF.
Dear Mr. Efkan Catiker,
I want to find a suitable sovent to dissolve 1-Dodecanol and PAA, I tend to do esterification reaction followed by steglich method. Hence, I think dissolve PAA in HCOOH is impossible.
this particle is acrylic acid hydrogels and you cannot dissolve them in any solvent. you should filter them.
when you heat PAA this gelation occur.
fully linear PAA dose not exist. so each PAA you have, consist of a little cross link part. temperature help to form cross linked PAA. crosslinked polymer not dissolve in solvent but swell in them. so you should dissolve PAA in water and filter swollen paticle.
if weight is important
you van dry filtrate then weight them and add excess amount of PAA to the solution.
good luck
Hello every one, i also graft gum arabic and PAA using ammonium persulfate as the initiator but after precipitating the hydrogels using acetone. i try to dissolve it in water but it forms a suspension that is partly dissolved. what exactly is consist on the suspension in the solution?
It dissolved in water as sonication and will be gelatin by heating
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