Do I have to calculate the solubility parameter of a polymer(Polyacrylonitrile) myself or can I use the data available for it in the Hansen Solubility Parameters: A User's Handbook. How should one plot and use the sphere for determining solubility?.
Dear Shashi Yadav,
For good solubilization the solubility parameters of both the solvent and the polymer should be as close as possible. To use available solubility data, choose the one that corresponds to a molecular weight equals or close to you PAN. Regards
Shashi, for determining experimentally which one is a good solvent, you take those solvents which are as close as possible with your PAN, and you take a low concentration (the lower, the higher the molecular weight is), try to find the concentration saturation concentration.
Then you measure particle size (Laser-Doppler or else).
Then you dilute - for a good solvent just below saturation concentration, the particle size should INCREASE, because the chains can move more freely.
If no change of the particle size, you probably have a too low concentration.
(2)
(2) then you take the same concentration as you determined to be the saturation concentration and test solvents whose solubility parameters are more and more distant from PAN.
You will find some which deliver relatively bis prticle size and no changes while diluting, some will only swell the polymer, and the further distant the solubility parameter, the less swelling will happen and finally nothing.
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