Dear Foroogh Khodadadi

I don't work with polymers, but rather with high-temperature oxide systems. Regardless, I would suggest that you use the Gibbs phase rule to guide your selection of compositions for generating data for a ternary system. It can save significant experimental effort. Assuming specifically selected temperature and pressure, you only need to select a single composition to cover an entire 3-phase region, and a series of points for a 2-phase region. You can use the paper by Wildu Malan as an example ( Article Phase equilibria and thermodynamic evaluation of the Fe-Ti-V...

Kind regards

Johan

Dear Johan Zietsman

Thank you so much for your reply.

I attached a diagram to clarify what I have to prepare. Based on the diagram, I have to prepare some solutions Polymer/Solvent/additives and add the water as the non-solvent to these solutions before occurring phase inversion.

Polymer weight in the solution (gram)

Solvent weight in the solution (gram)

Non-solvent weight in the solution (gram)

In some references, the researchers keep the Polymer/Additive weight ratio constant, for example, Polymer/Additive=30 times in weight. How they choose this ratio? Is it based on the best formulation? Then, they increase the polymer weight percent from 1 to MAX wt% that they can, for example, 20wt%.

Finally, they have 3 columns of weight data. Am I right?

So how many solutions I have to prepare?

And I am investigating the effect of additive on the ternary phase diagram situation, how can I keep the additive weight percent constant?

Regards

Dear Foroogh Khodadadi

I assume that you will try to determine the coordinates of the curve marked "Bimodal" with your experiments. This is also called the "liquidus" curve. This curve separates a 1-phase region to its left from a 2-phase region to its right. You need to do your experiments in the 2-phase region, which should have 1 degree of freedom at constant temperature and pressure.

Select a point A in the 2-phase region on the Solvent-Nonsolvent axis, and another point B in the 2-phase region on the Polymer-Nonsolvent axis. You should try to have 80-20 distributions between the ogranic and nonsolvent phases to make analytical work easier. The line A-B connecting these two points indicates the compositions that you should be testing. Select however many points you need to adequately trace the Bimodal curve. The compositions of the organic phase in your experiments will give you the coordinates of the Bimodal curve.

Kind regards

Johan

Dear Johan Zietsman,

Thank you so much for your time and help. I greatly appreciate it.

Regards