As i asked in the question statement, I observed a little amount of PP is soluble in cyclohexane.
If i want to prepare a 4 %w/w solution of PP in cyclohexane, it is obvious all of it will not be dissolved, how to remove the non dissolved PP entity from this solution and how to calculate the % w/w of remaining solution?
Is decalin a good solvent choice for electrospinning of PP?
Thanks.
Hello Salah Ud Din ,
the removal depends on the size of the non dissolved leftovers. Bigger polymer particles may be filtered from the polymer solution. For smaller particles, which might cause a turbidity but do not settle, you can try centrifugation. If you want to remove even smaller PP particles, you may try a syringe filter. Before injecting a polymer solution into the SEC setup in our lab, we normally filter our polymer solution. These filters can even remove dissolved polymers with molecular weights or a hydrodynamic radius, which is too big for their pore size.
For the determination of the weight fraction of dissolved PP, you can also try different methods: A simple one would be to take a fraction of your solution, weight it and let the cyclohexane evaporate and weight the leftover. You could also use some quantitative characterization method, such as NMR spectroscopy and compare the integrals of characteristic peaks.
Dear all, the solubilized fraction might be low MW and amorphous phase of PP. On the other side, the nonsolubilized part is the crystalline fraction. If you do fractionation, all features of the virgin PP are lost. So, my suggestion is to heat the solution in order to disturb the crystalline phase to allow solvent diffusion. Another suggestion is to do quenching of the melted PP to reduce crystals size and density, i. e., to produce highly amorphous PP. My Regards
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