Why Do Polystyrene, d-Limonene, and Isobutane Not Form a Homogeneous Mixture?

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SUMMARY

The discussion focuses on the incompatibility of Polystyrene, d-Limonene, and Isobutane in forming a homogeneous mixture. d-Limonene effectively dissolves Polystyrene, and Liquid Isobutane mixes with d-Limonene; however, when combined with Polystyrene, the latter separates from the solution. This phenomenon is attributed to molecular size and intermolecular forces, specifically van der Waals and Heitler-London forces, which hinder the formation of a stable mixture. The user seeks a polymer that remains soluble in liquid Isobutane, indicating a gap in available compatible materials.

PREREQUISITES
  • Understanding of polymer chemistry, specifically the solubility of polymers.
  • Knowledge of intermolecular forces, including van der Waals and Heitler-London forces.
  • Familiarity with the properties of d-Limonene and Isobutane as solvents.
  • Basic principles of solution chemistry and phase separation.
NEXT STEPS
  • Research polymers that are known to be soluble in Isobutane.
  • Investigate the effects of molecular weight on solubility and mixture stability.
  • Explore alternative solvents that can maintain a homogeneous mixture with Polystyrene.
  • Study the principles of phase separation in polymer solutions and their implications in material science.
USEFUL FOR

Chemists, material scientists, and engineers involved in polymer formulation and solvent selection, particularly those working with hydrocarbon-based solvents and polymers.

PRIDES
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Ok, I am really close to this.
d-Limonene dissolves Polystyrene (I have tested this)
and Liquid Isobutane mixes with d-Limonene (I have also tested this)
However, when I mix all three together, the Polystyrene becomes completely separated from the solution.
Same thing with all polymer solutions I try to mix with Isobutane, the polymer ceases to be dissolved.
Is this simply a matter of proportions, or is there something more I need to notice?
Preferably I just need some kind of polymer that is soluble in liquid isobutane, but I don't think that exists.
Is there some kind of mixture that will stay homogenous that consists of isobutane, a solvent, and a polymer?
 
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You have just met the incompatible molecular size/weight/dimension problem compounded by small vdW/Heitler-London/dispersion forces between molecules.
 

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