Conclusions
Owing to the exceedingly small intermolecular forces in perfluoropolymers, their solubility is dominated by entropy effects. Enthalpic interactions almost always decrease solubility because they tend to favor solvent-solvent mixing. Solution melting and crystallization temperatures have been observed to decrease with lower solvent molar volume, lower undiluted polymer melting point, cyclic perfluorocarbons, low solvent polarity, low pressure, and low polymer concentration. Maximizing solvent density by increasing pressure or solvent MW favors solubility by increasing the LCST temperature. Solution stability also increases with polymer concentration.
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Tuminello, W.H. (2002). Solubility of Poly(Tetrafluoroethylene) and its Copolymers. In: Hougham, G., Cassidy, P.E., Johns, K., Davidson, T. (eds) Fluoropolymers 2. Topics in Applied Chemistry. Springer, Boston, MA. https://doi.org/10.1007/0-306-46919-7_8
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DOI: https://doi.org/10.1007/0-306-46919-7_8
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