Blends of polybenzimidazole (PBI) with either of two fluorine-containing polyimides were prepared by casting from solution and by precipitation. Dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC) were used to study miscibility in the two blend systems.
The blends of PBI with the first polyimide, the polysulfonimide Pl-1, consisted of a single phase when the blends contained less than 30 wt% Pl-1; above 50 wt% Pl-1, phase separation occurred even at room temperature. The PBI blends containing the second polyimide, Pl-2, were immiscible.
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Yamaoka, H., Aubrey, N.E., MAcknight, W.J. et al. Miscibiuty in Blends of Polybenzimidazole and Fluorine Containing Polyimides. MRS Online Proceedings Library 171, 197–202 (1989). https://doi.org/10.1557/PROC-171-197