Abstract
The phase diagrams of solutions in molten antimony trichloride of card-like polypyromellitimides and polynaphthylimides having fluorene, phthalide and anthrone side groups have been studied. It has been found that a phase diagram with a eutectic is characteristic of the three systems: anilineflourene polypyromellitimide-SbCl 3; anilinephthalein polypyromellitimide-SbCl 3; and anilinephthalein polynaphthylimide-SbCl 3. Only a single liquidus branch, corresponding to the reduction in the melting point of SbCl 3, is observed for both the polyimides with anthrone rings. Polarized light optical observations and a study of the low angle scattering of polarized light give evidence that spherulites are formed during the phase separation of solutions of anilinefluorene polypyromellitimide and anilinephthalein polynaphthylimide in SbCl 3 and, in the case of the system anilinephthalein polypyromellitimide in SbCl 3, unordered anisotropic rods are formed.
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