Abstract
The discovery of new polymeric alloys by blending commercially available polymers is an exciting trend in materials development. The ability to tailor existing materials to a new /unique set of property /performance /price specifications through combinations of materials is the key reason for this growth. Recently, various miscible blends based on Hoechst Celanese's polybenzimidazole ( PBI ) and commercially available polyimides (PI) were di~covered.'-~ Blend miscibility was evidenced in the form of changes in IR spectra, single Tg's, and well-defined single tan 6 relaxations. The intermolecular interaction involving the =NH and carbonyl groups was the major driving force for the miscibility. We therefore conducted a program focused on the fabrication of high-performance blend fibers based on PBI. After a thorough investigation, we found that PBI not only has superior thermal / chemical properties, but also exhibits unique reactivity that enables it to interact with other functionalized polar molecules and to possibly form compatible binary system^.^^^ As a result of PBIs reactivity, the molecular interactions between PBI and polyarylate ( PA) polymers have recently been discovered at Hoechst Celanese Research Division? In this paper we present information regarding the assessment of PBI/PA compatibility, the preparation /characterizations of solution and blend film, as well as the development of PBI/PA fibers.
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