Abstract
New diphenylfluorene-based aromatic polyazomethines were synthesized via polycondensation of aromatic diamines with aromatic dialdehydes. The highest inherent viscosity of polyazomethines was obtained for solution polycondensation in m-cresol at room temperature under reduced pressure. The aromatic polyazomethines have inherent viscosities of 0.26–0.36 dL/g. All the polyazomethines are amorphous and most of them are highly soluble in various organic solvents, especially in tetrahydrofuran. Their glass transition temperatures (Tg) range from 249 to 335°C, and the temperatures of 10% weight loss are as high as 490∼535°C in air, indicating that these aromatic polyazomethines have high Tg and excellent thermal stability.
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