ポリピロメリットイミドーアミドの合成
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概要
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Polypyromellitimide-amide polymer was prepared in two step reactions. Polypyromellitic acid hydrazide of high molecular weight was obtained when pyromellitic dianhydride was added to the dispersion of dicarboxylic acid dihy-drazide in dimethyl formamide, dimethyl acetamide, or dimethyl sulf oxide. The polymeric hydrazides, which were soluble in dimethyl formamide, dimethyl acetamide, dimethyl sulfoxide, and alkaline water, showed an inherent viscosity of 1.2-0.7. The solution was cast into essentially clear, flexible, and infusiblefilm. The polymer was amorphous as judged by X-ray diffraction patterns. The polypyromellitic acid hydrazide was then heated to form polypyromellitimide-amide. The cyclocondensation reaction of polypyromellitic acid-isophthalic hydrazide proceeds endothermally over the temperature range, 70-170°C as proven by differential thermal analysis as well as thermal decomposition studies. The polypyromellitic-isophthalic imide-amide can be wet-spun into fibers using an aqueous ethanol as a quenching liquid.
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