Intrinsically colored wholly aromatic polyamides (aramids)

This work describes the preparation of intrinsically blue-colored, high-performance aromatic polyamides (aramids). The color was achieved by preparing a diamine monomer containing a chromogenic azadipyrromethene (ADPM) core, which after polymerizing it with commercially available m-phenyleneisophtahlamide and isophthaloyl chloride gave the blue-colored polyisophthalamide copolymers. These materials were structurally compared to commercialized and high-value-added meta-aramid fibers [poly(m-phenyleneisophthalamide), MPIA, brand names: NOMEX® and Teijinconex®]. Blue is the highest demanded color in the market of protective aramid fibers. The coloration efficiency of this special monomer is very high. Furthermore, the aramids showed even better thermal properties than commercial MPIA.

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