Abstract
AbstractPolycondensation in polyphosphoric acid of 2,5‐diamino‐1,4‐benzene dithiol dihydrochloride with bicyclo[2.2.2]octane‐1,4‐dicarboxylic acid, as well as the corresponding dimethyl ester or diacid chloride, led to rigid‐rod benzobisthiazole polymers. Colorless and soluble polymers with intrinsic viscosities as high as 30.6 dL/g (methanesulfonic acid, 30°C) were obtained. The ultraviolet‐visible spectrum of a polymer film cast from methanesulfonic acid under reduced pressure displayed no absorptions in the visible range (400–900 °m). The polymer was thermooxidatively stable up to 420°C in air as determined by thermogravimetric analysis. Fibers spun from a lyotropic polyphosphoric acid solution exhibited a tensile strength of 300–450 Ksi, a modulus of 26 Msi, and a compressive strength of 53 Ksi. Wide‐angle X‐ray scattering patterns of polymer fibers indicated a 3‐dimensional crystal structure rather than a nematic liquid crystal structure. © 1994 John Wiley & Sons, Inc.
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