Abstract
Abstract2‐(4‐Carboxyphenyl)‐5‐hydroxybenzoxazole was obtained by a multi‐step synthesis starting from commercial 2,5‐dimethoxyaniline. Its homopolyester as well as its copolyester with 4‐hydroxybenzoic acid were prepared by polycondensation of the acetyl derivatives in an inert, liquid reaction medium at temperatures of 320, 350 or 400°C. The resulting polyesters are highly crystalline (>90% crystallinity), infusible and isoluble materials. They were characterized by elemental analyses, IR spectroscopy, WAXS and DSC measurements, and electron microscopy. The WAXS powder patterns show that the benzoxazole monomer does not fit well into the crystal modification 1 of poly(4‐hydroxybenzoic acid). Whisker‐type single crystals were obtained only when the 4‐oxybenzoate units represent 90% of the copolyesters. Polycondensations of monomers having silylated carboxyl groups did not yield better results.
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