Abstract
Binary thermotropic fully aromatic copolyesters based on 4-hydroxybenzoic and 4'-hydroxybiphenyl-4-carboxylic acids and ternary copolyesters of 4-hydroxybenzoic, 4'-hydroxybiphenyl-4-carboxylic, and 3‑hydroxybenzoic acids containing 60–80% of 4-hydroxybenzoic acid units are synthesized by the melt polycondensation of corresponding acetyl derivatives. The melting temperature of the copolyesters is below 400°С, and the most promising among them melt at temperatures below 340°С which allows their melt processing by extrusion, molding, and injection molding. The tensile properties of some copolyesters are comparable with the corresponding mechanical properties of such commercially available analogs as Vectra A‑950 and Zenite HX-8000. All the synthesized copolyesters are stable in an inert atmosphere at least up to 450°С. The thermal stability of the copolyesters slightly decreases with an increase in the content of 3‑hydroxybenzoic acid units.
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This work was performed within the framework of State Assignment for Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences.
This work was supported by the Russian Science Foundation (project no. 17-79-30108).
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Mikhaylov, P.A., Kalita, A.G. & Kulichikhin, V.G. Synthesis of New Thermotropic Fully Aromatic Copolyesters from Hydroxybenzoic and Hydroxybiphenylcarboxylic Acids. Polym. Sci. Ser. B 64, 393–401 (2022). https://doi.org/10.1134/S1560090422700282
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DOI: https://doi.org/10.1134/S1560090422700282