Synthesis and characterization of aromatic polyesteres and polyamide–esters from bisphenols and aromatic aminophenols, and 2,5‐bis(4‐chloroformyl)‐3,4‐diphenylthiophene

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Abstract
Polycondensation of 2,5‐bis(4‐chloroformyl)‐3,4‐diphenylthiophene (I) with various bisphenols afforded tetraphenylthiophene‐containing aromatic polyesters by the interfacial or solution polycondensation method. Polyamide–esters were obtained from I and aminophenols by means of the interfacial technique. These polymers had inherent viscosities of 0.4–0.8 dL/g. All the polymers were readily soluble in various organic solvents, and could be cast into transparent and flexible films. Their glass transition temperatures were in the range of 235–335°C. These polymers did not lose weight below 400°C in either air or nitrogen.

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