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Preparation and properties of aromatic polyamides and aromatic polyesters derived from 4,4′-sulfonyldibenzoic acid

1990; Wiley; Volume: 28; Issue: 3 Linguagem: Inglês

10.1002/pola.1990.080280302

1099-0518

Hiroshi Manami, Mikio Nakazawa, Yoshiyuki Oishi, Masa‐aki Kakimoto, Yoshio Imai,

Synthesis and Reactivity of Sulfur-Containing Compounds

Abstract Aromatic polyamides (aramids) having inherent viscosities of 0.3–1.6 dL/g were prepared by the direct polycondensation of 4,4′‐sulfonyldibenzoic acid with various aromatic diamines using triphenyl phosphite and pyridine as condensing agents. Aromatic polyesters (polyarylates) with inherent viscosities of 0.3–1.2 dL/g were prepared by the phase‐transfer catalyzed, two‐phase polycondensation of 4,4′‐sulfonyldibenzoyl chloride with various bisphenols. Most of the aramids and some polyarylates were soluble in a variety of solvents such as dimethylacetamide, N ‐methyl‐2‐pyrrolidone, and m ‐cresol, and afforded transparent, flexible, and tough films from the polymer solutions. The aramids and the polyarylates had glass transition temperatures in the range of 200–350 and 260–310°C, respectively. These polymers containing sulfonyl group did not lose weight below 350°C, with 10% weight loss being recorded above 430°C in air.