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Synthesis of aromatic polythioamide-oxothioxoquinazolines from bis(1,3,4-thiadiazoline-5-thione) and aromatic bis-o-amino esters

✍ Scribed by Saegusa, Yasuo ;Iida, Sakayu ;Nakamura, Shigeo ;Chau, Nguyen ;Iwakura, Yoshio

Publisher
John Wiley and Sons
Year
1984
Weight
346 KB
Volume
22
Category
Article
ISSN
0360-6376

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✦ Synopsis

Abstract

Aromatic polythioamide‐oxothioxoquinazolines were synthesized by the polycondensation of 2,2′‐(m‐phenylene)bis‐1,3,4‐thiadiazoline‐5‐thione with aromatic bis‐o‐amino esters. The polymerizations were carried out at 160°C in acidic media such as m‐cresol, sulfolane, and polyphosphoric acid to produce polymers with reduced viscosities up to 0.5 dL/g. These polymers were soluble in polar aprotic solvents like N‐methyl‐2‐pyrrolidone and some acidic media including m‐cresol. The polythioamide‐oxothioxoquinazolines showed relatively good thermal stability with 10% weight loss at 344–394°C in air.

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