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Synthesis of polyamide-quinazolinediones from 2,2′-disubstituted bis(1,3,4-oxadiazolin-5-ones) and aromatic bis-o-amino esters

✍ Scribed by Chau, Nguyen ;Saegusa, Yasuo ;Iwakura, Yoshio

Publisher
John Wiley and Sons
Year
1982
Weight
491 KB
Volume
20
Category
Article
ISSN
0360-6376

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✦ Synopsis

Abstract

A novel class of polyamide‐quinazolinediones was synthesized by the polymerization of 2,2′‐disubstituted bis(1,3,4‐oxadiazolin‐5‐ones) with aromatic bis‐o‐amino esters in m‐cresol. The polymerization probably proceeded in the formation of ring‐opening adducts, which in turn were cyclized by the elimination of alcohol to give polyamide–quinazolinediones. These polymers, which were soluble in polar aprotic solvents such as dimethylformamide, dimethylacetamide, N‐methyl‐2‐pyrrolidone, and dimethyl sulfoxide, had, with one exception, reduced viscosities in the range of 0.12–0.32 dL/g. Thermogravimetric analyses indicated that they began to decompose at 310–360°C in air.

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Synthesis of aromatic polythioamide-oxot
Synthesis of aromatic polythioamide-oxothioxoquinazolines from bis(1,3,4-thiadiazoline-5-thione) and aromatic bis-o-amino esters
✍ Saegusa, Yasuo ;Iida, Sakayu ;Nakamura, Shigeo ;Chau, Nguyen ;Iwakura, Yoshio 📂 Article 📅 1984 🏛 John Wiley and Sons ⚖ 346 KB

## 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 polyph