𝔖 Bobbio Scriptorium
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Preparation of some new polybenzimidazoquinazolines

✍ Scribed by Saga, M. ;Hachihama, M. ;Shono, T.

Book ID
104535428
Publisher
Wiley (John Wiley & Sons)
Year
1970
Tongue
English
Weight
400 KB
Volume
8
Category
Article
ISSN
0449-296X

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✦ Synopsis

Abstract

Several new types of polybenzimidazoquinazolines with a different recurring unit have been prepared by solution polycondensation in polyphosphoric acid followed by heating at elevated temperature under reduced pressure. The polymers thus obtained were light yellow to brown powdery materials hardly soluble in common organic solvents and soluble in concentrated sulfuric acid. The inherent viscosity of the polymers ranged from 0.1 to 0.58 and showed good thermal stability.

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