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polyimides containing s-triazine rings in the main chain: Synthesis and characterization

✍ Scribed by Bhimrao D. Sarwade; Prakash P. Wadgaonkar; Sudhakar S. Mahajan

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
256 KB
Volume
30
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

Eight s‐triazine‐containing polyimides were synthesized by solution polycondensation of diisocyanates having an s‐triazine ring with pyromellitic dianhydride in dimethylacetamide. Polyimides derived from meta‐oriented diisocyanates were amorphous and soluble in dipolar aprotic solvents while those based on para‐oriented diisocyanates were semicrystalline and insoluble in organic solvents. However, all the polyimides were soluble in concentrated sulphuric acid. The polyimides showed similar patterns of decomposition with no weight loss below 300Β°C in air.

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