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Synthesis and characterization of formal‐group‐containing diisocyanates and polyimides therefrom
Author(s) -
Avadhani C. V.,
Wadgaonkar P. P.,
Vernekar S. P.
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070450803
Subject(s) - pyromellitic dianhydride , dimethylacetamide , polymer chemistry , curtius rearrangement , thermogravimetric analysis , materials science , formal group , polyimide , organic chemistry , chemistry , mathematics , layer (electronics) , solvent , pure mathematics
Four new formal‐group‐containing diisocyanates, namely, bis(3‐isocyanatophenoxy) methane, bis(4‐isocyanatophenoxy)methane, bis[2‐(3‐isocyanatophenoxy)ethyl] formal, and bis[2‐(4‐isocyanatophenoxy)ethyl] formal, were synthesized by the Curtius rearrangement from the corresponding dicarboxylic acids. The diisocyanates were polycondensed with pyromellitic dianhydride (PMDA) and benzophenonetetracarboxylic dianhydride (BTDA) in dimethylacetamide (DMAc) to obtain formal‐group‐containing polyimides. These polyimides were characterized by viscosity measurements, IR spectroscopy, X‐ray diffraction, and thermogravimetric analysis.