✦ LIBER ✦

Preparation and properties of novel processable polyimides derived from N,N-bis(isocyanatoalkyl)-1,2,4,5-benzenetetracarboxylic-1,2:4,5-diimides

✍ Scribed by Hamid Yeganeh; Mehdi Barikani

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 114 KB
Volume: 49
Category: Article
ISSN: 0959-8103
DOI: 10.1002/1097-0126(200006)49:6<514::aid-pi397>3.0.co;2-2

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✦ Synopsis

Two diisocyanate monomers containing methylene groups and built-in imide structure have been prepared from the parent diacids via the Curtius±Weinstock rearrangement. Polyimides have been synthesized by solution polymerization of these isocyanates with pyromellitic dianhydride (PMDA), 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA), and hexa¯uoroisopropylidene-2,2-bis(phthalic-anhydride) (6FDA).

All monomers and polymers were characterized by conventional methods, and the physical properties of the polymers, including solution viscosity, solubility, thermal stability and thermal behaviour, were studied.

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