## Abstract Novel soluble polyimides containing perylene units have been synthesized. The polymers were prepared in a one‐step polycondensation reaction from 1,6,7,12‐tetrakis(4‐__tert__‐butylphenoxy)‐3,4:9,10‐perylenedianhydride and aliphatic and aromatic diamines. The amorphous polyimides have a
Polyimides containing 4,4′-bipyridinium units
✍ Scribed by C. Gaina; V. Gaina; A. Airinei; E. Avram
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 172 KB
- Volume
- 94
- Category
- Article
- ISSN
- 0021-8995
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Aliphatic polyimides containing adamantyl units (APIs) were prepared by the poly(addition/condensation) of a dianhydride bicyclo[2.2.2]octane-2,3,5,6-tetracarboxylic 2,3 : 5,6-dianhydride with a rigid diamine, 1,3-diaminoadamantane or 3,3Јdiamino-1,1Ј-biadamantyl, and a flexible diamine, 4,4Ј-methyl
A conformational analysis of the 4,4'-bipyridinium dication has been investigated using the results from 10 ab initio STO-3G calculations in which the inter-ring bond length was optimized at each torsion angle. The most reliable calculation yields: a lowest energy conformer with an equilibrium torsi