Aromatic tetracarboxylic dianhydride having crank and twisted noncoplanar structure, 2,2 -bis(3,4-dicarboxyphenoxy)-1,1 -binaphthyl dianhydride, was synthesized by the reaction of 4-nitrophthalonitrile with 2,2 -dihydroxy-1,1 -binaphthyl, followed by alkaline hydrolysis of the intermediate bis(ether
Synthesis and properties of fluorinated polyimides from 1,1-bis(4-amino-3,5-dimethylphenyl)-1-(3,4,5-trifluorophenyl)-2,2,2-trifluoroethane and various aromatic dianhydrides
โ Scribed by Xiao-Juan Zhao; Jin-Gang Liu; Hong-Shen Li; Lin Fan; Shi-Yong Yang
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 209 KB
- Volume
- 111
- Category
- Article
- ISSN
- 0021-8995
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Optically active 2,2ะ-bis(2-trifluoro-4-aminophenoxy)-1,1ะ-binaphthyl and its corresponding racemate were prepared by a nucleophilic substitution reaction of 1,1ะ-bi-2-naphthol with 2-chloro-5-nitrotrifluorotoluene and subsequently by the reduction of the resulting dinitro compounds. A series of opt
A new aromatic tetracarboxylic dianhydride having a crank and twisted noncoplannar structure, 2,2ะ-bis(3,4-dicarboxyphenoxy)biphenyl dianhydride, was synthesized by the reaction of 4-nitrophthalonitrile with biphenyl-2,2ะ-diol, followed by hydrolysis and cyclodehydration. The biphenyl-2,2ะ-diyl-cont
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