New aromatic tetracarboxylic dianhydride, having isopropylidene and bromo-substituted arylene ether structure 3,3Ј,5,5Ј-tetrabromo-2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride, was synthesized by the reaction of 4-nitrophthalonitrile with 3,3Ј,5,5Ј-tetrabromobisphenol A, followed by al
Organo-soluble polyimides: synthesis and polymerization of 2,2′-disubstituted-4,4′,5,5′-biphenyltetracarboxylic dianhydrides
✍ Scribed by Frank W. Harris; Sheng-Hsien Lin; Fuming Li; Stephen Z.D. Cheng
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 871 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0032-3861
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4,4Ј-Diamino-3,3Ј-dimethyldiphenylmethane was used to prepare polyimides in an attempt to achieve good organo-solubility and light color. Polyimides based on this diamine and three conventional aromatic dianhydrides were prepared by solution polycondensation followed by chemical imidization. They po
Tg's were obtained by differential scanning calorimetry (DSC) (Rigakudenki thermal analyzer 8055D1) and Td's by TG-DTA (Rigakudenki 8075D1). IR spectra were recorded on a Hitachi 270-30 spectrophotometer.
## Abstract Thermal rearrangement of 3‐acylisoxazole arylhydrazones allowed facile preparation of 2__H__‐1,2,3‐triazoles which were firstly reacted with isoamyl nitrite and then with an opportune arylhydrazine to produce the corresponding α‐hydroxyiminohydrazones **8a‐h**. The reaction of compounds