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Polyimides from 1,5-bis(4-amino-2-trifluoromethylphenoxy)naphthalene and aromatic tetracarboxylic dianhydrides
- Source :
- European Polymer Journal. 40:1063-1074
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 2004.
-
Abstract
- A new trifluoromethylated bis(ether amine), 1,5-bis(4-amino-2-trifluoromethylphenoxy)naphthalene, was synthesized in two steps starting from 1,5-dihydroxynaphthalene and 2-chloro-5-nitrobenzotrifluoride via nucleophilic aromatic substitution and catalytic reduction. A series of novel fluorinated polyimides with moderate to high molecular weights were synthesized from the diamine with various aromatic tetracarboxylic dianhydrides using a conventional two-stage process. All polyimides could afford flexible and tough films and most of them were soluble in strong polar solvents such as N-methyl-2-pyrrolidone (NMP) and N,N-dimethylacetamide (DMAc). The polyimides showed glass-transition temperatures (Tg) in the range of 253–315 °C (by DSC) and softening temperatures (Ts) in the range of 250–300 °C (by TMA). Decomposition temperatures for 5% weight loss all occurred above 500 °C in both air and nitrogen atmospheres. The dielectric constants of these polymers ranged from 3.17 to 3.64 at 1 MHz. The properties of these fluorinated polyimides were also compared with those of polyimides prepared from 1,5-bis(4-aminophenoxy)naphthalene with the same dianhydrides.
- Subjects :
- chemistry.chemical_classification
Polymers and Plastics
Organic Chemistry
General Physics and Astronomy
Ether
Polymer
chemistry.chemical_compound
chemistry
Nucleophilic aromatic substitution
Diamine
Polymer chemistry
Materials Chemistry
Amine gas treating
Thermal stability
Polyimide
Naphthalene
Subjects
Details
- ISSN :
- 00143057
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- European Polymer Journal
- Accession number :
- edsair.doi...........53bcfcf1e2eb3aa59c71b2807450a403