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Synthesis and characterization of new diphenylfluorene-based aromatic polyamides derived from 9,9-bis[4-(4-carboxy-phenoxy)phenyl]fluorene
- Source :
- Macromolecular Chemistry and Physics; June 1999, Vol. 200 Issue: 6 p1428-1433, 6p
- Publication Year :
- 1999
-
Abstract
- A new bis(ether-carboxylic acid), 9,9-bis[4-(4-carboxyphenoxy)phenyl]fluorene (3), was synthesized from the nucleophilic fluorodisplacement of p-fluorobenzonitrile with the dipotassium bisphenolate of 9,9-bis(4-hydroxyphenyl)fluorene, followed by alkaline hydrolysis of the intermediate bis(ether nitrile). A novel series of aromatic polyamides containing ether and bulky fluorenylidene groups were prepared by the direct polycondensation of the diacid 3 with various aromatic diamines in N-methyl-2-pyrrolidone (NMP) solution containing dissolved CaCl<INF>2</INF> using triphenyl phosphite and pyridine as condensing agents. The obtained polyamides have inherent viscosities in the range of 0.501.75 dL/g. All the polymers are readily soluble in a variety of organic solvents, such as NMP, N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), and m-cresol, and afford transparent, flexible, and tough films by solvent casting. These polyamides have glass transition temperatures ranging from 200 to 303°C and show no significant weight loss up to 450°C, with 10% weight loss being recorded above 511°C in nitrogen or air.
Details
- Language :
- English
- ISSN :
- 10221352 and 15213935
- Volume :
- 200
- Issue :
- 6
- Database :
- Supplemental Index
- Journal :
- Macromolecular Chemistry and Physics
- Publication Type :
- Periodical
- Accession number :
- ejs2352253
- Full Text :
- https://doi.org/10.1002/(SICI)1521-3935(19990601)200:6<1428::AID-MACP1428>3.0.CO;2-J