ISSN:
1572-8870
Keywords:
directional ruthenium polymers
;
2,2′-bipyridyl aramids
;
fluorescence
;
chelation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract High-performance polyamides containing the 4,4′-disubstituted-2,2′-bipyridyl moiety were synthesized by phosphorylation polycondensation from 2,2′-bipyridyl-4,4′-dicarboxylic acid and a series of primary aromatic diamines with triphenylphosphite and pyridine as the agents to facilitate condensation. Polyamides exhibiting improved solubility in organic solvents and strong acids, melting transitions at low temperatures, and good thermal properties were prepared by introducing bulking methyl and fluoro groups and flexible ether and propyl linkages and by using monomers with reduced symmetry. Solutions of the polyamides with rigid main chains (III, IV, V, VI, and VIII) showed birefringence (colorful spherulites) at concentrations of 5, 10, and 15% (w/v) polymer/solvent. The chelation of ruthenium(II) ions resulted in the preparation of directional metallopolyamide systems based on the geometrically favorable tris(2,2′-bipyridyl)ruthenium(II) complex. The three-dimensional polyamides, which absorbed at a λ max of 476 mm and emitted at a λ max of 620 nm, exhibited a high thermal stability and improved solubility, making them suitable candidates for compressive strength studies and cyclic voltammetry studies as part of an effort to address the corrosion of graphite fiber-reinforced composites.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1016694823829
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