A new series of heteroaromatic polyazomethines
containing 1,8-naphthyridine moieties in the
polymer backbone were synthesized with a solution polycondensation
technique. A new heteroaromatic monomer
containing 1,8-naphthyridine moieties (4-ethoxy-2,7-dicarboxaldehyde-
1,8-naphthyridine) was synthesized with an
analogous synthetic sequence and confirmed by elemental
and spectral data. The resulting polymers were characterized
by elemental, spectral analyses, solubility and viscometry
measurements. All the synthesized polyazomethines
had better solubility in polar aportic solvents. The thermal
properties of those polymers were evaluated by thermogravimetric
analysis, differential thermogravimetry, and
differential thermal analysis measurements and correlated
to their structural units. All the polymers had nearly
similar maximum polymer decomposition temperatures,
which were in the range 557–577
C. A very large difference
between the glass transitions (92–222
C) was
observed. In addition, with gel permeation chromatography,
the molecular weight determination of selected examples
of those polymers was evaluated. The values of the
average molecular weight for polyazomethines 7b and 7c
were 34,914 and 24,859, respectively. On the other hand,
the biological screening of all of the synthesized polyazomethines
was performed in variety of bacteria and fungi.
Most of the polyazomethines showed a significant influence
against Gram-negative bacteria. The minimum inhibitory
concentration of the most active polymers was
0.05 mg/mL. VC 2012 Wiley Periodicals, Inc. J Appl Polym Sci
126: 2–12, 2012