Synthesis Of Polyaniline Substituted Dyes And The Study Of Their Electrical Conductivity

Polyaniline substituted azo dyes were synthesized from polyaniline obtained by oxidative polymerization of aniline and different azo dyes obtained from 2-aminothiophene intermediates. Four different polyaniline substituted dyes were synthesized and there molecular weight ranges from 58044-58128gmol. The melting point was observed to span from 286C-319C. The FT-IR bands of polyaniline substituted dyes showed absorption peaks in the range 3213.0-3242.8cm-1 due to the presence of an amino group the benzenoid and quinoid rings for all the polyaniline substituted dyes showed in the range 1461-1487cm-1 and 1543-1595cm-1 respectively while the carbon nitrogen single bond C-N absorption were found in the range 1263.6-1285cm-1. The electrical conductivity measurements were obtained by employing a standard process using a programmable LCR meter at a frequency range of 200-100000Hz and the result was determined for polyaniline to be 5.957 x 10-3 S m-1. Thus electrical conductivity of synthesized dyes were observed to be within the range of 10-7-10-8 S m-1 while polyaniline substituted dyes lies within the range of 10-2-10-4 S m-1. The electrical conductivity of the dyes and polyanaline substituted dyes lies within the range of electrical conductivity for semiconductor which is between 10 12 102 S m-1.