The room temperature electrical conductivities of pristine polyaniline (PAn
i), its blend with PMMA (polymethylmethacrylate) in the ratio 2:3 and PAni
extracted from the blend were found to be 18, 29 and 73 S/cm, respectively.
The temperature dependence of conductivity was also found to differ marked
ly: for the extract and the blends it is weakly temperature dependent over
the interval 300-1.2 K. Reduced activation energy versus temperature plots
showed that, while the unblended PAni is on the insulating side of the M-I
transition, the blends and the extracted PAni are on the metallic side. The
magneto-conductivity (MC) of the extracted PAni is discussed in terms of l
ocalization and Coulomb interaction effects. (C) 2000 Elsevier Science B.V.
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