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            <title xml:lang="en">Charge Transport of Hydrochloric Acid Doped Polyaniline and Poly(o-toluidine) Fibers: Role of Processing</title>
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                <forename type="first">Y.Z.</forename>
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            <idno type="halRefHtml">&lt;i&gt;Macromolecules&lt;/i&gt;, 1994, 27 (20), pp.5871-5876. &lt;a target="_blank" href="https://dx.doi.org/10.1021/ma00098a047"&gt;&amp;#x27E8;10.1021/ma00098a047&amp;#x27E9;&lt;/a&gt;</idno>
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            <idno type="stamp" n="UNIV-PSUD">Université Paris Sud - Paris XI</idno>
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                <title xml:lang="en">Charge Transport of Hydrochloric Acid Doped Polyaniline and Poly(o-toluidine) Fibers: Role of Processing</title>
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                    <forename type="first">J.P.</forename>
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                    <forename type="first">A.J.</forename>
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                <term xml:lang="en">Polyaniline</term>
                <term xml:lang="en">Aromatic polymers</term>
                <term xml:lang="en">Crystal structure</term>
                <term xml:lang="en">Derivatives</term>
                <term xml:lang="en">Dielectric properties</term>
                <term xml:lang="en">Doping (additives)</term>
                <term xml:lang="en">Electric conductivity measurement</term>
                <term xml:lang="en">Electron transport properties</term>
                <term xml:lang="en">Conductive plastics</term>
                <term xml:lang="en">Thermoelectric power</term>
                <term xml:lang="en">Hydrochloric acid</term>
                <term xml:lang="en">Poly(o toluidine)</term>
                <term xml:lang="en">Microwave frequency conductivity</term>
                <term xml:lang="en">Localization</term>
                <term xml:lang="en">Interrupted metallic strands model</term>
                <term xml:lang="en">Dielectric constant</term>
                <term xml:lang="en">Crystallinity</term>
                <term xml:lang="en">Charge transfer</term>
                <term xml:lang="en">Thermal effects</term>
                <term xml:lang="en">Stretching</term>
                <term xml:lang="en">Plastic filaments</term>
                <term xml:lang="en">Mathematical models</term>
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              <p>We report the results of transport (temperature dependent dc conductivity, thermoelectric power, and microwave frequency conductivity, and dielectric constant) and structural studies for hydrochloric acid doped polyaniline (PAN-HCl) fibers 4-fold stretched at 300, 350, and 400 °C and the results of dc conductivity for its methyl ring-substituted derivative, poly(o-toluidine) (POT-HCl) fibers. For the PAN-HCl fibers,with increasing stretching temperatures, the system shows greater localization, as indicated by the decreasing conductivity with stronger temperature dependence and decreasing microwave dielectric constant with weaker temperature dependence. This is in accord with the observed decreasing crystallinity with increasing processing temperature. The interrupted metallic strands model is used to account for the microwave results assuming that the size of the metallic regions increases linearly with temperature. For the POT-HCl fiber, the conductivity is similar to that for the POT-HCl powder. When the fiber is stretched 3-fold, the conductivity increases almost 1 order of magnitude while the temperature dependence changes only slightly, in agreement with the short localization length in the system.</p>
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