Lee, JY Song, KT Kim, SY Kim, YC Kim, DY Kim, CY 2024-01-21T19:05:34Z 2024-01-21T19:05:34Z 2021-09-04 1997-01 0379-6779 https://pubs.kist.re.kr/handle/201004/144167 Soluble polypyrrole(PPy) was synthesized chemically by using ammonium persulfate and dodecylbenzene sulfonic acid as an oxidant and a dopant, respectively. It was found that the soluble PPy powder as well as the cast film contained a high concentration of free radicals detected by an electron paramagnetic resonance spectrometer. The polymer solution was cast into a film with a very fine reflective surface. A thin film with the light transmittance fo 80% showed the surface resistivity of 25 k Omega/square displaying an increase in the resistivity only by 20 k Omega/square compared to the resistivity of a thick film. DC conductivity of the PPy film fitted nicely the quasi-one-dimensional variable range hopping model. The bulk electrical conductivity of the cast film increased by one order during initial heating to 200 degrees C in air and changed little during isothermal heating at 200 degrees C for 120 minutes. The conductivity kept a half of the initial increase after cooling from 200 degrees C to room temperature. The surface resistivity of the film, however, was found to increase dramatically on heating at 200 degrees C in air. Since the surface resistivity showed no change on heating in nitrogen atmosphere at 200 degrees C, oxidation during heating caused the decrease in the conductivity of the polymer. English ELSEVIER SCIENCE SA LAUSANNE Synthesis and characterization of soluble polypyrrole Article 10.1016/S0379-6779(97)80683-2 1 SYNTHETIC METALS, v.84, no.1-3, pp.137 - 140 SYNTHETIC METALS 84 1-3 137 140 N scie scopus A1997WW43100050 2-s2.0-0030709903 Materials Science, Multidisciplinary Physics, Condensed Matter Polymer Science Materials Science Physics Polymer Science Article; Proceedings Paper POLYACETYLENE CONDUCTIVITY POLYANILINE soluble polypyrrole free radical oxidation