Mironov, V. S. Kim, J. K. Park, M. Lim, S. Cho, W. K. 2024-01-21T01:01:48Z 2024-01-21T01:01:48Z 2021-09-02 2007-06 0142-9418 https://pubs.kist.re.kr/handle/201004/134359 A comparison of the volume conductivity measured by standard four-electrode (FE) and four-point probe (FPP) methods for graphite-based powdery polypropylene (PP) and poly(vinylidene fluoride) (PVDF) composite bar specimens was made in this study. Significant difference in the conductivity data obtained by standard FE and FPP methods was found for highly conductive PP and PVDF composites which were molded from hybrid carbon/polymer powders dry-blended in a high-speed mixer and jar ball mill. However, it was found that the conductivity values were approximately equal for moderately conductive PVDF/graphite and PP/graphite composites. It was also shown that polishing the specimens to remove 100-150 mu m of the surface layer and decrease surface roughness did not bring about significant changes in conductivity values. Consequently, bulk non-uniformity and inhomogeneity of graphite-based polymer material were considered to be the most probable sources of the difference in the volume conductivity values measured by the FE and FPP methods. (C) 2007 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD Comparison of electrical conductivity data obtained by four-electrode and four-point probe methods for graphite-based polymer composites Article 10.1016/j.polymertesting.2007.02.003 1 POLYMER TESTING, v.26, no.4, pp.547 - 555 POLYMER TESTING 26 4 547 555 scie scopus 000247169800016 2-s2.0-34247871185 Materials Science, Characterization & Testing Polymer Science Materials Science Polymer Science Article graphite filler polymer composite volume electrical conductivity four-electrode method four-point probe method experimental measurement