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Licensed Unlicensed Requires Authentication Published by De Gruyter September 12, 2013

Effect of processing technology on the morphological, mechanical and electrical properties of conductive polymer composites

  • Anett Király and Ferenc Ronkay EMAIL logo


Conducting carbon/polypropylene (PP) and carbon/poly(butylene terephthalate) (PBT) composites containing crystalline natural graphite and carbon black (CB) were prepared by compression and injection molding. The effect of the processing technology on the electrical, mechanical, and morphological properties was investigated. Determination of the constant torque at the end of the mixing process and differential scanning calorimetric (DSC) measurements showed that graphite had better connectivity with the more polar matrix (PBT) than with the less polar one (PP). Scanning electron microscopy (SEM) studies showed that compression molding results in a homogeneous structure, while injection molding results in a skin-core structure with different orientations. Layered electrical conductivity studies showed that the electrical conductivity of the compression molded samples did not change along the thickness of the sample, while that of the injection molded samples changed throughout the material, which is due to the different structures developed with each type of processing.

Corresponding author: Ferenc Ronkay, Faculty of Mechanical Engineering, Department of Polymer Engineering, Budapest University of Technology and Economics, H-1111 Budapest, Műegyetem rkp. 3, Hungary, e-mail:

This work is related to the scientific program of the “Development of quality-oriented and harmonized R+D+I strategy and functional model at BME” project. This project is supported by the New Széchenyi Plan (grant number: TÁMOP-4.2.1/B-09/1/KMR-2010-0002) and Mobility and Environment: Studies in the fields of motor vehicle industry, energetics and environment in the Middle- and West-Transdanubian Regions of Hungary (grant number: TAMOP-4.2.1/B-09/1/KONV-2010-0003). This project is supported by the European Union and co-financed by the European Regional Development Fund. The work reported in this paper has been developed in the framework of the project “Talent care and cultivation in the scientific workshops of BME” project (grant number: TÁMOP – 4.2.2.B-10/1--2010-0009).


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Received: 2013-2-23
Accepted: 2013-8-15
Published Online: 2013-09-12
Published in Print: 2013-11-01

©2013 by Walter de Gruyter Berlin Boston

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