Author(s):
1. Miomir Pavlović, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
2. M. M. Pavlović, University of Belgrade, ICTM-CMM, , Serbia
3. V. Ćosović, University of Belgrade, ICTM-CMM, , Serbia
4. Z. Janković, V&Z-Zaštita, d.o.o. Banja Luka, Republic of Srpska, Bosnia and Herzegovina
5. J. Stajić-Trošić, University of Belgrade, ICTM-CMM, , Serbia

Abstract:
Composite materials are gaining increasing industrial applications worldwide. Composites based on polymers with conductive fillers have been recently in the wider research focus primarily because of their growing importance from the point of application. Natural polymers based on renewable materials with selected fillers can be used directly as contemporary materials in: electronics, medicine, industry, as contact conductive materials, electromagnetic and radio wave shields, photothermal optical recorders, electronic noses sensitive to certain chemicals, as well as economically acceptable catalysts. In this manuscript the results of experimental studies of the properties of composite materials based on lignocellulosic matrix (LC) filled with electrolytic copper powder and chemically obtained silver powder are presented. Volume fractions of metal fillers in the composite materials in tested samples were varied in the range of 1.6-30% (v/v), and the samples were prepared by compression – cold pressing. Characterization included examination of the influence of particle size and morphology on the conductivity and percolation threshold of the composites using variety of testing techniques: SEM, TGA, DSC, particle size distribution and conductivity measurements. Thermal analysis of the prepared composites showed the improvement of the thermal characteristics of the composites. This was due to the presence of the metallic fillers which are very good thermal conductors, hence accumulating the emitted heat during TGA measurements primary to lignocellulosic matrix. On the other hand, there is no difference in the response with different metallic fillers and particles with different morphologies. Glass transition temperature is improved by 20 ºC for all the composites.

Key words:
thermal analysis, composite materials, lignocellulose, DSC, TGA

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
16.06.2015.

Conference:
Contemporary Materials 2015 - Savremeni Materijali

Abstract