PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LX 2020

Galyna MARTYNІUK1, Olena AKSIMENTYEVA2

1Rivne State Humanities University, Plastova st., 31в, 33000 Rivne, Ukraine. e-mail: galmart@ukr.net

2Ivan Franko National University of Lviv, Kyryla i Mefodiya Str., 6, 79005 Lviv, Ukraine. e-mail: aksimen@ukr.net

DOI: https://doi.org/10.37827/ntsh.chem.2020.60.014

INFLUENCE OF CONDUCTIVE POLYMER FILLER ON ELECTRICAL CONDUCTIVITY AND MICROHARDNESS OF COMPOSITES WITH DIELECTRIC POLYMERIC MATRICES

Nowadays special attention is given to the so-called “smart-materials” or “intellectual” materials, which have the ability to purposefully change their physical and physical-chemical properties depending on changing external conditions. Conductive conjugated polymers–polyaniline (РАNi) and its derivatives may alter their properties in response to external action–exhibit sensory sensitivity, electrochromic, thermochromic and solvatochromic effects. When creating РАNi composites with industrial polymer matrices, an important issue is to determine the physical and mechanical properties, in particular, the microhardness as a material strength characteristic. The composite samples were obtained by the method of thermal pressing of highly dispersed powders of the conductive polymers dispersed in the polymer matrices. The mechanical properties of the composites were studied by the method of measuring microhardness and boundary microhardness on a Heppler consistometer. The determination of the electrical conductivity of the composites in the molded samples was determined by the standard 2-contact method at a temperature T = 293 K.
The influence of the acid doped polyaniline (РАNi) as a conductive polymer filler on the microhardness of composites with polymer matrices of different structure (polyvinyl alcohol (PVA), polymethyl methacrylate (PMMA), polybuthyl methacrylate (PBMA), epoxy resin ED-20) was studied. It is found that the nature of the interaction between the polymer matrix and the conductive polymer filler depends on its content and the structure of the matrix, which is manifested in the growth of microhardness for composites PBMA–РАNi and ED-20−РАNi and its reduction for composites PVA–РАNi at the contents of the filler 5−20 %.
The dielectric polymer matrix preserves the properties inherent in both high polymers (high elasticity, thermoplasticity) and the semiconductor nature of the electrical conductivity inherent in the conjugated polymers. The value of the specific conductivity of the composites obtained well correlated with changes in microhardness, which is a confirmation of the enhancing or loosening nature of the interaction between the polymer matrix and the conductive polymeric filler.

Keywords: dielectric polymeric matrices, conductive polymer filler, polyaniline, microhardness

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How to Cite

Martynіuk G., Aksimentyeva O. INFLUENCE OF CONDUCTIVE POLYMER FILLER ON ELECTRICAL CONDUCTIVITY AND MICROHARDNESS OF COMPOSITES WITH DIELECTRIC POLYMERIC MATRICES Proc. Shevchenko Sci. Soc. Chem. Sci. 2020 Vol. LX. P. 14-21.

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