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Effect of relaxation processes during deformation on electrical resistivity of carbon black polypropylene composites

https://doi.org/10.32362/2410-6593-2021-16-4-345-351

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Abstract

Objectives. To study the relationship between bending deformation and the change in the electrical resistance of carbon black polypropylene composites.
Methods. Conductive polypropylene composites filled with carbon black UM-76 were investigated. The samples were deformed and kept under constant bending at temperatures of 20–155 °C.
Results. The deformation of the samples led to a reversible increase in their electrical resistance, while subsequent holding of the samples in the deformed state was accompanied by an exponential drop in their electrical resistance. The average times and activation energies of the electrical relaxation of the deformed polypropylene composites were calculated (30–32 kJ/mol) and compared with similar characteristics of polyethylene composites (15–16 kJ/mol).
Conclusions. The electrical resistance relaxation of deformed carbon black polypropylene composites at elevated temperatures is similar to their stress relaxation. The average times and activation energies of the electrical relaxation of deformed polypropylene composites are comparable with similar data on their mechanical relaxation. It was found that these electrical and mechanical phenomena are based on the same underlying physical processes.

About the Authors

A. V. Markov
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies
Russian Federation

Anatoly V. Markov, Dr. Sci. (Eng.), Professor, Department of Chemistry and Technology of Plastic Processing and Polymer Composites, M.V. Lomonosov Institute of Fine Chemical Technologies

86, Vernadskogo pr., Moscow, 119571


Competing Interests:

The authors declare no conflicts of interest.



K. S. Tarasova
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies
Russian Federation

Kristina S. Tarasova, Master, Department of Chemistry and Technology of Plastic Processing and Polymer Composites, M.V. Lomonosov Institute of Fine Chemical Technologies

86, Vernadskogo pr., Moscow, 119571


Competing Interests:

The authors declare no conflicts of interest.



V. A. Markov
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies
Russian Federation

86, Vernadskogo pr., Moscow, 119571


Competing Interests:

The authors declare no conflicts of interest.



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Supplementary files

1. Dependence of the relative electric volume resistance (ρT/ρ20) of the polypropylene samples on temperature
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2. This is to certify that the paper titled Effect of relaxation processes during deformation on electrical resistivity of carbon black polypropylene composites commissioned to us by Аnatoly V. Markov, Katerina S. Tarasova, Vasily A. Markov has been edited for English language and spelling by Enago, an editing brand of Crimson Interactive Inc.
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  • Conductive polypropylene (PP) composites filled with carbon black were investigated. The samples were deformed and kept under constant bending at temperatures of 20–155℃.
  • Deformation of the samples led to a reversible increase in their electrical resistance, while subsequent holding of the samples in a deformed state was accompanied by an exponential drop in their electrical resistance.
  • The averaged times and activation energies of the electrical relaxation of the deformed PP composites were calculated and compared with similar characteristics of polyethylene composites.
  • The electrical resistance relaxation of the deformed carbon black PP composites, including that at elevated temperatures, was similar to their stress relaxation. The average times and activation energies of the electrical relaxation of the composites were comparable with similar indicators for mechanical relaxation.

For citation:


Markov A.V., Tarasova K.S., Markov V.A. Effect of relaxation processes during deformation on electrical resistivity of carbon black polypropylene composites. Fine Chemical Technologies. 2021;16(4):345-351. https://doi.org/10.32362/2410-6593-2021-16-4-345-351

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)