Influence of modified sericite on the properties and structure of polytetrafluoroethylene
https://doi.org/10.31242/2618-9712-2020-25-2-12
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Abstract
This paper presents the results of the investigation of polytetrafluoroethylene (PTFE) modification with mineral silicate (sericite) and its effect on the physicomechanical, tribotechnical properties and structural parameters. Two methods were used to develop a polymer composite material (PCM): mechanical and thermal activation of natural silicate before mixing with the polymer. It was shown that PTFE filled with thermally activated sericite is characterized by higher physicomechanical and tribotechnical parameters in comparison with the composites containing mechanically activated filler. By means of X-ray diffraction analysis, it was found that the modification of PTFE with mechanically activated sericite leads to an increase in the degree of crystallinity of PCM, and the use of thermally activated filler is accompanied by a decrease in crystallinity. A correlation between the degree of crystallinity and the average crystallite size of the composites was revealed, depending on the filler content. IR spectroscopy established the occurrence of tribochemical reactions during the frictional contact of the composites with the counterbody, contributing to the formation of a surface layer localizing shear deformations and protecting the material from wear.
Supporting agencies: This research was funded by the Ministry of Science and Higher Education of the Russian Federation (grant numbers [FSRG-2020-0017]).
About the Authors
A. P. Vasilev
North-Eastern Federal University named after M. K. Ammosov
Russian Federation
Russian Federation
VASILEV Andrey Petrovich, leading engineer, Institute of Natural Sciences
677000, Yakutsk, 58 Belinsky str.
A. A. Okhlopkova
North-Eastern Federal University named after M. K. Ammosov
Russian Federation
Russian Federation
OKHLOPKOVA Aitalina Alekseevna, doctor of technical sciences, professor, chief researcher at the Laboratory of Technologies of Polymer Nanocomposites, Institute of Natural Science
677000, Yakutsk, 58 Belinsky str.,
T. S. Struchkova
North-Eastern Federal University named after M. K. Ammosov
Russian Federation
Russian Federation
STRUCHKOVA Tatiana Semenovna, candidate of technical sciences, associate professor of the Chemical
Department, Institute of Natural Sciences
677000, Yakutsk, 58 Belinsky str.
A. G. Alekseev
North-Eastern Federal University named after M. K. Ammosov
Russian Federation
Russian Federation
ALEKSEEV Aleksey Gavrilievich, senior lecturer at the Chemical Department, Institute of Natural Sciences
677000, Yakutsk, 58 Belinsky str.
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Review
For citations:
Vasilev A.P., Okhlopkova A.A., Struchkova T.S., Alekseev A.G. Influence of modified sericite on the properties and structure of polytetrafluoroethylene. Arctic and Subarctic Natural Resources. 2020;25(2):147-156. (In Russ.) https://doi.org/10.31242/2618-9712-2020-25-2-12
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ISSN 2686-9683 (Online)
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