Error message

  • Deprecated function: Unparenthesized `a ? b : c ? d : e` is deprecated. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` in include_once() (line 1439 of /home/science2016/public_html/includes/bootstrap.inc).
  • Deprecated function: Array and string offset access syntax with curly braces is deprecated in include_once() (line 3557 of /home/science2016/public_html/includes/bootstrap.inc).

Structuring and Electric Conductivity of Polymer Composites Pyrolysed at High Temperatures

Jimsher Aneli1, Timur Natriashvili1 and Gennady Zaikov2
Affiliation: 
1Institute of Machine Mechanics 10, Mindeli str., 0186 Tbilisi, Republic Georgia; jimaneli@yahoo.com 2N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 4, Kosygin str., 119334 Moscow, Russia
DOI: 
https://doi.org/10.23939/chcht09.03.301
AttachmentSize
PDF icon full_text.pdf423.4 KB

Keywords:

Abstract: 
On the basis of mixes of phenolformaldehide and epoxy resins at the presence of some silicon organic compounds and fiber glasses annealed in vacuum and hydrogen media the new conductive monolithic materials have been created. Conductive, magnetic and some other properties of these materials were investigated. It was established experimentally that the obtained products are characterized by semiconductive properties, the level of conductivity and conductive type of which are regulated by selection of technological methods. The density and mobility of carriers increase at increasing of annealing temperature up to definite levels. The temperature dependence of the electrical conductivity and charge mobility were described by Mott formulas. The magnetic properties of the annealed materials were investigated by ESR method. It was established that at annealing free radicals and other paramagnetic centers are formed. On the basis of the obtained results it was proposed that formation of conducting clusters and the charge transport between them is provided by mechanism of charge jumping with alternative longevity of the jump.
References: 

[1] Jampolskii Y.: Doct. thesis, Institute of Chem. Phys., Moscow 1981.

[2] Enzel P. and Bein T.: Chem. Mat., 1992, 4, 819.
https://doi.org/10.1021/cm00022a014

[3] Aneli J., Khananashvili L. and Zaikov G.: Structuring and Conductivity of Polymer Composites, Nova Sci. Publ. New York 1998.

[4] Aviles M., Gines J., Del Rio J. et al.: J. Thermal Analysis and Calorimetry, 2002, 67, 177.
https://doi.org/10.1023/A:1013706501882

[5] Milinchuk V., Klinshpont E. and Pshezhetskii S.: Macroradicaly. Khimia, Moskwa 1980.

[6] Ingram D.: Free Radicals as Studied by ESR. Butterworths Sci. Publ., London 1958.

[7] Fialkov A.: Uglerod-Grafitnye Materialy. Energia, Moskwa 1979.

[8] Osugi J. and Hara K.: Rev. Phys. Chem. Jap., 1966, 36, 81.

[9] Kajiwara T., Inokuchi H. and Minomura S.: Jap. Plast. Age, 1974, 12,17.

[10] Shklovskii B. and Efros A.: Electronnye Svoistva Splavlennykh Poluprovodnikov. Nauka, Moskwa 1979.

[11] Shklovskii B. and Efros A.: Uspekhi Phyz. Nauk, 1975, 117, 36.

[12] Mott N. and Davis E.: Electron Processes in Noncrystalline Materials, 2nd edn. Clarendon Press, Oxford 1979.

[13] Dyson F.: Phys. Rev., 1955, 98, 349.
https://doi.org/10.1103/PhysRev.98.349