الفهرس 
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Abstract
The carried out in this worle allows us to conclude the following. The electrical conductivit o , of car bon blacJc loaded butyl rubber increases by adding 20 phr BaTiOs-ceramic
to rubber mixtures. In case temperature coefficient.
of conductivity (TCC] of’ corresponding samples decreases.
2. The decrease in due to Joule heating effect occurs as a
result. of’ the thermal expansion of’ the hopping paths
between carbon black particles and/or aggregates and is
comparable with the changes occured in due text rnal
heating.
3. Theoretical analysis of’ the obtained data allows to
calculate reasonable values of’ the specific heat of carbon
black-loaded butyl rubber composites. 4. The values of the time constants Tg and Td due sample
heaing and cooling respecively are characerisic
consanLs for each ype and concenLraion of carbon black
and varies from 2 LO 5 min.
5. By using ~he ftash method technique the value of the
specific heat of the composi~es are in good agreement with
that which obtained from time-temperature It-TJ characteristic curves.
6. Each ~ype of invest.igaLed carbon black possesses a
criticat concentration aL which a maximum value of heat
produced by Joule effect. was obtained; namely, HAY [80
phr J, GPF I60 phr J, SRF I100 phr J and LAMP I70 phr J ,
7. The heat capacity of bULyl rubber composites decreases as
the carbon black concentration increases.
8. Both the heat produced by Joule effect and the values
of ~he specific heat were found to bet markedly affected
by the ambient temperature. 9. The heat. produced by Joule heating effect. increases as
surface area to volume [S/¥) ratio of the sample increases.
10. The heat capacity of the investigated rubber composite
is equal to the summation of the heat capacities of
individual intredients and is governed by the rule of
addi ti vty
11. The electrical and thermal parameters of composites
containing 100 phr HAF. GPF. and SRF were not. markedly
affected after 6 months of continuous power onset
operation using the mains acpower source [50 Hz).