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Thermal effects of heat‐resistant rubber blends. I. Joule heating effects in carbon black‐loaded NR/SBR blends
Author(s) -
Hassan H. H.,
AbdelBary E. M.,
Amin M.,
ElMansy M. K.,
Gouda M. E.
Publication year - 1990
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1990.070390907
Subject(s) - carbon black , natural rubber , materials science , composite material , electrical resistivity and conductivity , joule heating , styrene butadiene , temperature coefficient , electric field , styrene , polymer , electrical engineering , copolymer , physics , quantum mechanics , engineering
A heat‐resistant rubber blend of natural rubber NR and styrene butadiene rubber (SBR‐1502) was prepared according to the standard techniques. The rubber blend was loaded with different concentrations of LAMP black and general purpose furnace (GPF) black for obtaining conductive rubber composites. The obtained vulcanizates were subjected to electrical conductivity measurements over a wide range of temperature and electric field. It was found that all samples showed negative values of temperature coefficient of conductivity (TCC). The temperature developed inside the samples by the Joule heating effect was recorded as a function of time ( T–t ) at different values of the initial applied DC‐electric power. The T–t dependence was found to obey an exponentially growing function with a time constant (τ), which was found to be dependent on the concentrations as well as the type of carbon black and the value of the initial applied power. The current–voltage characteristics of the samples showed a negative resistance behavior after a characteristic voltage ( V * ). It was noticed that V * decreases as the carbon black concentration increases.