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Electrical and thermal properties of γ‐irradiated nitrile rubber/rice husk ash composites
Author(s) -
Mohamed Rasha M.,
Radwan Reda M.,
AbdelAziz Mohamed M.,
Khattab Magdy M.
Publication year - 2009
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.31158
Subject(s) - materials science , composite material , thermal stability , thermogravimetric analysis , husk , irradiation , natural rubber , acrylonitrile , dielectric , fumed silica , nitrile rubber , dielectric loss , filler (materials) , electrical resistivity and conductivity , polymer , chemical engineering , electrical engineering , botany , physics , optoelectronics , nuclear physics , engineering , copolymer , biology
The effects of both the rice husk ash (RHA) loading and fumed silica (FS) loading on the structure, thermal stability, and electrical properties of acrylonitrile–butadiene rubber (NBR) composites were studied. The filler loading were chosen to be 5 and 20 phr for RHA and 5 and 30 phr for silica. Also, the effect of the γ‐irradiation dose (25 kGy) on these parameters was investigated. The structure and thermal stability were studied with X‐ray diffraction and thermogravimetric analysis techniques. Furthermore, some electrical parameters, such as the direct‐current electrical conductivity (σ dc ), activation energy ( E a ), dielectric constant (ϵ′), and dielectric loss (ϵ″), were determined. The incorporation of both RHA and FS resulted in improved thermal stability after γ irradiation at 25 kGy. The loading of FS on NBR was shown to decrease σ dc , ϵ′, and ϵ″ and increase E a . On the other hand, the loading of RHA showed the opposite trend. Finally, γ irradiation of NBR composites filled with both fillers decreased the values of σ dc , ϵ′, and ϵ″ for all the samples, which followed the trend for the unirradiated composites. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010