Electrical and mechanical properties of manganese dioxide–magnetite-filled acrylonitrile butadiene rubber blends. (May 2016)

• Record Type: Journal Article
• Authors: El-Nemr, KF; Balboul, MR; Ali, MA
• Is Part Of: Journal of thermoplastic composite materials. Volume 29:Number 5(2016:Jun.)
• Page Start: 704
• Page End: 716
• Publication Date: 2016-05
• Subjects: Acrylonitrile butadiene rubber -- cross-linking -- electrical properties -- mechanical properties; Thermoplastic composites -- Periodicals; 668.423
• DOI: 10.1177/0892705714533372
• Languages: English
• ISSNs: 0892-7057

Abstract

Different concentrations of fillers such as manganese dioxide (MnO2 ) and magnetite (Fe3 O4 ) were incorporated into acrylonitrile butadiene rubber (NBR)-interlinked composites. The prepared composite systems were irradiated by electrons at a constant dose of 50 kGy to induce radiation cross-linking under atmospheric conditions. The effect of different contents of fillers and temperature variations on direct current (DC) electrical conductivity, σ DC, in NBR/MnO2 and NBR/Fe3 O4 mixture systems was investigated. The calculated activation energy, Δ E DC, from σ DC was found to be highly affected by both the type and concentration of the fillers, while the dielectric properties namely dielectric constant, dielectric loss, and the alternating current (AC) electrical conductivity ( σ AC ), were measured as functions of frequency and temperature and for different filler concentrations of MnO2 and Fe3 O4 . The σ AC value was calculated from dielectric measurements and by employing a simple relationship. The analysis of the σ AC results shows that the conductivity increases up to a temperature of about 330 K. Further increase of temperature reduces the conductivity of Fe3 O4 samples, while the conductivity of MnO2 samples tends to show almost constant values after this temperature. Mechanical properties, tensile strength (TS), tensile modulus at 100% elongation, and hardness were established as a function of different concentrations of fillers MnO2 and Fe3 O4 . It was found that filler incorporation into the NBR matrix is one of the major factors that enhance the TS as well as hardness resistance, while the elongation at break shows an adverse behavior by increasing the content of MnO2 and Fe3 O4 fillers.