Development of novel functional conducting elastomer blends containing butyl rubber and low-density polyethylene for current switching, temperature sensor, and EMI shielding effectiveness applications

• Published in: Journal of applied polymer science Vol. 97; no. 3; pp. 1125 - 1138
• Main Author: El-Tantawy, Farid
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.08.2005; Wiley
• Subjects: Application fields; Applied sciences; butyl rubber; current switching; electromagnetic interference shielding; Exact sciences and technology; low-density polyethylene blend; microstructure; Polymer industry, paints, wood; stability; Technology of polymers; temperature sensor; Conducting material; Butyl rubber; Electrical conductivity; microstructure; Molecular structure; Crosslink density; Electromagnetic shielding; Composite material; Property formulation relationship; Thermal stability; Low density ethylene polymer; Vulcanizate; Thermoelectric power; Olefin polymer; stability; current switching; low-density polyethylene blend; Electrical switching; Polymer blends; Carbon black; Electrical properties; electromagnetic interference shielding; Dielectric properties; Mechanical properties; Temperature sensor; Experimental study; Polymer filler interaction; Thermal properties; Shielding effect; Morphology; Fabrication structure relation; Application
• ISSN: 0021-8995; 1097-4628; 1097-4682
• DOI: 10.1002/app.21778

A new class of functional conductive butyl rubber (IIR) with different loadings of low‐density polyethylene (PE) was prepared by roll mixing in a milling at a rotor speed of 24 rpm. To understand the filler dispersion and filler/matrix interaction, the network structure of the specimens was examined by evaluating of the crosslinking density, volume fraction of elastomer, interparticle distance among conductive phases, interfacial area per unit volume, torque rheometer, hardness, tensile strength, elongation at break, X‐ray, glass transition temperature, thermal gravemetry, differential scanning calorimetry, degree of crystallinity, and SEM microanalysis. Static conductivity, mobility carrier's concentration, number of charge carriers, and thermoelectric power as a function of PE content were investigated. The temperature dependence of the electrical conductivity as well as the conduction mechanism of IIR–PE blends were also analyzed. The isothermal resistance stability test was examined by displaying the resistance–time curve at certain temperatures. The relationship between current and DC applied voltage was measured for all samples. The self‐electrical heater with PE content of 10 wt % exhibited the highest nonlinearity. The thermal stability was tested by means of temperature–time curve at certain applied power, on and off, for two cycles. Dielectric constant and relative loss factor of the blends are reported. The applicability of the rubber system for switching current, temperature sensor, and electromagnetic shielding effectiveness (EMI) was examined. The experimental results of EMI were compared with theoretical predictions. The results of the present study indicate that these blends are suitable for switching current, temperature‐sensitive sensor, and EMI shielding effectiveness applications with good thermal stability for consumer products. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1125–1138, 2005