Rubber composite materials with the effects of electromagnetic shielding

Abstract

This work deals with the preparation and properties evaluation of magnetic composites with acrylonitrile butadiene rubber matrix, which are able to shield electromagnetic radiation. In addition to the rubber matrix, these materials contained soft magnetic filler (Li or H40) and ingredients necessary for vulcanization process of prepared rubber compounds (sulfur, accelerator N‐cyclohexyl‐2‐benzothiazole sulfenamide, activators ZnO, and stearin). This study was aimed at the preparation of elastomeric composite materials and evaluation of the influence of ferrite weight fraction on curing characteristics, physical–mechanical, and magnetic properties. The results showed that with increasing content of filler, the moduli, and tensile strength decline. Conversely, elongation at break increased with increasing amount of filler. All composites containing 200 and more phr of ferrite showed sufficient absorption shielding properties, whereas lithium ferrite shows better shielding properties compared with manganese–zinc ferrite H40. POLYM. COMPOS., 37:2933–2939, 2016. © 2015 Society of Plastics Engineers

Rubber magnets based on NBR and lithium ferrite with the ability to absorb electromagnetic radiation

“…Based on the detection of RL, one can calculate how much incident EMR is absorbed by the shielding material. Through investigation using several experiments, it has been shown that materials with a RL of −10 dB are able to absorb 95% of the incident EMR . The prepared composites must therefore provide a RL of at least −10 dB and less to be sufficiently effective as EMR absorbers.…”

“…Nowadays, several works have been devoted to the preparation of polymer composites as effective materials to shield from harmful EMR . Preparation of rubber composites filled with lithium ferrite and evaluation of their properties have been a part of some other studies . The results showed that rubber magnetic composites are able to shield from EMR, although the frequency range of their absorption ability was quite narrow.…”

Correlation between Electrical Conductivity and Microwave Shielding Effectiveness of Natural Rubber Based Composites, Containing Different Hybrid Fillers Obtained by Impregnation Technology

“…Industrial furnace carbon black types PM-15 and PM-75 (produced in Russia with characteristics corresponding to those of carbon black types N 776 and N 330, respectively) and conductive carbon black Printex XE-2B (Orion Engineered Carbons GmbH) were used as substrates for production of the hybrid fillers. Silicasol (containing 40% of silica; pH-9; density 1.3 g/cm 3 ) was chosen as an impregnating agent due to A mixture of 100 g of furnace carbon black (PM-15 or PM-75) or Printex XE-2B carbon black and the needed amount of silicasol, corresponding to 3% or 7% of silica, was placed into a ball mill and 1.6 L of distilled water was poured over it. The impregnation and homogenization were run for 2 h. After the impregnation, the fillers with substrate PM-75 and PM-15 were dried at 50˚C for 30 min and then at 200˚C for 2…”

“…In the last years, a considerable number of studies investigated the application of rubber composite materials as EMI shields and radar absorbing materials [3]- [9]. In order to achieve high value of shielding effectiveness of conductive composites, non-conductive fillers such as SiO 2 , are used [10] [11].…”

Finite element simulation and analysis of the dielectric properties of unidirectional aramid/epoxy composites

“…In recent years, aramid fiber reinforced resin composites have been widely used as electromagnetic and lightweight functional materials because of their outstanding mechanical and dielectric performances . Wave‐transmitting material is one of the most common used forms of aramid/epoxy composites .…”