Abstract
According to specific formulas, the mixing of rubber samples occurs by two methods: open mixing and internal mixing. The effects of frequency, mixing process, carbon black (CB) content, zinc oxide (ZnO) content, and stearic acid (SA) content on the dielectric properties of rubber materials were studied. The results showed that the effects of the mixing process on the dielectric properties of the rubber samples cannot be ignored, and the appropriate mixing process should be selected when preparing the required rubber materials. The dielectric constant and loss factor of the rubber samples vary depending on the frequency. The dielectric constant had a peak and valley value, while the loss factor only had a peak. The dielectric constant and loss factor of rubber samples were significantly affected by the content of CB, ZnO, and SA. The peak frequency decreased with the increase in CB content, however, the dielectric constant increased with an increase in CB content. The higher the ZnO content, the lower the peak frequency. In addition, the dielectric constant and loss factor increased with an increase in ZnO content. The higher the SA content, the greater the peak frequency. In addition, the dielectric constant and loss factor decreased with an increase in SA content. It is hoped that the experimental results obtained can provide guidance for the study of the dielectric properties, microwave absorption properties, and microwave heating characteristics of rubber polymers.
Highlights
Rubber materials are widely used in important fields such as military defense, aerospace, and transportation
Different dielectric properties will lead to different microwave heating temperature distribution and heating efficiency, in addition, the distribution of the microwave heating temperature is important to ensure the good performance of rubber products [1,2]
In order to carry out the experiment, firstly, the raw materials and equipment for the experiment were prepared, and the rubber samples were prepared by the mixing processes according to the rubber mixing formulas
Summary
Rubber materials are widely used in important fields such as military defense, aerospace, and transportation. Carbon nanotubes have good electrical and microwave absorbing properties, so they have attracted the attention of materials science and technology workers. Carbon nanotubes are used as fillers to improve the dielectric properties, electromagnetic shielding performance, and wave absorbing properties of polymer materials [16–19]. In addition to carbon nanotubes, graphene has attracted the attention of some scholars due to its excellent thermal, electrical, and microwave absorbing properties, and graphene is used as a filler to improve the dielectric properties and microwave absorbing properties of polymer materials [20–22]. In order to obtain the good performance of DEAs, the dielectric properties of polymer composites, especially the dielectric constant, are not negligible research objects [27,28]. The dielectric constants of the rubber samples within a certain microwave frequency range were measured, and the effects of the mixing processes on the dielectric properties of the rubber samples were studied. The effects of the CB content, ZnO content, and SA content on the dielectric constant and loss factor were studied
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