What is the conductive mechanism of conductive EVA materials?

Conductive EVA material is an EVA (ethylene vinyl acetate) material that has conductive properties by adding conductive fillers. Conductive fillers are usually carbon black, conductive fibers, conductive oxides, etc.

The conductive mechanism of conductive EVA materials includes two aspects: basic conductive mechanism and conductive network formation mechanism.

The basic conductive mechanism mainly involves electronic conduction between conductive fillers and EVA matrix. In conductive EVA materials, conductive fillers form a composite system with the EVA matrix. Conductive fillers have high electronic conductivity. When the filler particles come into contact with the EVA matrix, free electrons in the conductive filler can conduct conduction between the conductive filler and the conductive filler. In this way, electrons can freely flow in conductive EVA materials, thereby achieving conductivity.

The conductivity of conductive fillers is related to their morphology. Generally speaking, the conductive effect of conductive filler morphology is superior to that of conductive filler particle morphology. The conductivity of conductive fillers is determined by the structure and connection method of their conductive particles. The structure of conductive particles includes two aspects: crystal structure and morphological structure. Crystal structure refers to the crystal structure of conductive fibers or particles in electrical fillers. The morphology and structure guide the arrangement and distribution of conductive particles in electrical fillers.

The formation mechanism of conductive networks is the determining factor of the conductivity of conductive EVA materials. The electronic conduction between the conductive filler and the EVA matrix forms a conductive network. The formation of a conductive network requires certain contact and connection between conductive fillers, and the formation of a three-dimensional connected electronic conduction channel. The formation of conductive networks is influenced by factors such as the conductivity of conductive fillers, the content of conductive fillers, and the morphology and structure of EVA matrix.

The conductivity of conductive fillers is one of the important factors affecting the formation of conductive networks. The better the conductivity of conductive fillers, the easier it is for their own conductive network to form. The conductivity of conductive fillers is influenced by factors such as the morphology of the filler, the purity and crystallinity of the conductive material.

The content of conductive fillers is another factor that affects the formation of conductive networks. As the content of conductive fillers increases, the contact points between the fillers also increase, and the connectivity of the conductive network also enhances, thereby improving the conductivity.

The morphology and structure of EVA matrix also have a certain impact on the formation of conductive networks. The crystallinity and porosity of EVA matrix can affect the dispersion and contact degree of conductive fillers, thereby affecting the formation of conductive networks.

In addition to the basic conductivity mechanism and conductive network formation mechanism, the conductivity of conductive EVA materials is also influenced by external environmental factors such as temperature, humidity, and stress. These external environmental factors can affect the electronic conduction inside conductive EVA materials, thereby altering their conductivity.

In summary, the conductive mechanism of conductive EVA materials mainly consists of two aspects: the basic conductive mechanism and the conductive network formation mechanism. The basic conductivity mechanism is related to the electronic conduction between the conductive filler and the EVA matrix, and the formation mechanism of the conductive network is the determining factor of the conductivity of the conductive EVA material, which is influenced by factors such as the conductivity of the conductive filler, the content of the conductive filler, and the morphology and structure of the EVA matrix.