How to evaluate the electrothermal performance of conductive EVA materials?

Conductive EVA material is a type of ethylene vinyl acetate copolymer material with conductive properties, widely used in electronic, electrical and other fields. Evaluating the electrothermal performance of conductive EVA materials is to determine their potential application in electrothermal devices, as well as to guide product design and process optimization. The following will introduce how to evaluate the electrothermal performance of conductive EVA materials.

1. Resistance measurement:

Resistance is an important indicator for evaluating the electrothermal performance of conductive EVA materials. By measuring the resistance of conductive EVA materials, one can understand their conductivity. The four probe testing method can accurately measure the resistance of conductive EVA materials. In the testing, it is necessary to fix the conductive EVA material sample in the testing fixture and measure it using a fixed distance between four probes. When measuring, add a certain amount of current and record the voltage value. By calculating, the resistance value of conductive EVA material can be obtained.

2. Conductivity measurement:

Conductivity is the reciprocal of resistance and another important indicator of the conductivity of conductive EVA materials. The conductivity can be calculated by measuring the resistance. Based on the resistance value and geometric size of conductive EVA materials, their conductivity can be calculated. The measurement of conductivity can further determine whether the required electrothermal performance of conductive EVA materials can meet specific application requirements.

3. Thermal conductivity measurement:

Thermal conductivity is a performance indicator of conductive EVA materials in terms of thermal conductivity. Usually, thermal conductivity instruments are used for measurement. In measurement, conductive EVA material samples need to be accurately cut into specified shapes and sizes, while ensuring surface smoothness. The thermal conductivity of the sample under temperature gradient will be obtained through a thermal conductivity measuring instrument, and the thermal conductivity coefficient will be calculated.

4. Power coefficient measurement:

The power coefficient is the performance index of conductive EVA materials in conductive heating. By measuring current and voltage, the power value of conductive EVA material can be calculated. Based on the temperature changes after heating, the thermal power coefficient of conductive EVA materials can also be further calculated. The measurement of power coefficient can intuitively understand the heating performance of conductive EVA materials in electric heating devices.

5. Antioxidant performance test:

Conductive EVA materials may be affected by oxides during use, leading to a decrease in performance. Therefore, it is necessary to test the oxidation resistance of conductive EVA materials. The stability and antioxidant performance of conductive EVA materials in high-temperature environments can be evaluated using common oxidation experimental methods, such as thermogravimetric analysis, infrared spectroscopy, etc.

6. Conductivity stability test:

Conductive EVA materials need to work in a stable conductive state. Therefore, it is necessary to test the stability of conductive EVA materials under long-term conductive working conditions. During the testing process, the resistance changes of conductive EVA materials are observed by continuously loading current to evaluate their conductive stability performance.

7. Heat resistance test of conductive EVA material:

The changes in the conductivity of conductive EVA materials under high temperature environments also need to be investigated. The thermal weight loss method can be used for testing to measure the quality changes of conductive EVA materials under certain temperature conditions. By testing, the heat resistance of conductive EVA materials in high-temperature environments can be obtained, further evaluating their electrothermal performance.

In summary, the evaluation of the electrothermal performance of conductive EVA materials mainly includes resistance measurement, conductivity measurement, thermal conductivity measurement, power coefficient measurement, oxidation resistance test, conductivity stability test, and heat resistance test. Through these tests, a comprehensive understanding of the electric heating performance of conductive EVA materials can be obtained, providing strong references for applications in electronic, electrical and other fields.