Decrease of Electric Conductivity in Plastic Composite Materials

Using the electrochemical analysis JEF-TEC provides the analysis service on degradation of the electrically conductive polymer composites in which rubber and plastics are used as a matrix.

JEF-TEC uses the cyclic voltammetry1, one of electrochemical measurement methods for assessing the deterioration of the electric conductive composite.

Evaluation Method

  • JEF-TEC uses the cyclic voltammetry(*1), one of electrochemical measurement methods for assessing the deterioration of the electric conductive composite. This method allows for monitoring in-situ the electrochemical behavior of the electric conductive polymers while the in-situ analysis can be not performed in thermal analysis on a weight change and the X-ray diffraction analysis for a structural change.
  • In electronic materials little change of the current response with multiple voltage sweep is required, that is, a change of the current response in the plots of the cyclic voltammograms should not occur. A large change in the response current indicates the sample is degraded in multiple voltage sweep, suggesting the electronic materials are not suitable for the parts configured in the environment in which oxidation-reduction reaction frequently occurs.
  • JEF-TEC provides the analysis service on degradation of electric conductive polymer composites in which rubber and plastics are used as a matrix.
(*1)Cyclic voltammetry:
One of electrochemical analysis methods to measure the response current with linearly varying the applied potential.
Figure 1 A pattern of the applied potential for the linear voltammetry Figure 1 A pattern of the applied potential
 for the linear voltammetry
Figure 2 Cyclic voltammogram Figure 2 Cyclic voltammogram

Example of Degradation Evaluation (Degradation Evaluation of Electrically Conductive Plastics Used in the Sensor of Rain Monitor)

Photo 1  Appearance of measurement equipment Photo 1 Appearance of measurement equipment
(1)
The specimen is subjected to a series of the cyclic voltammetry to plot the current response as a function of voltage giving the voltammograms in which a change of the oxidative current and the reductive current are measured.
(2)
While there is little change in the response current in the specimen at ambient temperature, the oxidative current is increased when solution temperature is increased to around 80℃.
(3)
This result indicates the oxidation occurs at the interface between the electroconductive polymer and the solution by the change of solution temperature, and it was confirmed that solution temperature affects degradation due to oxidation of electrically conductive substance.

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