Studies of the variation in the dielectric constant and unique behaviors with changes in the foaming ratio of the microcellular foaming process

MCPs have many advantages, such as favorable mechanical, optical, acoustical, and electrical properties due to the size of the cells. Porous plastics also share the advantages of plastics processed by existing conventional foaming technologies. This study focuses on the electrical properties by examining the variation of the dielectric constant. Samples with different foaming ratios were created. Tests in this research proved that the dielectric constant was inversely proportional to the foaming ratio. In some cases, however, an inverse proportion was not observed. Therefore, this study investigated the characteristics and cell morphology of the MCPs to reveal the factors influencing.