Modulus and Surface Roughness of EVA/Acetylene Black Composites for Power Cable

To measure elastic properties and surface roughness of semi-conducting materials in power cable, we have investigated modulus and micro-structure of EVA/ acetylene black composites that are showed by changing the content of acetylene black. The specimen was primarily kneaded in material samples of pellet form for 5 minutes on rollers of between 70[°C] and 100[°C]. Then this was produced as sheets after pressing for 20 minutes at 180[°C] in a pressure of 200[kg/cm]. The content of conductive acetylene black was 20, 30 and 40[wt%], respectively. The modulus experiment was measured by DMA 2980. The ranges of measurement temperature were from -50[°C] to 100[°C] and the applied frequency was 1[Hz]. Finally, the surface roughness of specimen was measured by AFM. The modulus of specimen was increased according to an increment of acetylene black, while tanδ was decreased. And modulus was rapidly decreased at the glass transition temperature. And surface roughness of specimens in the AFM was decreased by an increment of acetylene black.