Abstract
Soy hull is an agricultural by-product, and has been almost always recycled as an animal fodder for many years. Therefore, a new effective function has been studied for an industrial material. For example, the authors have investigated the soy-hull carbon (SHC) particles as a functional filler for rubbers and plastics. The SHC particle is manufactured by carbonizing the dehydrated soy hull in nitrogen gas atmosphere at high temperature. The SHC particle, consequently the porous carbon particle in which the natural porous structure retains. In this study, the characteristic of the electromagnetic shielding was investigated for the SHC/EPDM composite, which was prepared by kneading the SHC particle with the ethylene propylene diene methylene (EPDM) rubber. The degree of the electromagnetic shielding (SE) of this composite with SHC particle of 400 mass% was found to show a relatively-high value in the frequency region from 50 (SE:40dB) to 150 (SE:30dB). The degree of the absorption (RD) for electromagnetic wave was furthermore, depended on the amount of the SHC particle content, and was shown the high value (RD:-18dB) under the high frequency of 6.5 GHz.
