저밀도 폴리에틸렌-클레이 나노컴포지트 시트의 기체차단 특성

A low density polyethylene (LDPE)-clay nanocomposite sheet was fabricated with the clay nanoparticles obtained from the high-temperature processing for porcelain production, and investigated for its gas barrier properties by measuring its oxygen, carbon dioxide, and water vapor permeabilities at 20, 30, and 40°C. Inductively coupled plasmaoptical emission spectrometry showed that the nanoclay was mainly composed of Ca (40.7%). Transmission electron microscopy exhibited that the nanoparticles were well dispersed in the nanocomposite sheet. Fourier transform infrared spectrometry revealed that the intermolecular bonds of LDPE were not significantly affected by the addition of nanoclay. Diaphragm diffusion analysis demonstrated that the addition of 500 mg/kg nanoclay reduced the oxygen permeability of LDPE sheet by 33-36% at 20 and 30°C but only by 4% at 40°C, while the carbon dioxide permeability was reduced by 40% at 20°C but only by about 4% at 30 and 40°C. The water vapor permeability determined by gravimetric analysis was found to be lowered by 12, 32, and 19% at 20, 30, and 40°C, respectively, by the addition of nanoclay.