저밀도 폴리에틸렌-클레이 나노컴포지트 시트의 기체차단 특성

유희재¹, 김영석¹, 정동화²^,^*

Gas Barrier Characteristics of Low Density Polyethylene-Clay Nanocomposite Sheets

HeeJae Yoo¹, Young-Suk Kim¹, Donghwa Chung²^,^*

¹이화여자대학교 식품공학과

²강릉원주대학교 해양식품공학과

¹Department of Food Science and Technology, Ewha Womans University

²Department of Marine Food Science and Technology, Gangneung-Wonju National University

^*Corresponding author: Donghwa Chung, Department of Marine Food Science and Technology, Gangneung-Wonju National University, Gangneung, Gangwon, 210-702, Korea. Tel: +82-33-640-2347; Fax: +82-33-640-2850, E-mail: dchung68@gwnu.ac.kr

ⓒ Copyright 2012 Korean Society for Food Engineering. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Jan 26, 2012; Revised: Feb 27, 2012; Accepted: Mar 05, 2012

Published Online: May 31, 2012

Abatract

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.

Keywords: low density polyethylene; clay; nanocomposite; permeability; diaphragm diffusion analysis