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Received January 10, 2014
Accepted April 12, 2014
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폴리아크릴산 나트륨 염이 함침된 흡수성 고분자 복합 필름의 제조 및 특성 연구
Preparation and Properties of Moisture-absorbing Film Impregnated with Polyacrylic Acid Partial Sodium Salt Material
연세대학교 패키징학과, 220-710 강원 원주시 연세대길 1 1CJ 제일제당, 100-400 서울 중구 동호로 330
Department of Packaging, Yonsei University, 1 Yonseidae-gil, Wonju, Gangwon 220-710, Korea 1Packaging R&D Center, CJ Cheiljedang, 330 dongho-ro, Jung-gu, Seoul 100-400, Korea
Korean Chemical Engineering Research, August 2014, 52(4), 530-537(8), 10.9713/kcer.2014.52.4.530 Epub 30 July 2014
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Abstract
수분은 제품의 물리적 변화, 미생물 성장, 화학적 반응을 일으켜 품질을 저하시키는 주요 요인이 된다. 본 연구는 기능성 포장 필름으로 응용하기 위하여 수분을 흡착력이 우수한 폴리아크릴산 나트륨 염(polyacrylic acid partial sodium salt, PAPSS)을 선상저밀도폴리에틸렌(LLDPE) 고분자 수지에 함침된 수분 흡착 기능을 가진 복합 필름을 제조하였다. 제조한 수분 흡착 복합 필름은 PAPSS 물질 입자가 LLDPE 고분자 매트릭스에 잘 분포되어 있음을 확인하였다. 또한 PAPSS 첨가량이 증가됨에 따라 필름의 투명도가 저하되었다. 고분자에 첨가되는 PAPSS 물질의 증가는 복합 필름의 인장강도와 신장률 값이 감소됨을 확인할 수 있었으나 각각 0.5, 1, 그리고 2% PAPSS 필름들 간에는 큰 유의적 차이를 보이지 않았다. 반면 4% PAPSS 함침 필름은 다른 농도로 PAPSS 물질이 함침된 필름과 비교하여 인장강도 및 신장률 값의 급격한 감소를 나타냈다. PAPSS 함량의 증가는 필름의 산소 및 수분 투과도 값이 감소됨이 관찰되어 고분자에 PAPSS 첨가는 필름의 가스 차단의 개선을 나타냈다. PAPSS 함침 필름들은 상대적으로 높은 습도 환경 조건에서 우수한 수분 흡착율을 나타내는 것을 확인하였으며, 특히 4% PAPSS 함침 필름이 다른 PAPSS 농도 함침 필름들에 비하여 높은 수분 흡착율을 보였다. 25 ℃ 조건에서 필름 샘플의 수분 흡착 등온 곡선에 가장 적합하게 묘사되는 최적의 모델 방정식은 GAB 모델로 나타냈다. PAPSS 첨가는 고분자 필름의 결정화 및 녹는 온도 변화에 영향을 보였으나, 열중량 변화에는 큰 차이가 없이 안정된 열적 특성을 나타냈다.
Moisture is a major factor causing the deteriorative physical change, microbial growth, and chemical reaction of the products. In this study, the moisture absorbing composite films have been prepared with moisture absorbing material of polyacrylic acid partial sodium salt (PAPSS) impregnated on LLDPE polymer for the functional packaging applications. The results showed that PAPSS impregnated film illustrated uniformly dispersed PAPSS particles in the LLDPE polymer matrix. The transparency of the PAPSS impregnated film decreased slightly at higher PAPSS concentrations. An increase in the PAPSS content for moisture-absorbing films showed a similar decrease in tensile strength, percent elongation at break, and tear strength. Their values of films impregnated with PAPSS of 0.5, 1, and 2% showed no significant difference. Meanwhile,_x000D_
4% PAPSS films significantly decreased the values of mechanical properties compared to the films impregnated with different PAPSS levels. Values of the oxygen permeability and water vapor permeability for PAPSS impregnated films decreased significantly with greater PAPSS. The results indicate that 4% PAPSS impregnated in LLDPE films had high affinity of moisture absorbencies compared to the other films. The mathematical equation that best described the moisture sorption isotherm of each film sample was the GAB equation at 25 ℃. The crystallization and melting temperatures of PAPSS films were influenced by the addition of PAPSS material, but showed good thermal stability.
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Chowdhury T, Das M, Int. Food Res. J., 19, 1669 (2012)
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