화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.24, No.6, 621-627, December, 2013
Export Citation
폴리프로필렌 카보네이트/박리흑연 나노복합필름의 수분흡수 거동
Water Sorption Behaviors of Poly(Propylene Carbonate)/Exfoliated Graphite Nanocomposite Films
김도완, 김인수, 서종철†, 한학수1
  • 연세대학교 과학기술대학 패키징학과
  • 1연세대학교 공과대학 화공생명공학과
Dowan Kim, Insoo Kim, Jongchul Seo†, and Haksoo Han1
  • Department of Packaging, Yonsei University, 1 Yonseidaegil, Wonju-si, Kangwondo 220-710, Korea
  • 1Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 120-749, Korea
E-mail:
초록
친환경 소재인 폴리프로필렌카보네이트(PPC)를 포장소재로서 응용하기 위하여 가로세로비가 큰 박리흑연 EFG(exfoliated graphite)를 이용하여 함량을 달리한 6종류의 PPC/EFG 나노복합필름을 제조하였다. 제조한 나노복합필름의 수분흡수 거동을 gravimetric method를 이용하여 측정하였으며, 나노복합필름의 수분에 대한 화학적 친화성(chemical affinity)과 모폴로지(morphology) 변화를 이용하여 해석하였다. 필름 내로의 수분확산 거동은 박막의 불균일성에도 불구하고 Fickian diffusion model에 잘 부합하였으며, EFG의 함량이 증가할수록 수분 확산계수와 수분 흡수량은 12.5 × 10^(-10)cm2sec^(-1)에서 7.2 × 10^(-10)cm2sec^(-1), 8.9 wt%에서 4.2 wt%로 각각 감소하였다. 이는 수분에 대한 PPC의 차단특성이 EFG의 도입에 따라 향상되는 것을 의미한다. 높은 가로세로비를 가진 EFG를 PPC에 도입함으로써 PPC/EFG 나노복합 필름의 수분에 대한 우수한 차단성 특성 발현은 패키징분야를 포함한 차단성이 요구되는 분야로의 친환경 PPC 응용성이 클 것으로 기대된다. 한편, EFG의 도입효과를 극대화하기 위한 추가적인 EFG의 분산성 향상연구가 필요하다.
In order to apply eco-friendly poly(propylene carbonate) (PPC) into barrier packaging materials, six different PPC/exfoliated graphite (EFG) nanocomposite films with different EFG were successfully prepared by a solution blending method. Their water sorption behavior was gravimetrically investigated as a function of the EFG content and interpreted with respect to their chemical structure and morphology. The water sorption isotherms were reasonably well fitted by Fickian diffusion model, regardless of morphological heterogeneities. With increasing the EFG content, the diffusion coefficient and water uptake decreased from 12.5 × 10^(-10)cm2sec^(-1) to 7.2 × 10^(-10)cm2sec^(-1) and from 8.9 wt% to 4.2 wt%, respectively, which indicates that the moisture resistance capacity of PPC was greatly enhanced by incorporating EFG into PPC. The enhanced water barrier property of the PPC/EFG nanocomposite films with the high aspect ratio EFG makes them potential candidates for versatile packaging applications. However, to maximize the performance of the nanocomposite films, further researches are required to increase the compatibility of EFG in the PPC matrix.
Keywords:poly(propylene carbonate);exfoliated graphite;nanocomposite;water sorption;chemical structure;morphology
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