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Water Sorption Behaviors of Poly(Propylene Carbonate)/Exfoliated Graphite Nanocomposite Films

폴리프로필렌 카보네이트/박리흑연 나노복합필름의 수분흡수 거동

  • Kim, Dowan (Department of Packaging, Yonsei University) ;
  • Kim, Insoo (Department of Packaging, Yonsei University) ;
  • Seo, Jongchul (Department of Packaging, Yonsei University) ;
  • Han, Haksoo (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 김도완 (연세대학교 과학기술대학 패키징학과) ;
  • 김인수 (연세대학교 과학기술대학 패키징학과) ;
  • 서종철 (연세대학교 과학기술대학 패키징학과) ;
  • 한학수 (연세대학교 공과대학 화공생명공학과)
  • Received : 2013.07.15
  • Accepted : 2013.08.14
  • Published : 2013.12.10

Abstract

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 $12.5{\times}10^{-10}cm^2sec^{-1}$ to $7.2{\times}10^{-10}cm^2sec^{-1}$ 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.

Acknowledgement

Supported by : 한국연구재단

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