화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.28, No.8, 709-713, July, 2020
DOI10.1007/s13233-020-8089-x  Export Citation
Improvement in Barrier Properties Using a Large Lateral Size of Exfoliated Graphene Oxide
Jinhwa You, Beomjin Oh, Young Soo Yun1, †, and Hyoung-Joon Jin†
  • Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea
  • 1KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
E-mail:,
The gas barrier properties of polymers can be improved by reducing gas diffusivity and solubility by using graphene oxide (GO) of various lateral sizes (~3, ~25, ~45 μm). By using GO, the gas diffusion path of the polymer was effectively increased. To reduce the solubility, alkylated GO (AGO) was synthesized by an SN2 reaction between octyl amine and GO. The hydrophobicity of AGO was confirmed through contact angle measurements, and octylamine on the AGO surface was identified by Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy analysis. When GO and AGO with comparatively large lateral size (~45 μm) were homogeneously dispersed in polyvinyl alcohol (PVA) and polyvinylidene chloride (PVDC), respectively, the oxygen transmission rates (OTR) of resulting PVA/GO and PVDC/AGO composite films were significantly reduced. The OTR of PVA/GO composite film reduced from 1.9 × 100 to 5.0 × 10-2 cm3/m2·day as compared to neat PVA; whereas, the OTR of PVDC/AGO composite film reduced from 1.2 × 100 to 6.8 × 10-1 cm3/m2·day. In addition, the water vapor transmission rate (WVTR) of the PVDC/AGO composite film remarkably decreased from 1.4 g/m2·day (neat PVDC) to ∼5.5·10-1 g/m2·day, where the lateral size of AGO was insignificant. The WVTR results of PVDC/AGO composite films are in contrast to those for PVA/GO composite films, which did not demonstrate any improvement in WVTR with the addition of GO. Based on the experimental results, it was determined that oxygen permeability and water vapor permeability are more affected by diffusivity and solubility, respectively.
Keywords:Jonscher power law;dielectric relaxation;frequency dependent conductivity;polymer electrolyte membranes
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