Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on the Hydrogen Degradation of HDPE by Hydrogen Pressure of 90 MPa

90 MPa의 수소 압력에 의한 HDPE의 수소 열화 연구

  • MINA KIM (Department of Chemical Engineering, Chosun University Graduate School) ;
  • CHANG HOON LEE (Department of Biochemical Engineering, Chosun University)
  • 김민아 (조선대학교 대학원 화학공학과) ;
  • 이창훈 (조선대학교 생명화학공학과)
  • Received : 2023.04.20
  • Accepted : 2023.06.15
  • Published : 2023.06.30
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Abstract

The physical and chemical changes exhibited by high density polyethylene (HDPE) after treatment with hydrogen at a pressure of 90 MPa followed by rapid release of the hydrogen were studied. X-ray diffraction, differential scanning calorimetry, thermo gravimetric analysis, and attenuated total reflectance (ATR)-fourier transform infrared (FTIR) were used for this purpose. As a result, it was found that the degree of crystallinity of HDPE decreased after hydrogen pressure treatment, while the average thickness of lamellae that constitute the crystals and the melting temperature of the crystalline region actually increased. The decomposition temperature also increased by about 3℃. In addition, it was found that the hydrogen bonding network between -OH groups in the HDPE sample was strengthened and partial chain scission occurred. These cut chains were found to be terminated by oxidative degradation such as cross-linking between chains, -C=O, -C-O, and -CHO, or by the formation of -CH3 at the chain ends, as confirmed by ATR-FTIR.

Keywords

Acknowledgement

This study was supported by research fund from Chosun University, 2022.

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