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<p>The radiation-induced crosslinking reaction only occurs in the amorphous phase of polyethylene (PE), and not in the crystalline phase. In order to obtain uniformly distributed crosslinking sites, ultra-high molecular weight polyethylene (UHMWPE) samples were crosslinked by electron beam (EB) irradiation in its molten state, and compared with crosslinking at room temperature. The crosslinked UHMWPE samples were then characterized using Fourier Transform Infrared Spectroscopy (FTIR), swell ratio test, Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD). The FTIR results demonstrated that the yields of trans-vinylene of molten crosslinked samples were significantly higher than that of the room temperature crosslinked samples, and this indicated that the radiation-induced reaction were more intense in the molten state. It was worth noting that there were two melting peaks in DSC curves for the room temperature crosslinked samples, while only one for the molten crosslinked samples. Furthermore, the main melting peak of the room temperature crosslinked samples gradually increased from 135.7&#xa0;°C of the original sample to 144.8&#xa0;°C of the 300&#xa0;kGy crosslinked sample. Conversely, the melting point of molten crosslinked samples significantly decreased from 135.7&#xa0;°C of the original sample to 116.2&#xa0;°C of 300&#xa0;kGy crosslinked sample. The crystal size of the molten crosslinked samples decreased with increase dose by SEM. The XRD analysis indicated that crystal types were not affected by irradiation conditions. Finaly, the rearrangement and recrystallization behavior of the two kinds of radiation crosslinked UHMWPE were proposed, and concluded that a homogenous crosslinking network was obtained by irradiation in its molted state.</p>

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Homogeneous radiation crosslinking of ultra-high molecular weight polyethylene in molten state

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Jing Wang,
  • Lei Han,
  • Manli Lu,
  • Weihua Liu,
  • Wenli Zhang,
  • Mouhua Wang

摘要

The radiation-induced crosslinking reaction only occurs in the amorphous phase of polyethylene (PE), and not in the crystalline phase. In order to obtain uniformly distributed crosslinking sites, ultra-high molecular weight polyethylene (UHMWPE) samples were crosslinked by electron beam (EB) irradiation in its molten state, and compared with crosslinking at room temperature. The crosslinked UHMWPE samples were then characterized using Fourier Transform Infrared Spectroscopy (FTIR), swell ratio test, Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD). The FTIR results demonstrated that the yields of trans-vinylene of molten crosslinked samples were significantly higher than that of the room temperature crosslinked samples, and this indicated that the radiation-induced reaction were more intense in the molten state. It was worth noting that there were two melting peaks in DSC curves for the room temperature crosslinked samples, while only one for the molten crosslinked samples. Furthermore, the main melting peak of the room temperature crosslinked samples gradually increased from 135.7 °C of the original sample to 144.8 °C of the 300 kGy crosslinked sample. Conversely, the melting point of molten crosslinked samples significantly decreased from 135.7 °C of the original sample to 116.2 °C of 300 kGy crosslinked sample. The crystal size of the molten crosslinked samples decreased with increase dose by SEM. The XRD analysis indicated that crystal types were not affected by irradiation conditions. Finaly, the rearrangement and recrystallization behavior of the two kinds of radiation crosslinked UHMWPE were proposed, and concluded that a homogenous crosslinking network was obtained by irradiation in its molted state.