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Effect of the reaction atmosphere on high-density polyethylene functionalized by ultraviolet irradiation

Authors

  • Shishan Wu,

    Corresponding author
    1. Center of Research on Surface and Interface Chemical Engineering and Technology, Nanjing University, Nanjing 210093, People's Republic of China
    2. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, People's Republic of China
    • Center of Research on Surface and Interface Chemical Engineering and Technology, Nanjing University, Nanjing 210093, People's Republic of China
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  • Xi Xu

    1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, People's Republic of China
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Abstract

The structure and hydrophilicity of high-density polyethylene (HDPE) functionalized by ultraviolet irradiation in air and O2 were studied with Fourier transform infrared, X-ray photoelectron spectroscopy, differential scanning calorimetry, and contact-angle measurements with water and liquid paraffin. The results showed that C[BOND]O, C([DOUBLE BOND]O)O, and C[DOUBLE BOND]O functional groups were introduced onto molecular chains of HDPE during irradiation in air and O2, and their contents increased with the irradiation time. The number of oxygen-containing groups of HDPE irradiated in O2 was much higher than that in air. A higher functionalization efficiency for HDPE was achieved by irradiation in O2. After the irradiation, the contact angle of HDPE with water became smaller, the contact angle of HDPE with liquid paraffin became larger, and the surface tension increased; this showed that the hydrophilicity of irradiated HDPE was improved. HDPE irradiated in O2 exhibited better hydrophilicity than HDPE irradiated in air. Furthermore, with an increase in the irradiation time, the melting temperature of HDPE decreased, and the heat of fusion and the degree of crystallinity increased. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 00: 2326–2329, 2004

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