Maleic anhydride-grafted linear low-density polyethylene with low gel content

Authors

  • Le-Ping Huang,

    1. Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
    Search for more papers by this author
  • Xing-Ping Zhou,

    1. Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
    Search for more papers by this author
  • Wei Cui,

    1. Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
    Search for more papers by this author
  • Xiao-Lin Xie,

    Corresponding author
    1. Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
    • Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
    Search for more papers by this author
  • Shen-Yi Tong

    1. Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, Wuhan 430073, China
    Search for more papers by this author

Abstract

Maleic-anhydride-grafted linear low-density polyethylene (LLDPE-g-MAH) with low gel content was synthesized by the solid-phase grafting polymerization of low molecular weight linear low-density polyethylene (LLDPE) with melt flow index of 49.4 g/10 min, its structure and properties were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, wide-angle X-ray diffraction, polarized optical microscopy, and capillary rheometer. At the experimental conditions, maleic anhydride is successfully grafted onto LLDPE with the grafting degree of 1.1–2.4% and the gel content less than 3.7% since the chain-branching reaction is dominant side reaction. The melting temperature of LLDPE-g-MAH is higher than that of pristine LLDPE due to the increased molecular polarity, but its degree of crystallinity and crystallization rate decrease due to its chain-branching structure. The apparent viscosity of LLDPE-g-MAH is higher than that of pristine LLDPE, and its shear-sensitivity is weakened due to the chain branching and subsequent difficulty in disentanglement under shear force. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers

Ancillary