Elastomers and Composites

  • 제53권3호
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  • Pages.158-167
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  • 2018
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  • 2092-9676(pISSN)
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  • 2288-7725(eISSN)
한국고무학회 (The Rubber Society of Korea)
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Fabrication of CNT/MgCl2-Supported Ti-based Ziegler-Natta Catalysts for Trans-selective Polymerization of Isoprene

  • Cao, Lan (School of Polymer Science and Engineering, Qingdao University of Science and Technology) ;
  • Zhang, Xiaojie (Elastomer Lab, Department of Materials Engineering and Convergence Technology, Gyeongsang National University) ;
  • Wang, Xiaolei (School of Polymer Science and Engineering, Qingdao University of Science and Technology) ;
  • Zong, Chengzhong (School of Polymer Science and Engineering, Qingdao University of Science and Technology) ;
  • Kim, Jin Kuk (Elastomer Lab, Department of Materials Engineering and Convergence Technology, Gyeongsang National University)
  • 투고 : 2018.09.03
  • 심사 : 2018.09.28
  • 발행 : 2018.09.30
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초록

In this study, in-situ trans-selective polymerization of isoprene was carried out using titanium-based Ziegler-Natta catalysts. The catalysts were prepared by high-energy ball milling. Individually Large-inner-diameter carbon nanotubes (CNTL), and hydroxylated carbon nanotubes (CNTOH), along with magnesium chloride ($MgCl_2$) were used as the carriers for the catalysts. The optimum ball-milling time for preparing the $CNT/MgCl_2/TiCl_4$ Ziegler-Natta catalysts was 4 h. The $CNTOH/MgCl_2/TiCl_4$ catalyst showed a higher efficiency than that of the $CNTL/MgCl_2/TiCl_4$ catalyst, based on the rate of polymerization. The effects of the CNT-filler type on the isoprene polymerization behaviors and polymer properties were investigated. The morphologies of the trans-1,4-polyisoprene (TPI)/CNT and TPI/CNTOH nanocomposites exhibited a tube-like shape, and the CNTL and CNTOH fillers were well dispersed in the TPI matrix. In addition, the thermal stability of TPI significantly increased upon the introduction of a small amount of both CNTL/CNTOH fillers (0.15 wt%), owing to the satisfactory dispersion of the CNTL/CNTOH in the TPI matrix.

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