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Preparation of ultra high molecular weight polyethylene with MgCl2/TiCl4 catalysts: Effect of temperature and pressure

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Abstract

The polymerization of ethylene (E) was carried out using a MgCl2-supported TiCl4 catalyst in conjunction with triethylaluminium as a cocatalyst. The effects of the polymerization temperature (T p ) and E pressure (P E ) on E polymerization were studied. The maximum catalyst activity was obtained at 40°C. The melting temperature (T m ) and crystallinity (X c ) were less affected by the T p . The molecular weight decreased with increasing T p but the polydispersity index (PDI) increased. In addition, the effect of two stepwise T p on E polymerization was investigated and the bimodal gel permeation chromatography (GPC) curve was obtained. The catalyst activity increased drastically with increasing P E . The higher P E in the range of 1–12 kgf/cm2 showed a higher M v of the ultra high molecular weight polyethylene (UHMWPE) obtained, whereas increasing P E decreased the PDI. Because it was very difficult to obtain the molecular weight distribution of UHMWPE through GPC analysis, the molecular weight distribution was analyzed from rheometry measurements of the UHMWPE melt.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Kyungpook National University, Daegu, 702-701, Korea

    He-xin Zhang, Keun-Byoung Yoon & Dong-ho Lee

  2. R&D Center, Korea Petrochemical Ind., Co., Ulsan, 680-110, Korea

    Young-jun Shin

Authors
  1. Young-jun Shin
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  2. He-xin Zhang
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  3. Keun-Byoung Yoon
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  4. Dong-ho Lee
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Correspondence to Keun-Byoung Yoon or Dong-ho Lee.

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Shin, Yj., Zhang, Hx., Yoon, KB. et al. Preparation of ultra high molecular weight polyethylene with MgCl2/TiCl4 catalysts: Effect of temperature and pressure. Macromol. Res. 18, 951–955 (2010). https://doi.org/10.1007/s13233-010-1003-1

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  • DOI: https://doi.org/10.1007/s13233-010-1003-1

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