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In situ polymerization of polyethylene/clay nanocomposites using a novel clay-supported ziegler-natta catalyst

Ramazani Saadatabadi, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1002/pc.20702
  3. Publisher: 2009
  4. Abstract:
  5. Polyethylene/clay nanocomposites (PECNC) were synthesized via in situ Ziegler-Natta catalyst polymerization. Activated catalyst for polymerization of ethylene monomer has been prepared at first by supporting of the cocatalyst on the montmorillonite (MMT) smectite type clay and then active complex for polymerization formed by reaction of TiCl4 and aluminum oxide compound on the clay. Acid wash treatment has been used for increasing hydroxyl group and porosity of the clay and subsequently activity of the catalyst. The nano- structure of composites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Obtained results show that silica layers of the mineral clay in these polyethylene/nanocomposites were exfoliated, intercalated, and uniformly dispersed in the polyethylene matrix even at very high concentration of the clay. Thermogravimetric analysis (TGA) shows good thermal stability of the PECNCs. Differential scanning calorimeter (DSC) results reveal considerable decrease in the crystalline phase of the PECNC samples. Results of permeability analysis show an increase in barrier properties of PECNC films. © 2009 Society of Plastics Engineers
  6. Keywords:
  7. Active complexes ; Aluminum oxides ; Barrier properties ; Cocatalyst ; Crystalline phase ; Differential scanning calorimeters ; Ethylene monomers ; High concentration ; Hydroxyl groups ; In-situ ; In-situ polymerization ; Permeability analysis ; Polyethylene matrix ; Polyethylene/clay nanocomposite ; Silica layers ; Smectites ; TEM ; Thermal stability ; Ziegler-Natta catalysts ; Catalysis ; Catalyst activity ; Differential scanning calorimetry ; Ethylene ; Nanocomposites ; Polymerization ; Polymers ; Silica ; Silicate minerals ; Thermodynamic stability ; Thermogravimetric analysis ; Transmission electron microscopy ; X ray diffraction ; X ray diffraction analysis ; Clay minerals
  8. Source: Polymer Composites ; Volume 30, Issue 10 , 2009 , Pages 1388-1393 ; 02728397 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/pc.20702