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Synthesis of polypropylene/clay nanocomposites using bisupported Ziegler-Natta catalyst

Ramazani, S. A. A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/app.31102
  3. Abstract:
  4. In this article, preparation of polypropylene/clay nanocomposites (PPCNC) via in situ polymerization is investigated. MgCl2/montmorillonite bisupported Ziegler-Natta catalyst was used to prepare PPCNC samples. Montmorillonite (MMT) was used as an inert support and reinforcement agent. The nanostructure of the composites was characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy techniques. Obtained results showed that silica layers of the MMT in these PPCNC were intercalated, partially exfoliated, and uniformly dispersed in the polypropylene matrix. Thermogravimetric analysis showed good thermal stability for the prepared PPCNC. Differential scanning calorimetric was used to investigate both melting and crystallization temperatures, as well as the crystallinity of the PPCNC samples. Results of permeability analysis showed significant increase in barrier properties of PPCNC films. Effective parameters on molecular weight and flow ability of produced samples such as Al/Ti molar ratio and H2 concentration were also investigated
  5. Keywords:
  6. Clay ; Poly(propylene) ; Ziegler-Natta polymerization ; Barrier properties ; Clay nanocomposites ; Crystallinities ; Effective parameters ; Flow ability ; In-situ polymerization ; Inert support ; Melting and crystallization ; Molar ratio ; Permeability analysis ; Polypropylene matrices ; Silica layers ; Thermal stability ; Ziegler Natta polymerization ; Ziegler-Natta catalysts ; Clay minerals ; Nanocomposites ; Polypropylenes ; Propylene ; Reinforcement ; Scanning electron microscopy ; Silica ; Silicate minerals ; Thermogravimetric analysis ; Transmission electron microscopy ; Catalysts ; Crystallization ; Flow rate ; Melting point ; Nanocomposite ; Polymerization ; Polypropylene
  7. Source: Journal of Applied Polymer Science ; Volume 115, Issue 1 , 2010 , Pages 308-314 ; 00218995 (ISSN)
  8. URL: http://onlinelibrary.wiley.com/doi/10.1002/app.31102/abstract;jsessionid=F462801B46E89CD87F3B11BB94F58DB9.f03t03