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Investigation of in situ prepared polypropylene/clay nanocomposites properties and comparing to melt blending method

Baniasadi, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2009.07.014
  3. Abstract:
  4. The morphological, physical and mechanical properties of polypropylene/clay nanocomposites (PPCNs) were prepared by in situ polymerization are investigated. Non-modified scmectite type clay (e.g. bentonite) was used to prepare bi-supported Ziegler-Natta catalyst of TiCl4/Mg(OEt)2/clay. Exfoliated PPCNs were obtained by in situ intercalative polymerization of propylene using produced bi-supported catalyst. X-ray diffraction (XRD) patterns and transmission electron microscopy (TEM) micrograph were used to assess the clay morphology and dispersion of clay. The crystalline structures of PPCNs were characterized by differential scanning calorimetry (DSC). The mechanical properties of PPCNs were studied by tensile and impact tests. thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis DMTA were used to characterize the thermal and dynamic mechanical properties, respectively. The thermo-mechanical properties of prepared nanocomposites were considerably improved by introducing small amount of clay, which indicated that the clay most be significantly intercalated or exfoliated in the prepared nanocomposite preparation process. In addition, morphology and some of the mechanical and thermal properties of in situ PPCNs were compared with those of PPCNs prepared by melt blending method in this study and some presented reported results in literatures
  5. Keywords:
  6. Nanocomposite ; Polypropylene ; Crystalline structure ; Dynamic mechanical property ; Dynamic mechanical thermal analysis ; Impact test ; In situ polymerization ; In-situ ; Mechanical and thermal properties ; Melt-blending methods ; Physical and mechanical properties ; Preparation process ; Supported catalysts ; TEM ; Thermomechanical properties ; Ziegler-Natta catalysts ; Bentonite ; Blending ; Catalysts ; Clay ; Clay minerals ; Differential scanning calorimetry ; Dynamic mechanical analysis ; Morphology ; Nanocomposites ; Polymerization ; Polymers ; Propylene ; Thermogravimetric analysis ; Thermomechanical treatment ; Thermoplastics ; Transmission electron microscopy ; X ray diffraction ; Mechanical properties
  7. Source: Materials and Design ; Volume 31, Issue 1 , 2010 , Pages 76-84 ; 02641275 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0261306909003562