Nano/micro ternary composites based on PP, nanoclay, and CaCO3

Nano-/microcomposites based on polypropylene/montmorillonite/calcium carbonate were prepared by melt mixing. Their structures and properties were characterized by small-angle X-ray diffraction, thermal analysis, and rheological measurements. The intercalation degree was found to be dependent on the compatibilizer content and the processing temperature. The addition of the organoclay slightly increased the melt crystallization temperature of polypropylene, acting as nucleating agents, and improved the degree of crystallinity. The rheological tests showed that nanocomposites increased the complex viscosity when compared with the microcomposites with the same filler content and exhibited a pronounced shear-thinning behavior in the low frequency range. A Carreau-Yasuda model was used to model the rheological behavior of these materials. The nano-/microcomposites showed a significant improvement (about 50%) of the Young's modulus when compared with microcomposites with the same filler content due to the intercalation or exfoliation of the organoclay and the enhanced degree of crystallinity. Moreover, some formulations showed an enhancement of elongation at break and ultimate strength. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

[1]  D. Gin,et al.  Highly ordered polymer–inorganic nanocomposites via monomer self assembly: In situ condensation approach , 1997 .

[2]  O. Park,et al.  Effects of organoclay modification on microstructure and properties of polypropylene-organoclay nanocomposites , 2006 .

[3]  K. Friedrich,et al.  Irradiation graft polymerization on nano-inorganic particles: An effective means to design polymer-based nanocomposites , 2000 .

[4]  Donald R Paul,et al.  Effect of organoclay structure on nylon 6 nanocomposite morphology and properties , 2002 .

[5]  K. Seefeldt,et al.  Rheology of Polypropylene/Clay Hybrid Materials , 2001 .

[6]  B. Vergnes,et al.  Effect of processing conditions on the formation of polypropylene/organoclay nanocomposites in a twin screw extruder , 2006 .

[7]  B. Vergnes,et al.  Rheological behavior of controlled‐rheology polypropylenes obtained by peroxide‐promoted degradation during extrusion: Comparison between homopolymer and copolymer , 2001 .

[8]  Marco Zanetti,et al.  Thermal behaviour of poly(propylene) layered silicate nanocomposites , 2001 .

[9]  Y. Wang,et al.  Effect of the molecular weight of maleated polypropylenes on the melt compounding of polypropylene/organoclay nanocomposites , 2005 .

[10]  Ron Dagani,et al.  PUTTING THE 'NANO' INTO COMPOSITES: From nanoparticles to nanotubes, ultrasmall building blocks lead to new and improved properties, better performance , 1999 .

[11]  R. Krishnamoorti,et al.  Rheology of polymer layered silicate nanocomposites , 2001 .

[12]  Lee Wook Jang,et al.  Preparation and Characterization of PMMA-Clay Hybrid Composite by Emulsion Polymerization , 1996 .

[13]  A. Akelah,et al.  Polymer-clay nanocomposites: Free-radical grafting of polystyrene on to organophilic montmorillonite interlayers , 1996, Journal of Materials Science.

[14]  T. Ozawa,et al.  Kinetics of non-isothermal crystallization , 1971 .

[15]  M. Modesti,et al.  Thermal behaviour of compatibilised polypropylene nanocomposite: Effect of processing conditions , 2006 .

[16]  K. Miyasaka,et al.  Effect of reducible properties of temperature, rate of strain, and filler content on the tensile yield stress of nylon 6 composites filled with ultrafine particles , 1983 .

[17]  B. Vergnes,et al.  Influence of compatibilizer and processing conditions on the dispersion of nanoclay in a polypropylene matrix , 2005 .

[18]  K. Miyasaka,et al.  Tensile yield stress of polypropylene composites filled with ultrafine particles , 1983 .