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Structural analysis of nanocomposites based on HDPE/EPDM blends.

Roberto Zitzumbo1, Sergio Alonso, Felipe Avalos

  • 1CIATEC, A.C. Omega 201, Fracc. Delta 37545, Léon, Gto, México.

Journal of Nanoscience and Nanotechnology
|April 1, 2006
PubMed
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This study developed nanocomposites using HDPE and EPDM blends with organoclay and EPDM-g-MA. The resulting materials show increased viscosity, indicating a nanostructure beneficial for material properties.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • High-density polyethylene (HDPE) and ethylene propylene diene monomer (EPDM) blends are widely used polymers.
  • Organoclay and maleic anhydride grafted EPDM (EPDM-g-MA) are effective in modifying polymer properties.
  • Compatibilizers are crucial for creating stable and effective polymer nanocomposites.

Purpose of the Study:

  • To synthesize and characterize intercalated and exfoliated nanocomposites using HDPE and EPDM blends.
  • To investigate the role of EPDM-g-MA as a compatibilizer in organoclay-filled polymer blends.
  • To understand the influence of organoclay and compatibilizer on the rheological behavior and morphology of the nanocomposites.

Main Methods:

  • Preparation of nanocomposites via melt processing with organoclay and EPDM-g-MA.
  • Rheological studies to analyze viscosity and structural network formation.
  • X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) for morphological analysis.
  • Analysis of polymer chain diffusion during the intercalation process.

Main Results:

  • Significant increase in viscosity observed, suggesting percolation network formation due to intercalated and exfoliated clay.
  • Nanostructured micro-domains dispersed within a continuous HDPE phase were proposed based on rheological data.
  • XRD and SEM confirmed the presence of nanostructure and provided insights into the intercalation mechanism.
  • Evidence of simultaneous diffusion of HDPE chains and EPDM-g-MA into silicate galleries during melt processing.

Conclusions:

  • EPDM-g-MA effectively acts as a compatibilizer in HDPE/EPDM/organoclay nanocomposites.
  • The addition of organoclay and EPDM-g-MA leads to significant changes in rheological properties and induces nanostructure formation.
  • The study elucidates the complex intercalation mechanism involving simultaneous diffusion processes.
  • The developed nanocomposites exhibit potential for advanced material applications requiring enhanced properties.