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Related Experiment Videos

Coupling of HDPE/hydroxyapatite composites by silane-based methodologies.

R A Sousa1, R L Reis, A M Cunha

  • 1Department of Polymer Engineering, University of Minho, 4800-058 Guimarães, Portugal. rasousa@dep.uminho.pt

Journal of Materials Science. Materials in Medicine
|September 7, 2004
PubMed
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Silane coupling treatments significantly enhance high-density polyethylene (HDPE)/hydroxyapatite (HA) composites, especially with non-sintered HA powders. This improves both stiffness and strength, leading to better material performance.

Area of Science:

  • Materials Science
  • Polymer Composites
  • Surface Chemistry

Background:

  • High-density polyethylene (HDPE) composites incorporating hydroxyapatite (HA) are explored for advanced applications.
  • Effective interfacial adhesion between HDPE and HA is crucial for optimizing composite mechanical properties.
  • Silane coupling agents are investigated as a method to improve the compatibility between polymer matrices and ceramic fillers.

Purpose of the Study:

  • To investigate the efficacy of various silane coupling treatments on HDPE/HA composites.
  • To compare the performance of composites filled with sintered (HAs) versus non-sintered (HAns) hydroxyapatite.
  • To correlate mechanical property enhancements with observed interfacial adhesion using scanning electron microscopy (SEM).

Main Methods:

Related Experiment Videos

  • Five silanes (MEMO, DAMO, VTMO, AMEO, PTMO) were used to treat HA powders via dipping or spraying.
  • Treated HA powders were compounded with HDPE, with or without additives like acrylic acid or organic peroxide.
  • Composites were compression molded, followed by tensile testing and SEM analysis of fracture surfaces.

    • Main Results:

    • For HAs composites, MEMO and AMEO treatments improved stiffness, but strength showed minimal change.
    • For HAns composites, treatments with amino silanes significantly enhanced both stiffness and strength.
    • Improved mechanical properties in HAns composites correlated with enhanced interfacial adhesion observed via SEM.

    Conclusions:

    • Silane coupling treatments are effective in enhancing the mechanical properties of HDPE/HA composites.
    • Non-sintered HA powders (HAns) exhibit greater improvement due to higher surface area and reactivity.
    • Amino silanes are particularly effective for improving the strength of HAns-filled composites.