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Polyolefin/ZnO Composites Prepared by Melt Processing.

Alojz Anžlovar1, Mateja Primožič2, Iztok Švab3

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Molecules (Basel, Switzerland)
|July 5, 2019
PubMed
Summary

Polyolefin composites with zinc oxide (ZnO) nanoparticles show significant antibacterial activity against Staphylococcus aureus. Mechanical properties were largely unaffected, but UV exposure caused color changes, particularly in HDPE composites with Zano 20.

Keywords:
UV-Vis stabilityZnO nanoparticlesantibacterial activitycompositeshigh density polyethylenemechanical and thermal propertiespolypropylene

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Polyolefins like High-Density Polyethylene (HDPE) and Polypropylene (PP) are widely used polymers.
  • Incorporating nanoparticles such as zinc oxide (ZnO) can enhance polymer properties.
  • Understanding the impact of ZnO nanoparticles on polyolefin performance is crucial for material development.

Purpose of the Study:

  • To investigate the effects of two commercial nano ZnO powders on the mechanical, thermal, UV-Vis stability, and antibacterial properties of HDPE and PP composites.
  • To evaluate the influence of ZnO type and concentration on composite performance.
  • To correlate material properties with bacterial efficacy.

Main Methods:

  • Melt processing was used to prepare HDPE and PP composites with Zinkoxyd aktiv and Zano 20 nano ZnO powders.
  • Mechanical properties were assessed using tensile testing.
  • UV-Vis stability was evaluated after artificial sunlight exposure.
  • Antibacterial activity was tested against Staphylococcus aureus and Escherichia coli.

Main Results:

  • Nano ZnO had minimal impact on the mechanical properties and crystallinity of HDPE and PP composites.
  • UV exposure led to more pronounced color changes in polyolefin/ZnO composites than in pure matrices, especially for HDPE and composites with Zano 20.
  • High antibacterial activity against S. aureus was observed for all polyolefin/ZnO composites.
  • Antibacterial activity against E. coli was only observed with unmodified ZnO.

Conclusions:

  • Polyolefin/ZnO composites exhibit excellent antibacterial properties against Gram-positive bacteria (S. aureus).
  • The choice of ZnO type and concentration influences UV-induced color stability.
  • Further research may explore surface modification for enhanced E. coli efficacy.