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Antimicrobial Carvacrol-Containing Polypropylene Films: Composition, Structure and Function.

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Antimicrobial polypropylene films were created using carvacrol, a natural essential oil. Incorporating carvacrol into halloysite nanotubes enhanced film properties, offering superior antimicrobial activity and controlled release.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biotechnology

Background:

  • Essential oils (EOs) are explored for imparting antimicrobial properties to polymers.
  • The volatility of EOs poses challenges for high-temperature polymer processing.
  • Carvacrol, a natural EO, is investigated for its antimicrobial potential.

Purpose of the Study:

  • To develop antimicrobial polypropylene (PP) films by incorporating carvacrol.
  • To investigate the impact of carvacrol and halloysite nanotubes (HNTs) on PP film properties.
  • To understand the molecular interactions within carvacrol-containing PP systems.

Main Methods:

  • Melt compounding of PP with carvacrol or HNTs-loaded carvacrol.
  • Characterization of film composition, PP crystalline structure, morphology, and mechanical properties.
  • Molecular dynamics simulations to analyze component interactions.
  • Antimicrobial testing against *Escherichia coli* and *Alternaria alternata*.

Main Results:

  • Strong PP-carvacrol interactions reduced EO loss during processing, enabling production.
  • Carvacrol-containing films demonstrated significant antimicrobial activity.
  • PP/(HNTs-carvacrol) nanocomposites showed enhanced crystallinity, mechanical strength, and prolonged carvacrol release compared to PP/carvacrol blends.

Conclusions:

  • High-temperature processing of volatile EOs in polymers is feasible with controlled interactions.
  • Halloysite nanotubes improve PP matrix properties and carvacrol retention, leading to enhanced antimicrobial performance.
  • This research offers a pathway for creating advanced antimicrobial polymer materials.