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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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Dual-Functioning Antibacterial Eugenol-Derived Plasticizers for Polylactide.

Wenxiang Xuan1, Karin Odelius1, Minna Hakkarainen1

  • 1Department of Fibre and Polymer Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Teknikringen 56, 100 44 Stockholm, Sweden.

Biomolecules
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Summary
This summary is machine-generated.

New biobased plasticizers derived from eugenol offer dual plasticizing and antibacterial functions for polylactide (PLA). These additives significantly improve PLA

Keywords:
antibacterialeugenollevulinic acidplasticizerpolylactide

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Area of Science:

  • Polymer Science and Engineering
  • Green Chemistry
  • Materials Science

Background:

  • Polylactide (PLA) is a biodegradable polymer with limitations in flexibility and toughness.
  • Developing sustainable additives with multiple functionalities is crucial for enhancing polymer performance.
  • Eugenol, a natural aromatic compound, and biobased acids offer potential for creating novel functional materials.

Purpose of the Study:

  • To design and synthesize novel dual-functioning plasticizers with plasticizing and antibacterial properties.
  • To evaluate the performance of these plasticizers in improving the properties of polylactide (PLA).
  • To investigate the structure-property relationships influencing plasticization and antibacterial activity.

Main Methods:

  • One-pot synthesis of three ester-rich plasticizers using eugenol and levulinic/valeric acid.
  • Comprehensive characterization using nuclear magnetic resonance (NMR) techniques and electrospray ionization-mass spectrometry (ESI-MS).
  • Evaluation of plasticizing effects on PLA's glass transition temperature (Tg) and mechanical properties, alongside antibacterial activity testing.

Main Results:

  • Eugenyl valerate significantly reduced PLA's Tg by 43 °C and increased strain at break to 560%.
  • Eugenyl levulinates also enhanced PLA's strain at break and exhibited higher thermal stability.
  • One eugenyl levulinate derivative demonstrated significant inhibition against Staphylococcus aureus and Escherichia coli.

Conclusions:

  • Eugenol-based plasticizers offer a promising route to develop sustainable additives with dual plasticizing and antibacterial functionalities for PLA.
  • Tailoring the functional groups in the plasticizers allows for control over their performance in modifying PLA properties and antimicrobial efficacy.
  • This approach highlights the potential of biobased platform chemicals in creating advanced materials with enhanced performance and added value.