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Blending Poly(dimethylsiloxane) with Poly(lactic acid) Using Polyhydroxyurethane Additives.

Georges R Younes1, Bentolhoda Heli1,2, Abdellah Ajji1

  • 1CREPEC, Département de Génie Chimique, Polytechnique Montréal, P.O. Box 6079, Station Centre-Ville, Montréal, QC H3C 3A7, Canada.

ACS Applied Engineering Materials
|March 5, 2026
PubMed
Summary
This summary is machine-generated.

This study enhances poly(lactic acid) (PLA) flexibility and hydrophobicity using polyhydroxyurethane (PHU) derived from polydimethylsiloxane (PDMS). The resulting blends show improved properties for sustainable packaging and face masks.

Keywords:
biofilm formationelectrospinningflexible packagingpoly(lactic acid)polyhydroxyurethanespolymer blending

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Poly(lactic acid) (PLA) is a biodegradable polymer with limitations in flexibility and hydrophobicity.
  • Enhancing PLA properties is crucial for expanding its applications in sustainable packaging and biomedical nonwoven materials.
  • Polydimethylsiloxane (PDMS) and polyhydroxyurethane (PHU) offer potential for polymer modification.

Purpose of the Study:

  • To investigate the use of PDMS-based PHU as an additive to improve PLA properties.
  • To enhance the flexibility, toughness, and hydrophobicity of PLA for specific applications.
  • To evaluate the suitability of PLA/PHU blends for biomedical nonwoven materials, such as face masks.

Main Methods:

  • Melt-blending of PLA with varying weight percentages of PDMS-based PHU.
  • Characterization using spectroscopic, thermal, rheological, morphological, and mechanical analyses.
  • Electrospinning of PLA/PHU blends and assessment of nonwoven mat properties and degradation behavior.

Main Results:

  • A 5 wt % PHU blend showed a 9-fold increase in elongation at break and an 18° increase in water contact angle.
  • Hydrogen bonding confirmed interactions between PLA and PHU, indicating partial miscibility.
  • Electrospun PLA/PHU mats exhibited superior hydrophobicity and smaller fiber/pore diameters compared to polypropylene (PP).
  • PLA/PHU blends demonstrated accelerated hydrolytic degradation and antibiofouling potential against Staphylococcus aureus and Pseudomonas aeruginosa.

Conclusions:

  • PDMS-based PHU effectively enhances PLA's flexibility and hydrophobicity.
  • PLA/PHU blends are promising for sustainable packaging and advanced biomedical nonwoven materials.
  • The developed materials show potential for use in face masks with improved performance and antibiofouling characteristics.