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<p>As weak properties of polymer blends may be attributed to phase separation and low compatibility of a dispersed polylactic acid (PLA) phase in the polyethylene glycol (PEG) matrix, this study reports on the role of TiO<sub>2</sub> nanoparticles (NPs) on property enhancement of PEG/(PLA-TiO<sub>2</sub>) nanocomposites. After the synthesis of rutile TiO<sub>2</sub> NPs (40 to 80&#xa0;nm), the nanocomposites were prepared by solution casting of PEG and (PLA-TiO<sub>2</sub>) having a ratio PEG/PLA = 70/30 and 0, 1, 3, and 5 wt.-% TiO<sub>2</sub> NPs. The TiO<sub>2</sub> NPs improve phase dispersion and interfacial adhesion in parallel with an increase in crystallinity, degradation temperature and melting temperature towards maximum values at a concentration of 3 wt.-% TiO<sub>2</sub>. The ultraviolet absorption was enhanced, and the optical bandgap energy progressively reduced from 4.21&#xa0;eV to 2.82&#xa0;eV at 5 wt.-% TiO<sub>2</sub>. Rheological tests showed a sixfold increase in storage modulus, indicating strong elastic behaviour in parallel with a stable solid-like region between 10 and 60&#xa0;°C and a gel-like transition between 70 and 80&#xa0;°C. Antibacterial tests showed the highest activity at 1 wt.-% TiO<sub>2</sub> against <i>E. coli</i> and <i>S. aureus</i>. Findings confirm that the PEG/PLA nanocomposites with TiO<sub>2</sub> NPs maintain enhanced thermal stability, ultraviolet shielding, antibacterial activity and mechanical strength, being promising for biomedical, environmental, or packaging applications.</p>

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Synthesis and characterization of PEG/(PLA-TiO2) nanocomposites: effect of TiO2 nanoparticles on physicochemical, rheological and antibacterial properties

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Tassadit Benkacem,
  • Salim Hammani,
  • Meriem Ould Rebai,
  • Sihem Daikhi,
  • Pieter Samyn,
  • Mikhael Bechelany,
  • Ahmed Barhoum

摘要

As weak properties of polymer blends may be attributed to phase separation and low compatibility of a dispersed polylactic acid (PLA) phase in the polyethylene glycol (PEG) matrix, this study reports on the role of TiO2 nanoparticles (NPs) on property enhancement of PEG/(PLA-TiO2) nanocomposites. After the synthesis of rutile TiO2 NPs (40 to 80 nm), the nanocomposites were prepared by solution casting of PEG and (PLA-TiO2) having a ratio PEG/PLA = 70/30 and 0, 1, 3, and 5 wt.-% TiO2 NPs. The TiO2 NPs improve phase dispersion and interfacial adhesion in parallel with an increase in crystallinity, degradation temperature and melting temperature towards maximum values at a concentration of 3 wt.-% TiO2. The ultraviolet absorption was enhanced, and the optical bandgap energy progressively reduced from 4.21 eV to 2.82 eV at 5 wt.-% TiO2. Rheological tests showed a sixfold increase in storage modulus, indicating strong elastic behaviour in parallel with a stable solid-like region between 10 and 60 °C and a gel-like transition between 70 and 80 °C. Antibacterial tests showed the highest activity at 1 wt.-% TiO2 against E. coli and S. aureus. Findings confirm that the PEG/PLA nanocomposites with TiO2 NPs maintain enhanced thermal stability, ultraviolet shielding, antibacterial activity and mechanical strength, being promising for biomedical, environmental, or packaging applications.