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Polydimethylsiloxane-Based Composites with Photo-Autocatalytic Properties: Surface Photooxidation, Hydrophobicity, and Nanomechanical Properties.

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Title: Polydimethylsiloxane-Based Composites with Photo-Autocatalytic Properties: Surface Photooxidation, Hydrophobicity, and Nanomechanical Properties.
Authors: Avadanei, Mihaela Iuliana1 (AUTHOR) zaltariov.mirela@icmpp.ro, Zaltariov, Mirela-Fernanda1,2 (AUTHOR), Stoica, Iuliana1,3 (AUTHOR), Varganici, Cristian-Dragos1 (AUTHOR), Ciolacu, Diana Elena1,2 (AUTHOR), Spiridon, Iuliana1,3 (AUTHOR), Fifere, Adrian2 (AUTHOR), Avadanei, Ovidiu Gabriel3 (AUTHOR)
Source: Polymers (20734360). Jun2026, Vol. 18 Issue 11, p1334. 28p.
Subjects: Photodegradation, Photooxidation, Polydimethylsiloxane, Photocatalysis, Reactive oxygen species, Metal complexes, Nanomechanics, Ligands (Chemistry)
Abstract: A synergistic approach to the photodegradation of polydimethylsiloxane-based composites upon photoaging was implemented by using La(III) complexes of Schiff base ligands with a silicon-containing spacer as fillers. The analysis methods were spectral, nanomechanical, and morphological. The results show that the accelerated oxidative degradation of the polydimethylsiloxane matrix is due to the combined actions of radicals, fragments, and photoproducts derived from the photolysis of the La(III) complexes and the water vapors in the photoaging chamber. Compared to the undoped polydimethylsiloxane, the photo-excited radical intermediates and photoproducts of the La(III) complexes, with aromatic or quinone structures, in ground or in excited state, have acted as photocatalysts and as new sources for reactive intermediates and for the generation of reactive oxygen species. Infrared, electron spin resonance, and nanomechanical investigations revealed that the chemistry of the photoaged surfaces comprises oxygen–containing species, photoreaction products, and an extended siloxane network with embedded ligand fragments. The key role of La(III) complexes in promoting the generation of reactive species is described. The study highlights the unexplored potential of La(III) complexes of Schiff base ligands bearing a silane/siloxane spacer as potential catalysts in the photodegradation of polymers and plastics. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Polydimethylsiloxane-Based Composites with Photo-Autocatalytic Properties: Surface Photooxidation, Hydrophobicity, and Nanomechanical Properties.
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  Data: <searchLink fieldCode="DE" term="%22Photodegradation%22">Photodegradation</searchLink><br /><searchLink fieldCode="DE" term="%22Photooxidation%22">Photooxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Polydimethylsiloxane%22">Polydimethylsiloxane</searchLink><br /><searchLink fieldCode="DE" term="%22Photocatalysis%22">Photocatalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Reactive+oxygen+species%22">Reactive oxygen species</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+complexes%22">Metal complexes</searchLink><br /><searchLink fieldCode="DE" term="%22Nanomechanics%22">Nanomechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Ligands+%28Chemistry%29%22">Ligands (Chemistry)</searchLink>
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  Label: Abstract
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  Data: A synergistic approach to the photodegradation of polydimethylsiloxane-based composites upon photoaging was implemented by using La(III) complexes of Schiff base ligands with a silicon-containing spacer as fillers. The analysis methods were spectral, nanomechanical, and morphological. The results show that the accelerated oxidative degradation of the polydimethylsiloxane matrix is due to the combined actions of radicals, fragments, and photoproducts derived from the photolysis of the La(III) complexes and the water vapors in the photoaging chamber. Compared to the undoped polydimethylsiloxane, the photo-excited radical intermediates and photoproducts of the La(III) complexes, with aromatic or quinone structures, in ground or in excited state, have acted as photocatalysts and as new sources for reactive intermediates and for the generation of reactive oxygen species. Infrared, electron spin resonance, and nanomechanical investigations revealed that the chemistry of the photoaged surfaces comprises oxygen–containing species, photoreaction products, and an extended siloxane network with embedded ligand fragments. The key role of La(III) complexes in promoting the generation of reactive species is described. The study highlights the unexplored potential of La(III) complexes of Schiff base ligands bearing a silane/siloxane spacer as potential catalysts in the photodegradation of polymers and plastics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/polym18111334
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      – Code: eng
        Text: English
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        PageCount: 28
        StartPage: 1334
    Subjects:
      – SubjectFull: Photodegradation
        Type: general
      – SubjectFull: Photooxidation
        Type: general
      – SubjectFull: Polydimethylsiloxane
        Type: general
      – SubjectFull: Photocatalysis
        Type: general
      – SubjectFull: Reactive oxygen species
        Type: general
      – SubjectFull: Metal complexes
        Type: general
      – SubjectFull: Nanomechanics
        Type: general
      – SubjectFull: Ligands (Chemistry)
        Type: general
    Titles:
      – TitleFull: Polydimethylsiloxane-Based Composites with Photo-Autocatalytic Properties: Surface Photooxidation, Hydrophobicity, and Nanomechanical Properties.
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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