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Silica-Supported Zinc(II)–Schiff-Base Catalysts for Lactide Ring-Opening Polymerization: Influence of Support Morphology and Ligand Substituents.

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Title: Silica-Supported Zinc(II)–Schiff-Base Catalysts for Lactide Ring-Opening Polymerization: Influence of Support Morphology and Ligand Substituents.
Authors: González, Darío M.1 (AUTHOR) dario.gonzalez@pucv.cl, Picero, Felipe1,2 (AUTHOR), Fuentes, Ornella1 (AUTHOR), Oyarce, Jocelyn1,2 (AUTHOR), Blázquez-Blázquez, Enrique2 (AUTHOR)
Source: Polymers (20734360). Mar2026, Vol. 18 Issue 6, p737. 15p.
Subjects: Ring-opening polymerization, Heterogeneous catalysts, Metal complexes, Heterogeneous catalysis, Ligands (Chemistry), Biodegradable materials, Polylactic acid
Abstract: Silica-supported zinc (II)–Schiff-base complexes were prepared through a simple and high-yield immobilization strategy and evaluated as heterogeneous catalysts for the ring-opening polymerization (ROP) of lactide. Silica gel and silica nanoparticles were employed as supports to assess the influence of support morphology and textural properties on catalytic performance. Comprehensive characterization by AAS, BET, SEM, and SEM–EDS confirmed effective anchoring of the Zn complexes, homogeneous metal distribution, and support-dependent textural modifications. The supported catalysts were active in the bulk ROP of racemic and enantiopure lactide, affording PLA with high conversions and moderate dispersities. Silica-gel-supported systems exhibited high and reproducible activity over a wide range of conditions, whereas catalysts supported on silica nanoparticles showed a stronger dependence on reaction time and ligand electronic effects, highlighting the key role of the support in modulating active site accessibility and chain growth. Microstructural and thermal analyses confirmed the formation of atactic PLA from rac-lactide and stereoregular PLLA from L-lactide. Overall, this study demonstrates that silica-supported zinc(II)–Schiff-base complexes constitute an effective and versatile heterogeneous platform for lactide ROP and underscore the importance of support properties in the rational design of sustainable catalysts for biodegradable polyester synthesis. [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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  Label: Title
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  Data: Silica-Supported Zinc(II)–Schiff-Base Catalysts for Lactide Ring-Opening Polymerization: Influence of Support Morphology and Ligand Substituents.
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  Data: <searchLink fieldCode="AR" term="%22González%2C+Darío+M%2E%22">González, Darío M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dario.gonzalez@pucv.cl</i><br /><searchLink fieldCode="AR" term="%22Picero%2C+Felipe%22">Picero, Felipe</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fuentes%2C+Ornella%22">Fuentes, Ornella</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Oyarce%2C+Jocelyn%22">Oyarce, Jocelyn</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Blázquez-Blázquez%2C+Enrique%22">Blázquez-Blázquez, Enrique</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Mar2026, Vol. 18 Issue 6, p737. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Ring-opening+polymerization%22">Ring-opening polymerization</searchLink><br /><searchLink fieldCode="DE" term="%22Heterogeneous+catalysts%22">Heterogeneous catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+complexes%22">Metal complexes</searchLink><br /><searchLink fieldCode="DE" term="%22Heterogeneous+catalysis%22">Heterogeneous catalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Ligands+%28Chemistry%29%22">Ligands (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Biodegradable+materials%22">Biodegradable materials</searchLink><br /><searchLink fieldCode="DE" term="%22Polylactic+acid%22">Polylactic acid</searchLink>
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  Label: Abstract
  Group: Ab
  Data: Silica-supported zinc (II)–Schiff-base complexes were prepared through a simple and high-yield immobilization strategy and evaluated as heterogeneous catalysts for the ring-opening polymerization (ROP) of lactide. Silica gel and silica nanoparticles were employed as supports to assess the influence of support morphology and textural properties on catalytic performance. Comprehensive characterization by AAS, BET, SEM, and SEM–EDS confirmed effective anchoring of the Zn complexes, homogeneous metal distribution, and support-dependent textural modifications. The supported catalysts were active in the bulk ROP of racemic and enantiopure lactide, affording PLA with high conversions and moderate dispersities. Silica-gel-supported systems exhibited high and reproducible activity over a wide range of conditions, whereas catalysts supported on silica nanoparticles showed a stronger dependence on reaction time and ligand electronic effects, highlighting the key role of the support in modulating active site accessibility and chain growth. Microstructural and thermal analyses confirmed the formation of atactic PLA from rac-lactide and stereoregular PLLA from L-lactide. Overall, this study demonstrates that silica-supported zinc(II)–Schiff-base complexes constitute an effective and versatile heterogeneous platform for lactide ROP and underscore the importance of support properties in the rational design of sustainable catalysts for biodegradable polyester synthesis. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  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/polym18060737
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        Text: English
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        StartPage: 737
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      – SubjectFull: Ring-opening polymerization
        Type: general
      – SubjectFull: Heterogeneous catalysts
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      – SubjectFull: Metal complexes
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      – SubjectFull: Heterogeneous catalysis
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      – SubjectFull: Ligands (Chemistry)
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      – SubjectFull: Biodegradable materials
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      – SubjectFull: Polylactic acid
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    Titles:
      – TitleFull: Silica-Supported Zinc(II)–Schiff-Base Catalysts for Lactide Ring-Opening Polymerization: Influence of Support Morphology and Ligand Substituents.
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            NameFull: González, Darío M.
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            NameFull: Picero, Felipe
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              Text: Mar2026
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              Y: 2026
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