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Controlling polylactide stereocomplex (sc-PLA) self-assembly: From microspheres to nanoparticles.

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Title: Controlling polylactide stereocomplex (sc-PLA) self-assembly: From microspheres to nanoparticles.
Authors: Michalski, Adam1, Makowski, Tomasz2, Biedroń, Tadeusz1, Brzeziński, Marek1 mbrzezin@cbmm.lodz.pl, Biela, Tadeusz1 tadek@cbmm.lodz.pl
Source: Polymer. May2016, Vol. 90, p242-248. 7p.
Subjects: Polylactic acid, Molecular self-assembly, Star-branched polymers, Stereochemistry, Nanoparticles, Linear polymers, Ring-opening polymerization, Imidazoles
Abstract: Linear and star-shaped polymers have been synthesized by the controlled ring-opening (ROP) polymerization of l - and d -lactide using 1-methyl-2-hydroxymethyl-3-butylimidazolium tetrafluoroborate and dipentaerythritol as initiators, respectively. To introduce carboxylic end-groups onto the star-shaped polylactides, the reaction of –OH end-groups with succinic anhydride was employed. Afterwards, the starting and modified polylactides were used for the preparation of star-shaped and star-shaped/linear stereocomplexes in 1,4-dioxane and tetrahydrofuran (THF). In these solvents, the stereocomplexes spontaneously precipitated. Star-shaped stereocomplexes with hydroxyl end-groups formed microspheres with diameters ranging from 1 to 4 μm (depending on the initial concentration of sc-PLA components) following precipitation from THF. However, the combined effect of the nature of the end-groups and PLA architecture causes the formation of uniform stereocomplex nanoparticles (∼400 nm) in 1,4-dioxane from the combination of star-shaped PLA functionalized with carboxylic end-groups and linear PLA with ionic liquid end-groups. Microscopic analysis showed that nanometre-sized grains of stereocomplexes (∼30 nm) aggregated to form larger stereocomplex nanoparticles. It was observed that the combination of three factors, i.e., the end-group interactions, architecture of the enantiomeric components, and basicity of the solvent in which the stereocomplexes are prepared, influences the properties and morphology of the final stereocomplex-based materials. [ABSTRACT FROM AUTHOR]
Copyright of Polymer is the property of Elsevier B.V. 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 114176605
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  Data: Controlling polylactide stereocomplex (sc-PLA) self-assembly: From microspheres to nanoparticles.
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  Data: <searchLink fieldCode="JN" term="%22Polymer%22">Polymer</searchLink>. May2016, Vol. 90, p242-248. 7p.
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  Data: Linear and star-shaped polymers have been synthesized by the controlled ring-opening (ROP) polymerization of l - and d -lactide using 1-methyl-2-hydroxymethyl-3-butylimidazolium tetrafluoroborate and dipentaerythritol as initiators, respectively. To introduce carboxylic end-groups onto the star-shaped polylactides, the reaction of –OH end-groups with succinic anhydride was employed. Afterwards, the starting and modified polylactides were used for the preparation of star-shaped and star-shaped/linear stereocomplexes in 1,4-dioxane and tetrahydrofuran (THF). In these solvents, the stereocomplexes spontaneously precipitated. Star-shaped stereocomplexes with hydroxyl end-groups formed microspheres with diameters ranging from 1 to 4 μm (depending on the initial concentration of sc-PLA components) following precipitation from THF. However, the combined effect of the nature of the end-groups and PLA architecture causes the formation of uniform stereocomplex nanoparticles (∼400 nm) in 1,4-dioxane from the combination of star-shaped PLA functionalized with carboxylic end-groups and linear PLA with ionic liquid end-groups. Microscopic analysis showed that nanometre-sized grains of stereocomplexes (∼30 nm) aggregated to form larger stereocomplex nanoparticles. It was observed that the combination of three factors, i.e., the end-group interactions, architecture of the enantiomeric components, and basicity of the solvent in which the stereocomplexes are prepared, influences the properties and morphology of the final stereocomplex-based materials. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Polymer is the property of Elsevier B.V. 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.polymer.2016.03.049
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 242
    Subjects:
      – SubjectFull: Polylactic acid
        Type: general
      – SubjectFull: Molecular self-assembly
        Type: general
      – SubjectFull: Star-branched polymers
        Type: general
      – SubjectFull: Stereochemistry
        Type: general
      – SubjectFull: Nanoparticles
        Type: general
      – SubjectFull: Linear polymers
        Type: general
      – SubjectFull: Ring-opening polymerization
        Type: general
      – SubjectFull: Imidazoles
        Type: general
    Titles:
      – TitleFull: Controlling polylactide stereocomplex (sc-PLA) self-assembly: From microspheres to nanoparticles.
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            NameFull: Michalski, Adam
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            NameFull: Makowski, Tomasz
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            NameFull: Biedroń, Tadeusz
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            NameFull: Brzeziński, Marek
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            NameFull: Biela, Tadeusz
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              M: 05
              Text: May2016
              Type: published
              Y: 2016
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