View in EDS HTML Full Text PDF Full Text

Depolymerization of Polycarbonates by Transesterification without Using Base, Ionic Liquid, and Additives.

Saved in:
Bibliographic Details
Title: Depolymerization of Polycarbonates by Transesterification without Using Base, Ionic Liquid, and Additives.
Authors: Yamada, Kazuki1 (AUTHOR), Komine, Nobuyuki1 (AUTHOR), Hirano, Masafumi1 (AUTHOR) hrc@cc.tuat.ac.jp
Source: ChemCatChem. 12/6/2024, Vol. 16 Issue 23, p1-9. 9p.
Subjects: Ethylene carbonates, Compact discs, Polycarbonates, Surface reactions, Depolymerization
Abstract: La(III)‐catalyzed depolymerization of polycarbonates produces the raw carbonates and diols by transesterification without the use of bases, ionic liquids or additives. Poly(bisphenol A carbonate) (1 a) is depolymerized by [La(acac)3] (acac: acetylacetonate) (1 mol %) in MeOH at 135 °C for 20 min to give dimethyl carbonate (2 a) (95 %) and bisphenol A (3 a) (93 %). This reaction can also be carried out in the air using MeOH as received and on a 10 gram‐scale. A commercial compact disk (CD) can also be depolymerized quantitatively. Depolymerization of 1 a in EtOH or 1,2‐propanediol produces corresponding carbonate with 3 a. Poly(ethylene carbonate) (1 b) and poly(propylene carbonate) (1 c) are converted into dimethyl carbonate and corresponding glycols in high yields in MeOH. The kinetic study suggests the surface reaction mechanism for the La(III)‐catalyzed depolymerization of 1 a. [ABSTRACT FROM AUTHOR]
Copyright of ChemCatChem is the property of Wiley-Blackwell 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
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: egs
DbLabel: Engineering Source
An: 181517569
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Depolymerization of Polycarbonates by Transesterification without Using Base, Ionic Liquid, and Additives.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Yamada%2C+Kazuki%22">Yamada, Kazuki</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Komine%2C+Nobuyuki%22">Komine, Nobuyuki</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hirano%2C+Masafumi%22">Hirano, Masafumi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hrc@cc.tuat.ac.jp</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22ChemCatChem%22">ChemCatChem</searchLink>. 12/6/2024, Vol. 16 Issue 23, p1-9. 9p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Ethylene+carbonates%22">Ethylene carbonates</searchLink><br /><searchLink fieldCode="DE" term="%22Compact+discs%22">Compact discs</searchLink><br /><searchLink fieldCode="DE" term="%22Polycarbonates%22">Polycarbonates</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+reactions%22">Surface reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Depolymerization%22">Depolymerization</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: La(III)‐catalyzed depolymerization of polycarbonates produces the raw carbonates and diols by transesterification without the use of bases, ionic liquids or additives. Poly(bisphenol A carbonate) (1 a) is depolymerized by [La(acac)3] (acac: acetylacetonate) (1 mol %) in MeOH at 135 °C for 20 min to give dimethyl carbonate (2 a) (95 %) and bisphenol A (3 a) (93 %). This reaction can also be carried out in the air using MeOH as received and on a 10 gram‐scale. A commercial compact disk (CD) can also be depolymerized quantitatively. Depolymerization of 1 a in EtOH or 1,2‐propanediol produces corresponding carbonate with 3 a. Poly(ethylene carbonate) (1 b) and poly(propylene carbonate) (1 c) are converted into dimethyl carbonate and corresponding glycols in high yields in MeOH. The kinetic study suggests the surface reaction mechanism for the La(III)‐catalyzed depolymerization of 1 a. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of ChemCatChem is the property of Wiley-Blackwell 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=181517569
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1002/cctc.202400870
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 9
        StartPage: 1
    Subjects:
      – SubjectFull: Ethylene carbonates
        Type: general
      – SubjectFull: Compact discs
        Type: general
      – SubjectFull: Polycarbonates
        Type: general
      – SubjectFull: Surface reactions
        Type: general
      – SubjectFull: Depolymerization
        Type: general
    Titles:
      – TitleFull: Depolymerization of Polycarbonates by Transesterification without Using Base, Ionic Liquid, and Additives.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Yamada, Kazuki
      – PersonEntity:
          Name:
            NameFull: Komine, Nobuyuki
      – PersonEntity:
          Name:
            NameFull: Hirano, Masafumi
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 06
              M: 12
              Text: 12/6/2024
              Type: published
              Y: 2024
          Identifiers:
            – Type: issn-print
              Value: 18673880
          Numbering:
            – Type: volume
              Value: 16
            – Type: issue
              Value: 23
          Titles:
            – TitleFull: ChemCatChem
              Type: main
ResultId 1