Cited by 121biodegradable polymer synthesis and propertiesChemical Synthesis and ReactionsPolymer crystallization and properties

Thermal Catalytic Depolymerization of Poly(L-Lactic Acid) Oligomer into LL-Lactide: Effects of Al, Ti, Zn and Zr Compounds as Catalysts.

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NODA, Masaki, OKUYAMA, Hisashi·1999·Chemical and Pharmaceutical Bulletin

Abstract

A series of Al, Ti, Zn and Zr compounds, i.e., their metal alkoxides, organic acid and enolate salts, halid and oxide, were evaluated as intramolecular transesterification catalysts for the thermal depolymerization reaction of poly(L-lactic acid) oligomer resulting in LL-lactide, meso-lactide and DD-lactide by gas chromatography using a β-cyclodexstrin chiral stationary phase capillary column. The activity of the intramolecular transesterification compared with that of stannous 2-ethylhexanoate was in the following order : Sn>Zn>Zr>Ti>Al.

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Crossref · 10.1248/cpb.47.467

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  • In the presence of 1 wt% Sn(Oct)2 or zinc naphthenate, L-LA was recovered within 2 h in ~90% yield and over 95% selectivity.

    “In the presence of 1 wt% Sn(Oct)2 or zinc naphthenate, L-LA was recovered within 2 h in ~ 90% yield and over 95% selectivity.450”

    From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [450]

  • Noda found that the yield and selectivity for L-LA were dependent on the nature of the metal and increased in an order of Al < Ti < Zr < Zn < Sn.

    “They found that the yield and selectivity for L-LA were dependent on the nature of the metal and increased in an order of Al < Ti < Zr < Zn < Sn.”

    From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [450]

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Authors
NODA, M., & OKUYAMA, H.
Affiliations
Shimadzu (Japan) (JP)
Venue
Chemical and Pharmaceutical Bulletin
Published
1999
Volume
47
Issue
4
Pages
467-471
ISSN
  • 0009-2363 (ISSN-L)
  • 1347-5223
OpenAlex
W2112686706
Cited by
121
References
1
Citations by year
2026: 2 · 2025: 6 · 2024: 7 · 2023: 6 · 2022: 7 · 2021: 3 · 2020: 7 · 2019: 3 · 2018: 3 · 2017: 11 · 2016: 6 · 2015: 6 · 2014: 4 · 2013: 9 · 2012: 4
FWCI
1.58
Type
journal article
Language
en
Open access
Locations
Chemical and Pharmaceutical Bulletin (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
  • Physical Sciences › Chemistry › Organic Chemistry › Chemical Synthesis and Reactions
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
Keywords
intramolecular transesterification, meso-lactide, metal alkoxides, oxide catalysts, catalyst activity comparison, β-cyclodextrin

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