The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Thermal Behavior of Poly(L-lactide) Having Low L-Isomer Content of 94% after Compressed CO2 Treatment

På svenska

Author

  • Qiaofeng Lan
  • Jian Yu
  • Jiasong He
  • Frans Maurer
  • Jun Zhang

Summary, in English

The effect of compressed CO2 treatment on the thermal behavior of poly(L-lactide) (PLLA) with low L-isomer content of 94% was studied by using differential scanning calorimetry (DSC) and temperature modulated DSC. It was shown that the treated samples displayed rich thermal transition signals during DSC heating, which is differ from the PLLA having high L-isomer content, including enthalpy relaxation, endothermic annealing, melting-recrystallization process, and cold crystallization. The results suggested that the crystalline phase obtained has less perfection and low crystallinity regardless of the treatment conditions because of the low crystallizability of the PLLA. This PLLA was induced to crystallize after treatment under CO2 at 2 MPa and temperature >= 65 degrees C and at pressures of 4-16 MPa and temperatures as low as 0 degrees C. At 2 MPa, the alpha crystal form is formed predominantly in the crystallized samples. The results also indicated that the ELLA-CO2 system exhibited the property of retrograde vitrification.

Publishing year

2010

Language

English

Pages

8602-8609

Publication/Series

Macromolecules

Volume

43

Issue

20

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Chemical Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 0024-9297