Journal
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B
Volume 8, Issue 7, Pages 924-931Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1990793114070057
Keywords
supercritical carbon dioxide; polylactide; atomic force spectroscopy of polymers
Categories
Funding
- Russian Foundation for Basic Research [13-03-00429, 11-02-12185, 13-03-12046_ofi-m]
Ask authors/readers for more resources
The microstructure and properties of amorphous D,L-polylactide subjected to different treatments in supercritical carbon dioxide (SC-CO2) were investigated. Atomic force microscopy analysis demonstrated that plasticization and subsequent foaming of the polymer in SC-CO2 leads to significant changes in its internal structure, which are caused by the rearrangement of the supramolecular structure of polylactic acid. The formation of micro and meso pores and an accompanying increase of polylactide void volume are directly related to the destruction of polymer initial intermolecular bonds during the release of SC-CO2. These changes facilitate the formation of thermodynamically more stable conformations, which is manifested in a significant (1.7-5.0-fold) increase of the values of exothermic effects registered by differential scanning calorimetry in the temperature range from -30 to -10A degrees C and near 30-40A degrees C.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available