scholarly journals Production of polylactic acid aerogels via phase separation and supercritical CO2 drying: thermodynamic analysis of the gelation and drying process

2021 ◽  
Author(s):  
Alberto Bueno ◽  
Christian Luebbert ◽  
Sabine Enders ◽  
Gabriele Sadowski ◽  
Irina Smirnova
Keyword(s):  
Phase Separation ◽  
Polylactic Acid ◽  
Ternary Phase ◽  
Life Science ◽  
Drying Process ◽  
Gel Structure ◽  
Crystallinity Degree ◽  
Application Range ◽  
Ternary Phase Diagrams ◽  
Supercritical Co2 Drying

AbstractThe application range of aerogels, especially in the life-science sector, can be extended by utilizing biocompatible polymers such as polylactic acid (PLA). However, the low glass transition temperature (Tg) of PLA and the challenging gelation techniques limit the application of supercritical CO2 (scCO2) drying and thus the PLA-aerogel production. The aim of this work is to overcome this challenge and to provide a better understanding of the thermodynamics of the process. Therefore, the gelation of amorphous PLA (PDLLA) and semicrystalline PLA (PLLA) via thermal-induced phase separation (TIPS) was studied. To identify polymer/solvent/antisolvent ratios suitable for gelation, thermodynamic modeling (PC-SAFT) was used to describe the corresponding ternary phase diagrams. scCO2 drying was used to preserve the mesoporous gel structure formed during the gelation. Due to the decrease in the Tg of PLA in the presence of CO2, this could not be applied to all gels. It was found that the critical parameter to enable the scCO2 drying of low Tg polymers is the crystallinity degree (Xc) of the polymer. Based on these results, some guidelines for producing aerogels from polymers with low Tg are formulated. Graphical abstract

scholarly journals Editorial on Special Issues “Aerogels” and “Aerogels 2018”

Gels ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 19
Author(s):  
Françoise Quignard ◽  
Nathalie Tanchoux
Keyword(s):  
Porous Structure ◽  
Supercritical Co2 ◽  
Freeze Drying ◽  
Drying Process ◽  
Gel Structure ◽  
Supercritical Co2 Drying

Aerogels can be defined as ultralight materials with a 3D porous structure, similar to their parent wet gels, where the solvent has been replaced by a gas without a collapse of the gel structure, thanks to the drying process used (supercritical CO2 drying, freeze drying, etc [...]

The use of acoustic spectroscopy in the characterisation of ternary phase diagrams

2013 ◽  
Vol 441 (1-2) ◽  
pp. 603-610 ◽  
Author(s):  
Giulia Bonacucina ◽  
Marco Cespi ◽  
Giovanna Mencarelli ◽  
Luca Casettari ◽  
Giovanni F. Palmieri
Keyword(s):  
Phase Diagrams ◽  
Ternary Phase ◽  
Ternary Phase Diagrams ◽  
Acoustic Spectroscopy

Effect of short-chain alcohols as co-surfactants on pseudo-ternary phase diagrams containing lecithin

1999 ◽  
Vol 16 (3) ◽  
pp. 377-381 ◽  
Author(s):  
Suk-Young Choi ◽  
Seong-Geun Oh ◽  
Seong-Youl Bae ◽  
Sei-Ki Moon
Keyword(s):  
Phase Diagrams ◽  
Ternary Phase ◽  
Short Chain ◽  
Ternary Phase Diagrams

scholarly journals Synchrotron X-ray In Situ Tomography of Thermally Induced Phase Separation of Polylactic Acid in 1,4-Dioxane Solution

2018 ◽  
Vol 18 (12) ◽  
pp. 7496-7503 ◽  
Author(s):  
Swann Gay ◽  
Brice Calvignac ◽  
Landry Ouanssi Kamtcheu ◽  
Thomas Beuvier ◽  
Elodie Boller ◽  
...  
Keyword(s):  
Phase Separation ◽  
Polylactic Acid ◽  
Dioxane Solution ◽  
Thermally Induced Phase Separation ◽  
Thermally Induced ◽  
X Ray

scholarly journals A New 1:1 Drug-Drug Cocrystal of Theophylline and Aspirin: Discovery, Characterization, and Construction of Ternary Phase Diagrams

2018 ◽  
Vol 18 (12) ◽  
pp. 7526-7532 ◽  
Author(s):  
Shaza Darwish ◽  
Jacek Zeglinski ◽  
Gamidi Rama Krishna ◽  
Rahamatullah Shaikh ◽  
Majeda Khraisheh ◽  
...  
Keyword(s):  
Phase Diagrams ◽  
Ternary Phase ◽  
Ternary Phase Diagrams

scholarly journals Effects of solvent sort on casting solution and morphology of poly(ether sulfones) filtration membrane

2020 ◽  
Author(s):  
Kai Fan ◽  
Chun Liu ◽  
Haijun Yang ◽  
Zhengchi Hou
Keyword(s):  
Phase Diagram ◽  
Phase Separation ◽  
Shear Viscosity ◽  
Ternary Phase ◽  
Ternary Phase Diagram ◽  
Viscosity Measurement ◽  
Micro Structure ◽  
Filtration Membranes ◽  
Filtration Membrane ◽  
Thermodynamics And Dynamics

Abstract Four kinds of solvent were chosen to prepare poly(ether sulfones) (PES) filtration membranes by the nonsolvent induced phase separation (NIPS) method. Ternary phase diagram and shear viscosity measurement were conducted to analyse the formation of prepared membrane from thermodynamic and kinetic perspectives. The micro-structure of the membranes with different solvents were analysed, and the result showed a high relevance to the thermodynamics and dynamics of the casting solutions, and promoted the proposal of a reasonable membrane formation mechanism.

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