Supercritical Fluid Synthesis of Highly Porous Polylactide Matrices: Fundamental Features and Technology of Formation, Development and Stabilization of Polymer Foams

The paper studies the formation, development and stabilization of the structure of foamed amorphous D,L-polylactide after a slow (quasi-isothermal) and a fast (quasi-adiabatic) relief of the pressure of supercritical carbon dioxide used as a plasticizing/foaming agent. The following regularities hav...

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Bibliographic Details
Published in:Russian journal of physical chemistry. B 2021-12, Vol.15 (8), p.1324-1328
Main Authors: Zimnyakov, D. A., Alonov, M. V., Ushakova, E. V., Ushakova, O. V., Popov, V. K., Minaev, N. V., Minaeva, S. A., Epifanov, E. O.
Format: Article
Language:English
Subjects:
Adiabatic flow
Carbon dioxide
Chemistry
Chemistry and Materials Science
Energy dissipation
Foaming agents
Internal energy
Internal friction
Nucleation
Physical Chemistry
Plastic foam
Polylactic acid
Polymers
Pressure reduction
Self-similarity
Stabilization
Supercritical fluids
Tissue engineering
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Summary:The paper studies the formation, development and stabilization of the structure of foamed amorphous D,L-polylactide after a slow (quasi-isothermal) and a fast (quasi-adiabatic) relief of the pressure of supercritical carbon dioxide used as a plasticizing/foaming agent. The following regularities have been established: (1) the values of the foam expansion factor in the process of quasi-adiabatic depressurization are significantly lower than in the quasi-isothermal regime because of significant dissipation of the “polymer–foaming agent” system internal energy due to the internal friction in the system; (2) an expansion-collapse effect is observed during the quasi-isothermal foaming; (3) at the intermediate stage between nucleation and intensive foam development, the pore nuclei growth in the plasticized polymer is self-similar. The results obtained are important for selecting foaming regimes that provide the synthesized highly porous matrices with the structural characteristics required for their use in regenerative medicine and tissue engineering.
ISSN:1990-7931
1990-7923
DOI:10.1134/S1990793121080182