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Modeling of Two‐Step Supercritical CO 2 Foaming to Fabricate Poly( ε ‐caprolactone) Scaffolds
Author(s) -
Hatami Tahmasb,
Mei Lucia Helena Innocentini,
Shabanian Seyed Reza
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202100006
Subject(s) - cabin pressurization , supercritical fluid , polycaprolactone , bar (unit) , materials science , radius , conservation of mass , chemical engineering , thermodynamics , composite material , chemistry , engineering , organic chemistry , geology , computer science , polymer , oceanography , computer security , physics
A mathematical model was developed based on the Amon and Denson model for supercritical foaming (SCF) with a two‐step depressurization rate. The model was provided according to the law of conservation of momentum, the law of conservation of mass, and a reformulation of the shell size for the second step of depressurization in comparison with the shell size for the first step of depressurization. The model was validated using the experimental data of SCF from polycaprolactone plus CO 2 at 300 bar, 50 °C, a solubilization time of 2 h, a first depressurization rate of 28.6 bar min −1 , and a second depressurization rate of 200 bar min −1 . The comparison showed a significant improvement of the model accuracy for predicting the average pore radius of the scaffold compared to the original Amon and Denson model.