Solubility, swelling degree and crystallinity of carbon dioxide–polypropylene system

Drug loading of polymer implants by supercritical CO 2 assisted impregnation: A review

“…This effect can be counterbalanced by the decrease of CO 2 density with temperature under isobaric conditions [78][79][80] and by the CO 2 -induced recrystallization in semicrystalline polymers [81,82]. Nevertheless, if the temperature approaches the melting temperature of semi-crystalline polymers T m the crystals melt which increases the amorphous regions in the polymer and so the CO 2 sorption and the swelling [83].…”

Polymer foaming with chemical blowing agents: Experiment and modeling

“…Then, cylindrical samples of 9 mm height (h i ) and 20 mm diameter (/) were fabricated in a steel mold by compression under a pressure of 20 MPa at 60 C for 30 min. A total number of six samples, three groups of two samples with the same CBA, were fabricated, with a volume V i of 2.83 cm 3 . The density of all the samples (q sample ) was about 0.905 g/cm 3 , with a densification value up to 99.9%, calculated as: …”

“…q F represents the foam density, and q P the solid polymer density (0.91 g/cm 3 ). V f represents the final volume of the sample after shrinkage.…”

Modified quadrupole Cubic Plus Association Equation of State (mqCPA EoS) for thermodynamic modeling of polymer-supercritical CO2 systems

“…Liu and Tomasko [35] used SL EoS to correlate the experimental data of CO 2 sorption isotherms for the induced polymer (PLGA) swelling systems. Lei et al [36] used both SL and the groupcontribution lattice-fluid (GCLF) equations of state to correlate the solubility of CO 2 in molten state of polypropylene (PP). Both these EOSs could correlate the data to within 5% average relative deviation in conjunction with a temperature-dependent interaction parameter.…”