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Experimental Study for the Sorption and Diffusion of Supercritical Carbon Dioxide into Polyetherimide
Wei-Heng Huang1, Pei-Hua Chen2,3, Chin-Wen Chen4
1Department of Chemical and Materials Engineering, Chinese Culture University, Taipei 111396, Taiwan.
Molecules (Basel, Switzerland)
|September 14, 2024
Summary
Supercritical carbon dioxide (SCCO2) sorption into polyetherimide (PEI) was studied. SCCO2 increased PEI
Area of Science:
- Polymer Science
- Materials Science
- Chemical Engineering
Background:
- Supercritical carbon dioxide (SCCO2) is an eco-friendly fluid utilized in various polymer applications.
- Understanding SCCO2 sorption and dissolution in polymers is crucial for optimizing these applications.
Purpose of the Study:
- To investigate the sorption and diffusion behavior of SCCO2 in polyetherimide (PEI).
- To determine the mass diffusivity and analyze the sorption mechanism under varying conditions.
Main Methods:
- Ex situ gravimetric method to measure SCCO2 sorption and desorption in PEI.
- Fickian diffusion model application to calculate mass diffusivity.
- FTIR analysis and loss modulus measurements to assess polymer changes.
Main Results:
- SCCO2 sorption in PEI was quantified at temperatures from 40-60 °C and pressures from 20-40 MPa.
- Equilibrium mass gain ranged from 9.0 to 12.8 wt%, increasing with pressure and decreasing with temperature.
- A crossover phenomenon in isotherms and changes in sorption mechanism were observed around 840 kg/m³ SCCO2 density.
- FTIR and mechanical tests indicated SCCO2-induced plasticization of PEI.
Conclusions:
- SCCO2 sorption and diffusion in PEI are dependent on temperature, pressure, and density.
- The study demonstrates the plasticization of PEI by SCCO2, offering insights for material processing.
- The findings provide essential data for utilizing SCCO2 in PEI applications.
