Phase Separation within a Thin Layer of Polymer Solution as Prompt Technique to Predict Membrane Morphology and Transport Properties
Abstract
:1. Introduction
2. Materials and Methods
2.1. List of Symbols and Acronyms
- LLDP—liquid–liquid displacement porometry;
- NIPS—non–solvent induced phase separation;
- NMP—N–methyl–2–pyrrolidone;
- PAA—polyamic acid;
- PI—polyimide;
- PSD—pore size distribution;
- SEM—scanning electron microscopy;
- d—total thickness of the polymer layer, µm;
- t—time, s;
- v—deposition rate in limited layer, μm/s;
- D—diameter, nm;
- γ—interfacial tension, 10−3 N/m;
- θ—contact angle, °;
- J1—flux of the displacing liquid in the presence of the wetting liquid, L/m2 h;
- J2—flux the displacing liquid only, L/m2 h;
- Δp—differential pressure, bar;
- η—viscosity, mPa∙s;
- P—permeance, kg/m2 h bar;
- C—concentration, wt.%.
2.2. Materials
2.3. PAA Synthesis
2.4. Ternary Phase Diagrams
2.5. Determination of Precipitation Rate
2.6. Preparation of Flat Asymmetric Membranes Based on PAA
2.7. Scanning Electron Microscopy
2.8. Study of Pore Size and Membrane Permeance
3. Results
3.1. Phase Inversion of Polymer/Solvent Solution
3.2. Phase Inversion of Polymer/Solvent/Non-solvent Solution
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Anokhina, T.; Borisov, I.; Yushkin, A.; Vaganov, G.; Didenko, A.; Volkov, A. Phase Separation within a Thin Layer of Polymer Solution as Prompt Technique to Predict Membrane Morphology and Transport Properties. Polymers 2020, 12, 2785. https://doi.org/10.3390/polym12122785
Anokhina T, Borisov I, Yushkin A, Vaganov G, Didenko A, Volkov A. Phase Separation within a Thin Layer of Polymer Solution as Prompt Technique to Predict Membrane Morphology and Transport Properties. Polymers. 2020; 12(12):2785. https://doi.org/10.3390/polym12122785
Chicago/Turabian StyleAnokhina, Tatiana, Ilya Borisov, Alexey Yushkin, Gleb Vaganov, Andrey Didenko, and Alexey Volkov. 2020. "Phase Separation within a Thin Layer of Polymer Solution as Prompt Technique to Predict Membrane Morphology and Transport Properties" Polymers 12, no. 12: 2785. https://doi.org/10.3390/polym12122785