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- Title
Formation of Polysulfone Hollow Fiber Membranes Using the Systems with Lower Critical Solution Temperature.
- Authors
Plisko, Tatiana V.; Bildyukevich, Alexandr V.; Zhao, Liang; Huang, Weiqing; Volkov, Vladimir V.; Huang, Zuohua; Roy, Sagar
- Abstract
This study deals with the investigation of the phase state of the polymer systems from polysulfone (PSF) with the addition of polyethylene glycol (PEG-400, Mn = 400 g·mol−1) and polyvinylpyrrolidone (PVP K-30, Mn = 40,000 g·mol−1) in N,N-dimethylacetamide (DMA), which feature lower critical solution temperatures (LCSTs). A fragment of the phase state diagram of the system PSF —PEG-400—PVP K-30—DMA was experimentally constructed in the following range of component concentrations: PSF 20–24 wt.%, PEG-400—35–38 wt.% and PVP—0–8 wt.%. It has been established that PVP addition substantially reduces the phase separation temperature down to 50–60 °C. Based on the obtained phase diagrams, a method for preparation of highly permeable hollow fiber membranes from PSF, which involves the processing of the dope solution at a temperature close to the LCST and the temperature of the bore fluid above the LCST, was proposed. Hollow fiber membranes with pure water flux of 1200 L·m−2·h−1 and a sponge-like macrovoid-free structure were obtained via LCST-thermally induced phase separation by free fall spinning technique.
- Subjects
HOLLOW fibers; CRITICAL temperature; PHASE separation; PHASE diagrams; POLYETHYLENE glycol
- Publication
Fibers, 2021, Vol 9, Issue 5, p28
- ISSN
2079-6439
- Publication type
Article
- DOI
10.3390/fib9050028