Microporous poly(vinylidene fluoride) hollow fiber membranes fabricated with Polar Clean as water-soluble green diluent and additives

Title
Microporous poly(vinylidene fluoride) hollow fiber membranes fabricated with Polar Clean as water-soluble green diluent and additives
Authors
이영무
Keywords
Thermally induced phase separation; Green diluent; Hollow fiber; Poly(vinylidene fluoride); PolarClean
Issue Date
2015-04
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MEMBRANE SCIENCE, v. 479, Page. 204-212
Abstract
Methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate (Rhodiasolv (R) PolarClean) as a water-soluble green solvent was used for the first time to prepare poly(vinylidine fluoride) (PVDF) hollow fiber membranes. Due to the solubility of PolarClean in water, a combination of thermally induced phase separation and non solvent induced phase separation was observed during the membrane formation. The effects of additives such as poly(vinyl pyrrolidone) (PVP) with different molecular weights (10k, 55k, 360k and 1300k) and glycerol (5 wt% and 15 wt%) were studied at different quenching bath temperatures (5, 15 and 25 degrees C). The properties of the hollow fiber membranes, such as their morphology, roughness, mechanical properties, overall porosity, vvater permeability, polymorphism in the skin layer and polymorphism in the bulk of the membrane structure were investigated as well. A phase diagram for the PVDF/PolarClean system showed the PVDF crystallization temperature around 53 degrees C. PolarClean along with additives induces porous structure and the formation of beta-polyrnorphs in the membranes, resulting in high water permeability. (c) 2015 Elsevier BM. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0376738815000472http://hdl.handle.net/20.500.11754/24008
ISSN
0376-7388; 1873-3123
DOI
http://dx.doi.org/10.1016/j.memsci.2015.01.031
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > DEPARTMENT OF ENERGY ENGINEERING(에너지공학과) > Articles
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