| 簡(jiǎn) 介： |
Polysulfone (PSf) membranes were prepared by the wet-phase-inversion using 1-
hexadecyl-3-methylimidazolium thiocyanate [C16mim][SCN] as an new additive.
Scanning electron microscope was utilized to visualize cross-sections of the
membranes to gain more better understanding the influence of [C16mim][SCN] on the
pore-forming. Moreover, Membrane-forming mechanism using ionic liquid as a poreformer
was also discussed. The results showed that ionic liquid [C16mim][SCN] had
restrained the demixing of the casting solutions and has the ability of the pore-forming,
higher than those of its analogues of PEG400. With increase of concentration of ionic
liquid [C16mim][SCN] in casting solutions, the structures of the membranes changed
from asymmetric finger pores to the spongy-finger-macrovoid structure of the pores.
Compared with PEG400 as a pore-former,[C16mim][SCN] has the pore-forming
ability to the membrane at lower concentration of [C16mim][SCN] in the casting
solution. Especially, at the 4:76 ratio of [C16mim][SCN]/NMP, the prepared membrane
has the asymmetric finger-pores structure, with the 2~6μm pores close to surface layer
and the 10~24μm pore for its sublayer. Its retention rate of PEG10000 and solution
flux are 97.1% and 48.7 L· h-1· m-2. Meanwhile, ionic liquid can be a plasticizer,
according the thermal properties of the membranes. |
