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Effects of neutralization with Et3Al on structure and properties in sulfonated styrenic pentablock copolymers
- Source :
- Journal of Membrane Science. 428:516-522
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
Abstract
- The effect of neutralization with Et 3 Al on morphologies in a sulfonated pentablock copolymer solution and cast membrane was investigated using small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The sulfonated pentablock copolymer in a non-polar solvent mixture (cyclohexane/heptane) persists as spherical micelles after neutralization where the micelle core of sulfonated polystyrene (SS) incorporates Al (3+) ions and the corona is solvated hydrogenated isoprene (HI) and t -butylstyrene ( t BS). Membranes cast from this micellar solution exhibit a bicontinuous microphase separated morphology with interconnected SS microdomains. The aluminum-neutralized membrane with a continuous transport channel shows excellent water vapor transport rate (WVTR) (22 kg/(m 2 day)), which is comparable to the WVTR of membranes in the sulfonic acid form. The strong interaction between Al(3+) ions and the sulfonic acid group in the aluminum-neutralized membrane results in significantly lower water uptake (∼30 wt%) that provides much-improved mechanical stability in the wet state.
- Subjects :
- chemistry.chemical_classification
Heptane
Materials science
Cyclohexane
Small-angle X-ray scattering
Filtration and Separation
Sulfonic acid
Biochemistry
Micelle
chemistry.chemical_compound
Membrane
chemistry
Polymer chemistry
Copolymer
General Materials Science
Polystyrene
Physical and Theoretical Chemistry
Subjects
Details
- ISSN :
- 03767388
- Volume :
- 428
- Database :
- OpenAIRE
- Journal :
- Journal of Membrane Science
- Accession number :
- edsair.doi...........224b04c4d02b92dbd51380fe1f3aa059