TY - JOUR
T1 - Polymeric membranes composed of polystyrenes tethering amino acids for preferential CO 2 separation over H 2
AU - Taniguchi, Ikuo
AU - Ootera, Yuka
AU - Chowdhury, Firoz A.
AU - Tomizaki, Kin Ya
AU - Kai, Teruhiko
AU - Kazama, Shingo
N1 - Funding Information:
This research was funded by the Japanese Ministry of Economy, Trading & Industry. The authors thank Mrs. Rie Sugimoto of this institute for gas separation experiments.
PY - 2012/8
Y1 - 2012/8
N2 - Various N-tert-butoxycarbonyl (N-Boc) amino acids, such as glycine, valine, and serine, were combined to 4-chloromethylstyrene. The resulted monomers were readily polymerized to give polystyrenes tethering an amino acid by a conventional free radical polymerization technique. After deprotection of the N-Boc group with trifluoroacetic acid, the obtained polystyrene derivatives were soluble in ethanol and spin-coated on a commercial poly(ether sulfone) porous membrane to fabricate a composite membrane for CO 2 separation over H 2. The CO 2 selective layer of synthesized PSt was ca. 200 nm thick, and the composite membranes showed preferential CO 2 separation over H 2, while parent polystyrene passed through H 2 rather than CO 2. Especially, the separation factor aCO 2=H 2 was raised after alkaline treatment to form free primary amine on the terminus of graft chain. Serine tethered polystyrene showed the highest aCO 2=H 2 (16) among them, which suggested the hydroxyl group would enhance the CO 2 affinity of primary amine.
AB - Various N-tert-butoxycarbonyl (N-Boc) amino acids, such as glycine, valine, and serine, were combined to 4-chloromethylstyrene. The resulted monomers were readily polymerized to give polystyrenes tethering an amino acid by a conventional free radical polymerization technique. After deprotection of the N-Boc group with trifluoroacetic acid, the obtained polystyrene derivatives were soluble in ethanol and spin-coated on a commercial poly(ether sulfone) porous membrane to fabricate a composite membrane for CO 2 separation over H 2. The CO 2 selective layer of synthesized PSt was ca. 200 nm thick, and the composite membranes showed preferential CO 2 separation over H 2, while parent polystyrene passed through H 2 rather than CO 2. Especially, the separation factor aCO 2=H 2 was raised after alkaline treatment to form free primary amine on the terminus of graft chain. Serine tethered polystyrene showed the highest aCO 2=H 2 (16) among them, which suggested the hydroxyl group would enhance the CO 2 affinity of primary amine.
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U2 - 10.1007/s00289-012-0733-y
DO - 10.1007/s00289-012-0733-y
M3 - Article
AN - SCOPUS:84864605193
SN - 0170-0839
VL - 69
SP - 405
EP - 415
JO - Polymer Bulletin
JF - Polymer Bulletin
IS - 4
ER -