Authors: Ikuo Taniguchi Yuka Ootera Firoz A Chowdhury Kinya Tomizaki Teruhiko Kai Shingo Kazama
Publish Date: 2012/03/10
Volume: 69, Issue: 4, Pages: 405-415
Abstract
Various Ntertbutoxycarbonyl NBoc amino acids such as glycine valine and serine were combined to 4chloromethylstyrene The resulted monomers were readily polymerized to give polystyrenes tethering an amino acid by a conventional free radical polymerization technique After deprotection of the NBoc group with trifluoroacetic acid the obtained polystyrene derivatives were soluble in ethanol and spincoated on a commercial polyether sulfone porous membrane to fabricate a composite membrane for CO2 separation over H2 The CO2 selective layer of synthesized PSt was ca 200 nm thick and the composite membranes showed preferential CO2 separation over H2 while parent polystyrene passed through H2 rather than CO2 Especially the separation factor alpha textCO 2 /textH 2 was raised after alkaline treatment to form free primary amine on the terminus of graft chain Serine tethered polystyrene showed the highest alpha textCO 2 /textH 2 16 among them which suggested the hydroxyl group would enhance the CO2 affinity of primary amine
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