Teruhiko Kai

Polymeric membranes composed of polystyrenes tethering amino acids for preferential CO 2 separation over H 2

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 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

Development of commercial-sized dendrimer composite membrane modules for CO2 removal from flue gas

\alpha_{{{\text{CO}}_{ 2} /{\text{H}}_{ 2} }}

Development of cesium-incorporated carbon membranes for CO2 separation under humid conditions

was raised after alkaline treatment to form free primary amine on the terminus of graft chain. Serine tethered polystyrene showed the highest

A CO2-selective molecular gate of poly(amidoamine) dendrimer immobilized in a poly(ethylene glycol) network

\alpha_{{{\text{CO}}_{ 2} /{\text{H}}_{ 2} }}

A compatible crosslinker for enhancement of CO2 capture of poly(amidoamine) dendrimer-containing polymeric membranes

(16) among them, which suggested the hydroxyl group would enhance the CO2 affinity of primary amine.