Spectroscopic characterization of cellulose acetate polymer membranes containing Cu(1,3-butadiene) OTf as a facilitated olefin transport carrier

Authors
Kim, HSKim, YJKim, JJLee, SDKang, YSChin, CS
Issue Date
2001-05
Publisher
AMER CHEMICAL SOC
Citation
CHEMISTRY OF MATERIALS, v.13, no.5, pp.1720 - 1725
Abstract
Polymer-metal complexes composed of Cu(1,3-butadiene)OTf and cellulose acetate (CA), Cu-CA, have been successfully applied to facilitated olefin transport membranes for the olefin/paraffin separation, and the reversible solid-state interactions of Cu+ ions with cellulose acetate (CA) and olefins have been observed using FT-IR and UV spectroscopy. FT-IR study clearly shows that the Cu+ ions in the Cu-CA membrane are coordinated by the carbonyl groups of CA. Upon incorporation of Cut 1,3-butadiene)OTf into CA, the carbonyl stretching frequency of CA at 1753 cm(-1) shifts to a lower frequency at around 1702 cm(-1) and the degree of coordination increases with increasing amounts of Cu(l,3-butadiene)OTf. The Cu+-carbonyl interaction is found to be significantly affected by the coordination of an olefin, suggesting that the olefin and carbonyl group compete with each other for the coordination to Cu+ ions. Reversible olefin coordination to Cu+ ions in the Cu-CA membranes has been observed by FT-IR and UV studies. Treatment of the Cu-CA membrane with propylene, ethylene, or 1,3-butadiene produces a corresponding olefin-coordinated membrane in which the coordinated olefin is easily replaced by another olefin.
Keywords
COMPLEX MEMBRANES; SILVER SALTS; SEPARATION; PROPYLENE; KINETICS; DRY; COMPLEX MEMBRANES; SILVER SALTS; SEPARATION; PROPYLENE; KINETICS; DRY; Cu(1; 3-butadiene)OTf
ISSN
0897-4756
URI
https://pubs.kist.re.kr/handle/201004/140504
DOI
10.1021/cm000807q
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KIST Article > 2001
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