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Waterborne poly(urethane‐urea) gas permeation membranes for CO 2 /CH 4 separation
Author(s) -
Reis Rodrigo A.,
Pereira Juliana H. C.,
Campos Antoniel C. C.,
Barboza Elaine M.,
Delpech Marcia C.,
Cesar Deborah V.,
Dahmouche Karim,
Bandeira Cirlene F.
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46003
Subject(s) - membrane , ethylene glycol , copolymer , polymer chemistry , peg ratio , urea , materials science , permeation , gas separation , ether , polyvinyl alcohol , aqueous solution , chemical engineering , hydrogen bond , polymer , chemistry , molecule , organic chemistry , composite material , biochemistry , finance , engineering , economics
In this work, dense membranes from aqueous dispersions of poly(urethane‐urea) (PUU) based on poly(propylene glycol) (PPG) and a block copolymer composed of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG), EG‐ b ‐PG, with 7 wt % of the former were obtained. Nonpolluting formulations were synthesized with proportions of PPG and EG‐ b ‐PG as 1:0, 1:1, 1:3, and 3:1 in terms of equivalent number ratios. The effect of small and gradual increases in PEG segments was evaluated for the permeability of pure CO 2 , CH 4 , and N 2 , at room temperature. Slight increases in PEG‐based segments in PUU promoted some remarkable properties, which led to a simultaneous increase in CO 2 permeability and ideal selectivity for CH 4 (300%) and N 2 (380%). Infrared spectroscopy showed that the PEG portions induced hydrogen bonds between NH of urethane and ether groups in the PEG portions, which promoted ordering of the flexible segments, confirmed by X‐ray diffractometry and small‐angle X‐ray scattering. Diffractometry techniques also confirmed the absence of crystalline domains, as did dynamic mechanical analysis. The produced membranes showed performance above Robeson's 2008 upper bound and seemed to be a superior polymeric material for CO 2 /CH 4 and CO 2 /N 2 separation. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46003.