Recent progress in the design of advanced PEO-containing membranes for CO2 removal

Gas permeation, sorption and diffusion through PEBA/SiO 2 nanocomposite membranes (chemical surface modification of nanoparticles)

“…Zoppi et al [22] prepared hybrid organiceinorganic films using the solegel process. They used PEBA1657 as an organic matrix and SiO 2 nanoparticles were prepared by hydrolysis and polycondensation of TEOS.…”

A strategy to enhance CO2 permeability of well-defined hyper-branched polymers with dense polyoxyethylene comb graft

“…The longer POE chain does not show crystalline nature in this case, which is known to suppress gas permeation [20]. Hyper-branched polymers were obtained by the following 2-step polymerization process.…”

“…Although various POE-containing polymers have been used for matrices of CO 2 separation membranes, high molecular weight POE (M n >2,000) shows more crystalline nature, which often reduces the CO 2 separation performance [20,53]. The average EO units of POEM used in this study was 9, and thus the POE is not considered crystalline, and flows under ambient conditions.…”

“…POE-containing block copolymers (for example Pebax, a linear multiblock of POE and poly(ester-amide) segments) have been developed as membrane materials for CO 2 capture [8][9][10] due to the inherent CO 2 -philic nature of POE [11]. Among the POE-containing polymers, POE is mostly incorporated into the polymer backbone [8][9][10][12][13][14][15][16][17][18][19][20], which reduces flexibility of the POE block in comparison to tethering onto a polymer backbone, which may cause a decrease of CO 2 diffusion. In addition, POEs with molecular weight over 2,000 display increased crystallinity, which also decreases the gas diffusivity [20].…”

“…Among the POE-containing polymers, POE is mostly incorporated into the polymer backbone [8][9][10][12][13][14][15][16][17][18][19][20], which reduces flexibility of the POE block in comparison to tethering onto a polymer backbone, which may cause a decrease of CO 2 diffusion. In addition, POEs with molecular weight over 2,000 display increased crystallinity, which also decreases the gas diffusivity [20]. To date it has been challenging to introduce amorphous or low molecular weight POE with higher weight fraction into polymer matrices.…”