Relation between network structure and gas transport in crosslinked poly(propylene glycol diacrylate)

Tuning of mass transport properties of multi-block copolymers for CO2 capture applications

“…This can be attributed to the extra methyl side group in PPO compared to PEO, which prevents close chain packing (leading to soft phase crystallization), thus increasing the free volume and gas permeability [19]. The permeability of all gases increases with increasing soft segment length (and concentration) and its relative change increases with increasing kinetic diameter as already observed for PEO x -T T block copolymers.…”

“…This hypothesis is supported by Freeman et al, who investigated the relationship between the free volume and the gas permeability in crosslinked networks of PEGDA (polyethylene based) and PPGDA (polypropylene based). They found significantly higher free volume in the PPGDA based networks accompanied by corresponding higher permeability values [19,23,24].…”

“…Higher CO2 permeability represents higher temperature (increasing from −10 • C to 50 • C in 15 • C steps). CO2/N2 selectivity as a function of CO2 permeability at 35 • C for ( ) PEO based block copolymers with monodisperse long T6T6T hard segments as described by Husken et al [11] and (᭹) PEOx, PPOx or mixtures of PEO2000 and PPO2200 based block copolymers with monodisperse short hard segment (T T), as used in this article compared with ( ) PEO based block copolymers [6], ( ) commercially available PEBAX ® [2], ( ) pure PEO di(meth)acrylate crosslinked networks [23][24][25] and ( ) pure PPO diacrylate networks [19], as described in literature. the microscale, improves the performance of the membrane at the macro scale.…”

Polymeric membranes for the hydrogen economy: Contemporary approaches and prospects for the future

“…Strategies to overcome the crystallization effect of pure PEO membranes have been investigated. For instance, Freeman's group developed the PEO-containing polymer as a CO 2 -selective membrane by increasing the percentage of ethylene oxide (EO) units and crosslinking the synthesized polymers [93,[105][106][107][108][109][110]. Utilizing the quadrupolar properties of CO 2 and the favorable interactions between CO 2 and the EO units, Lin et al [93] synthesized highly branched and crosslinked poly(ethylene oxide).…”

“…Despite the similarity in the chemical structures of PPO and PEO, the gas-separation performance of the former is inferior. Raharjo et al [110] studied a series of crosslinked PPO copolymers, and the highest CO 2 /H 2 selectivity obtained was 4.7 at 35 • C (9.4 for the crosslinked PEO copolymer). Therefore, the crosslinked PEO copolymer seems a better material for fabricating high-performance CO 2 -selective membranes than the crosslinked PPO copolymer.…”