Gas sorption and transport properties of the membrane from polycarbonate/CoIII acetylacetonate blend

Confinement effect in PC/MXD6 multilayer films: Impact of the microlayered structure on water and gas barrier properties

“…The permeability coefficients for the PC monolayer film and PC/PC multilayer films are gathered in Table 2. Similar values between the two films and those of literature [40][41][42][43][44] are obtained, whatever the gas tested. Moreover, as stated by Van Krevelen [45], the well-known tendency in the comparison of gas permeability ranking is observed: P CO2 > P O2 > P N2 .…”

Development of ternary-component mixed-matrix membranes for advanced gas separations

“…However, the peak at 800 cm −1 corresponds to the para-substitution of the benzene ring, whereas the presence of the triazine ring in SNW-1 was further verified at the 1300 cm −1 , 1400 cm −1 ,and 1550 cm −1 spectrum bands, suggesting that a successful reaction between terephthalaldehyde and melamine had taken place [85,94]. The structure of Co(acac) 3 was further verified from the FTIR measurement (Figure 4-3 (b)), with the structure comparable to the results reported in the literature [82]. Further, based on the TGA analysis (Figure 4-3(c)), both SNW-1 and Co(acac) 3 have been observed to be thermally stable up to 450 °C and 230°C, respectively, indicating that the C−N bond formed between terephthalaldehyde and melamine in the formation of SNW-1, and the ionic bonding between Co 3+ and acac 3− , are strong enough to withstand the fabrication of mixed-matrix membrane with an annealing process at 160 °C.…”

“…Therefore, in this work, cobalt (III) acetylacetonate (Co(acac) 3 ) was used as it is not only well-dispersed in common organic solvents but also readily available. With the appropriate choice of a polymer matrix, the interaction of metal ions with the carbonyl groups in the polymer matrix can facilitate the selective transport of oxygen molecules, thus increasing O 2 /N 2 selectivity [82], which can be achieved even with a small loading of Co(acac) 3 . Hence, ODPA-TMPDA (ODPA=4,4'-oxydiphthalic anhydride; TMPDA=2,4,6-trimethyl-m-phenylenediamine) polyimide was selected as the polymer matrix in this study.…”

“…This result implies that an appropriate medium (e.g. polymer matrix) is required to allow the selective transport of O 2 (against N 2 ) in the membrane [82].…”

Controlling Nanoscale Pore Size and Wall Composition in Polycarbonate Membranes via Atomic Layer Deposition and Sequential Infiltration Synthesis: Implications for High Water Permeance

“…Figure a shows the FTIR absorption spectrum for a bare PCTE membrane, and the inset shows the polycarbonate molecular structure. Of particular note are the C–H stretching peaks at 3200–2700 cm –1 , the CO stretching peak at 1775 cm –1 , the CC stretching vibration for the phenyl rings at 1500 cm –1 , the asymmetric O–C–O deformations in the range of ∼1280–1150 cm –1 , and the symmetric O–C–O deformation at 1013 cm –1 . − The PCTE membrane was subjected to multiple TMA exposure/purge steps in succession with the integrated TMA dose time ranging from 5 to 680 s, and FTIR absorbance spectra were recorded following each TMA exposure. The experimental conditions for these measurements are summarized in Table S2 (left).…”