Preparation of poly(ether‐block‐amide)/poly(amide‐co‐poly(propylene glycol)) random copolymer blend membranes for CO₂/N₂ separation

Abstract

A series of poly(amide‐co‐poly(propylene glycol)) (PA‐PPG) random copolymers with different content of PPG were designed by polycondensation reaction. These random copolymers were blended up to 60% with commercially available Pebax 2533. The blend membranes were characterized by Fourier‐transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), scanning electron microscope (SEM). Gas permeation properties of these blend membranes were investigated using five single‐gases (CO2, H2, O2, CH4, and N2) at different temperature of 25–55°C and 1.0 atm. The impacts of content of PA‐PPG with different PPG content and operating temperature on CO2 separation properties of Pebax/PA‐PPG blend membranes were studied. The results showed that CO2 permeability gradually increased with the increasing operating temperature, whereas CO2 permeability gradually decreased with the increase in content of PA‐PPG. CO2/N2 selectivity gradually increased with the increase in content of PA‐PPG. In particular, Pebax/PA‐PPG (50)–60% displayed excellent CO2 and O2 separation properties (PCO2 = 79.7 Barrer and PO2 = 13.6 Barrer, CO2/N2 = 34.7 and O2/N2 = 5.9) at 25°C and 1.0 atm. POLYM. ENG. SCI., 59:E14–E23, 2019. © 2018 Society of Plastics Engineers

Double-Layered Pebax® 3533/ZIF-8 Membranes with Single-Walled Carbon Nanotube Buckypapers as Support for Gas Separation

“…On the basis of this model, the apparent activation energies for the permeation of CO 2 and N 2 are 13.8 kJ·mol −1 and 35.1 kJ·mol −1 , respectively. These results are in concordance with the reported values for Pebax ® 3533 membranes, prepared on polymeric supports, of 14.2 kJ·mol −1 for CO 2 and 29.6 kJ·mol −1 for N 2 [ 29 ] and justify the reduction in selectivity with the temperature due to the higher activation energy for N 2 with respect to CO 2 [ 42 ]. It must be taken into account that permeance is proportional to diffusion and solubility, and these two factors affect the defined apparent activation energy.…”

Facile Synthesis of Thermoplastic Polyamide Elastomers Based on Amorphous Polyetheramine with Damping Performance

“…Shibasaki et al reported a monodisperse poly(N-methyl benzamide) copolymerized with PPG diamine in solution to afford non-hydrogen-bondable block copolymers, which are non-crystalline materials but showing weak tensile modulus [ 35 ]. Luo et al prepared fluorene-based PA-PPG membranes via solution polycondensation with high carbon dioxide permeability [ 36 , 37 ].…”

Preparation, characterization, and CO2 permeation testing of cellulose acetate and polyimide blend membranes

“…As a result, we can attain specific and desirable characteristics that may be challenging to achieve using a single type of polymer. 5 Despite their advantages, polymer blends have limitations, which is their molecular miscibility. The properties of the blends such as molecular state of dispersion, the morphology of various phases, and the characteristics of the final products are all influenced by thermodynamics.…”

“…25 Reijerkerk et al have reported improvement of 5 factors in CO 2 permeability (530 Barrer) on blending 1:1 ratio of PDMS/PEG polymer for CO 2 / CH 4 . 26 Zhu et al 5 investigated the blending of random copolymers of poly(amide-co-poly(propylene glycol)) (PA-PPG) with Pebax 2533. When compared to pure Pebax 2533, the Pebax/PA-PPG 50%-60% blend membrane improved CO 2 /N 2 selectivity by 68.4%.…”

“…When compared to pure Pebax 2533, the Pebax/PA-PPG 50%-60% blend membrane improved CO 2 /N 2 selectivity by 68.4%. 5 Mosleh et al blended Pebax ® 1657/PES and reported that with increase in weight percent of the glassy polymer in the blend membranes has improved the selectivity and reduced the pure gas permeability. 27 There are some a notable research gap remains in the systematic investigation of blend membranes.…”