Affiliation:
1. Organic Material Synthesis Laboratory Department of Chemistry Incheon National University Incheon 22012 South Korea
2. Research Institute of Basic Sciences Incheon National University Incheon 22012 South Korea
3. Department of Chemistry Pabna University of Science and Technology Pabna 6600 Bangladesh
Abstract
AbstractA series of poly(ethylene glycol)‐block‐poly(propylene glycol) (PEG/PPG)‐ and 5,6‐di(9H‐carbazol‐9‐yl)isoindoline‐1,3‐dione (2CZPImide)‐based crosslinked rubbery polymer membranes, denoted as PEG/PPG‐2CZPImide (x:y), are prepared from the norbornene‐functionalized PEG/PPG oligomer (NB‐PEG/PPG‐NB) and 2‐(bicyclo[2.2.1]hept‐5‐en‐2‐ylmethyl)‐5,6‐di(9H‐carbazol‐9‐yl)isoindoline‐1,3‐dione (2CZPImide‐NB) via ring‐opening metathesis polymerization (ROMP). The molar ratio (x:y) of the NB‐PEG/PPG‐NB (x) to 2CZPImide‐NB (y) monomers is varied from 10:1 to 6:1. X‐ray diffraction (XRD), scanning electron microscopy‐energy dispersive X‐ray spectroscopy (SEM‐EDS), and pure gas permeability studies reveal that the comonomer 2CZPImide‐NB successfully increases the d‐spacing among the crystalline PEG/PPG segments, hence enhancing the diffusivity of gases through the membranes. The synthesized membranes exhibit good CO2 separation performance, with CO2 permeabilities ranging from 311.1 to 418.1 Barrer and CO2/N2 and CO2/CH4 selectivities of 39.4–52.0 and 13.4–16.0, respectively, approaching the 2008 Robeson upper bound. Moreover, PEG/PPG‐2CZPImide (6:1), displaying optimal CO2 permeability and CO2/N2 and CO2/CH4 selectivities, shows long‐term stability against physical aging and plasticization resistance up to 20 days and 10 atm, respectively.
Funder
National Research Foundation of Korea
Ministry of Education