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Influence of solvent and nanoparticles on the morphology and gas separation properties of copolyimide membranes
Author(s) -
Maghami Saeid,
Sadeghi Morteza,
Khoshkam Milad,
Chenar Mahdi Pourafshari
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49337
Subject(s) - membrane , polyimide , selectivity , gas separation , solvent , dimethylacetamide , nanoparticle , chemical engineering , materials science , dimethylformamide , polymer chemistry , chemistry , organic chemistry , layer (electronics) , nanotechnology , catalysis , biochemistry , engineering
Abstract In this study, the effect of solvent type and nanoparticles of silica and zeolite 4A on the gas separation properties of polyimide (PI) membranes were investigated. Gas separation of the membranes based on pure solvents of dimethylformamide (DMF), n ‐methyl‐2‐pirrolidone (NMP), dimethylacetamide (DMAc), and dimethylsulfoxide (DMSO) were studied. The prepared PI membranes using DMAc and DMSO showed the highest selectivity and permeability, respectively. In this regard, the influence of their mixing on transport properties of the PI was evaluated. The prepared membrane using the mixture of DMSO/DMAc with the volume ratio of 1:3 showed the best gas separation performance in comparison to the Robeson's upper bound. Incorporation of 20 wt% of silica and zeolite 4A nanoparticles into the PI membrane indicated that the selectivity of CO 2 /CH 4 increased from 39.4 to 57.6 and 68.5, respectively. Besides, gas transport properties of the PI‐based mixed matrix membranes were satisfactory predicted by modified Maxwell model. Furthermore, characteristic parameters of the encapsulated particles by interfacial layer were determined.