Preparation of defect-free asymmetric gas separation membranes with dihydrolevoglucosenone (CyreneTM) as a greener polar aprotic solvent
نویسندگان
چکیده
Nonsolvent-induced phase separation (NIPS) is widely used to prepare asymmetric gas membranes. Most industrial NIPS casting solution formulations are limited a small group of glassy polymers and, importantly, require toxic polar aprotic solvents such as N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), or N-methyl-2-pyrrolidone (NMP). Growing restrictions on the use spurring search for more benign that do not compromise membrane performance. This study reports high-flux, defect-free polysulfone (PSf) membranes prepared using dihydrolevoglucosenone (CyreneTM), solvent believed be safer than DMAc, DMF, and NMP, majority component. Optimized conditions produce with hydrogen permeances exceeding 100 permeance units (GPU) selectivities at above those dense PSf films. Dry/wet performance improved shorter dry step times increased CyreneTM loadings relative volatile solvent, tetrahydrofuran (THF), in solution. The high water-CyreneTM Flory-Huggins interaction parameter, χ12, viscosities help suppress formation skin layer defects sublayer macrovoids. In some cases, were influenced by substructure resistance, providing insight into relationship between morphology
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ژورنال
عنوان ژورنال: Journal of Membrane Science
سال: 2022
ISSN: ['1873-3123', '0376-7388']
DOI: https://doi.org/10.1016/j.memsci.2021.120173