Enhanced Gas Separation Performance by Embedding Submicron Poly(ethylene glycol) Capsules into Polyetherimide Membrane
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-021-2521-3 Chinese J. Polym. Sci.
Enhanced Gas Separation Performance by Embedding Submicron Poly(ethylene glycol) Capsules into Polyetherimide Membrane Ying-Ying Maa, Min Liua, Jing-Tao Wanga, Bin Zhua, and Yi-Fan Lia,b* a School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China b College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
Abstract Recently, hollow filler as an emerging concept is attracting more attention in preparation of mixed matrix membranes (MMMs). Herein, poly(ethylene glycol) microcapsules (PMC) are synthesized via distillation precipitation polymerization and embedded into the polyetherimide (Ultem®1000) matrix to fabricate MMMs for CO2 capture. The PMC exhibits a preferential hollow structure within the Ultem matrix to furnish highways within membrane, and thus achieve high gas permeability. Meanwhile, the favorable affinity of poly(ethylene glycol) (PEG) microcapsule with ether oxygen group (EO) towards CO2 enhances the CO2 solubility selectivity. Such integration of physical and chemical microenvironments in the as-designed PEG microcapsule affords highly enhanced CO2 separation performance. Compared to pristine Ultem®1000, the membrane with 2.5 wt% PMC loading exhibits 310% increment in CO2 permeability and 22% increment in CO2/N2 selectivity, which shows the promising prospects of designing PEG-containing microcapsules as the filler of MMMs for CO2 capture. Keywords Mixed matrix membranes (MMMs); Poly(ethylene glycol) microcapsules (PMC); Polyetherimide (Ultem®1000); CO2 capture Citation: Ma, Y. Y.; Liu, M.; Wang, J. T.; Zhu, B.; Li, Y. F. Enhanced gas separation performance by embedding submicron poly(ethylene glycol) capsules into polyetherimide membrane. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-021-2521-3
INTRODUCTION With the growing awareness of the reason and the detrimental sequence of greenhouse effect, rapid and selective capture of CO2 from diverse gas mixtures has become an urgent demand, especially in the cases of post-combustion capture, natural gas sweetening, and precombustion capture.[1−3] Membrane technologies have shown unique superiority in the field of CO2 capture over traditional processes on account of high efficiency, low energy consumption and easy operation.[3] Nevertheless, membrane materials with high gas separation performance, mechanical property and long-term stability are highly required to ensure practical application.[4] Among various membrane materials, glassy polymers like cellulose acetate, polyimide, polyetherimide, polycarbonate, and poly(ether sulfone) are usually considered candidates for commercialization due to the satisfactory selectivity and mechanical stability. More importantly, these polymers can be fabricated into asymmetric membrane with thin selective skin layer via phase conversion method.[5−8] However, most of these glassy polymers, especially those with abundant availability, suffer from their low intrinsic gas permeabi
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