Effects of monomer rigidity on microstructures and properties of novel polyamide thin-film composite membranes prepared through interfacial polymerization for pervaporation dehydration
Journal
Journal of Membrane Science
Journal Volume
657
Date Issued
2022
Author(s)
Abstract
In this study, thin-film composite (TFC) membranes were produced through interfacial polymerization between diamine and trimesoyl chloride on a polyetherimide (PEI) support. The TFC membranes with different diamines, 4,4′-((propane-2,2-diylbis(4,1-phenylene))bis(oxy))dianiline (BAPP), 4,4′-((methylene bis(4,1-phenylene))bis(oxy))dianiline (MPDA), and 6,6′-bis(4-aminopheoxy)-4,4,4′,4′,7,7′-hexamethyl-2,2′-spirobichroman (SBC), were denoted as TFCPEI/B, TFCPEI/M, and TFCPEI/S, respectively. These three aromatic diamines have different central moieties that affect reactivity during the interfacial polymerization reaction. The crosslinking degree of the TFC membranes increased in the following order: TFCPEI/S < TFCPEI/M < TFCPEI/B. Positron annihilation lifetime spectroscopy analysis also unveils that TFCPEI/B had the lowest free volume. These results reveal that the appropriate steric structure of the diamine molecules can create less compact structure without impeding the formation of the crosslinked polyamide selective layer. Moreover, the TFCPEI/B membrane had a flux of approximately 705 ± 46 g∙m−2 h−1, and the water concentration in the permeate was maintained at approximately 99.8 wt% at 25°C during the 70 wt% isopropanol solution dehydration. Furthermore, the TFCPEI/B membrane can be operated under broad operating conditions and possesses high long-term stability. © 2022 Elsevier B.V.
Subjects
Alcohol; Interfacial polymerization; Membrane separation; Pervaporation; Polyetherimide
Other Subjects
Amines; Chlorine compounds; Composite membranes; Dehydration; Evaporation; Polymerization; Positron annihilation spectroscopy; Thin films; Aromatic diamine; Interfacial polymerization; Membrane separation; Microstructure and properties; Novel polyamides; Pervaporation dehydration; Polyamide thin films; Thin film composite membranes; Thin film composites; Trimesoyl chloride; Pervaporation; 2 propanol; chloride; diamine; monomer; polyamide; Article; concentration (parameter); controlled study; cross linking; membrane; pervaporation; polymerization; positron annihilation lifetime spectroscopy; rigidity; stereospecificity; synthesis; thin film (procedure); Amines; Chlorine Compounds; Dehydration; Evaporation; Polymerization; Thin Films
Type
journal article