Abstract
The poly(ethylene glycol)-based benzoxazine polymers were synthesized via a polycondensation reaction between Bisphenol-A, paraformaldehyde, and poly(ether diamine)/(Jeffamine®). The structures of the polymers were confirmed by proton nuclear magnetic resonance spectroscopy (1H-NMR), indicating the presence of a cyclic benzoxazine ring. The polymer solutions were casted on the glass plate and cross-linked via thermal treatment to produce tough and flexible films without using any external additives. Thermal properties and the crosslinking behaviour of these polymers were studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Single gas (H2, O2, N2, CO2, and CH4) transport properties of the crosslinked polymeric membranes were measured by the time-lag method. The crosslinked PEG-based polybenzoxazine membranes show improved selectivities for CO2/N2 and CO2/CH4 gas pairs. The good separation selectivities of these PEG-based polybenzoxazine materials suggest their utility as efficient thin film composite membranes for gas and liquid membrane separation technology.
Highlights
Membrane-based gas separation has attracted significant interest in the industrial sector due to its advantages over conventional separation methods
Main-chain Poly(ethylene glycol) (PEG) type polybenzoxazines were synthesized via the typical polycondensation reaction of a Jeffamine® with a 230, 600, and 900 g/mol molecular weight, Bisphenol-A, and paraformaldehyde [27,28,29,30,31], according to Scheme 1
The synthesis of PEG-based main-chain polybenzoxazine was dependent on the reaction of
Summary
Membrane-based gas separation has attracted significant interest in the industrial sector due to its advantages over conventional separation methods. The resulting point, the benzoxazine acts like an ordinary thermoplastic, which has good solubility, processability, polymer with repeating benzoxazine units in the main chain is formed. At this point, the benzoxazine and film formation properties. Upon curing an elevated temperature, this thermoplastic acts like an ordinary thermoplastic, whichathas good solubility, processability, and film polymer formation can be crosslinked via thermally activated ring-opening polymerization (ROP). Ring-opening polymerization (ROP) of the oxazine ring in the main polymer advantage thermoplastic processability with thermosetting characteristics.
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