Amphiphilic micelle-forming PDMS-PEGBEM comb copolymer self-assembly to tailor the interlamellar nanospaces of defective poly(ethylene oxide) membranes

Miso Kang, Hyo Jun Min, Na Un Kim, Jong Hak Kim

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8 Citations (Scopus)

Abstract

An amphiphilic comb copolymer was synthesized via free-radical polymerization using two macromonomers: monomethacryloxypropyl-terminated poly(dimethyl siloxane) (PDMS-MA, 10,000 g mol−1) and poly(ethylene glycol)–behenyl ether methacrylate (PEGBEM, 1500 g mol−1). The PDMS-PEGBEM comb copolymer underwent self-assembly to form micellar structures in ethanol/tetrahydrofuran solvent. The micelle-forming PDMS-PEGBEM copolymer was incorporated into the low-cost, commercially available polymer, and non-selective polymer poly(ethylene oxide) (PEO, 106 g mol−1), resulting in highly selective all-polymeric membranes. The alignment of the PDMS-PEGBEM micelles in the interlamellar region of PEO and the corresponding increase in the domain spacing were observed by transmission electron microscopy and small-angle X-ray scattering, confirming the successful encapsulation of PDMS-PEGBEM in the interlamellar region. The PDMS functions as a rubbery filler between the crystallites, whereas PEGBEM has good affinity towards PEO because of their chemical similarity. The CO2/N2 and CO2/CH4 selectivities of PEO membranes was significantly enhanced from 0.78 and 0.71 to 41.7 and 13.3, respectively, on the loading of 10 wt.% of the copolymer. The highest CO2 permeability reached 240 barrer at 50 wt.% copolymer loading, with the CO2/N2 and CO2/CH4 selectivities of 34.6 and 12.2, respectively. Herein, the evolution of the interlamellar nanospaces and dual-phase region, as well as the microstructures of the membranes are reported.

Original languageEnglish
Article number117892
JournalSeparation and Purification Technology
Volume257
DOIs
Publication statusPublished - 2021 Feb 15

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation

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