Mixed matrix membranes consisting of ZIF-8 in rubbery amphiphilic copolymer: Simultaneous improvement in permeability and selectivity

Dong A. Kang, Kihoon Kim, Jung Yup Lim, Jung Tae Park, Jong Hak Kim

Research output: Contribution to journalArticle

Abstract

We report the development and assessment of mixed-matrix membranes (MMMs) that showed simultaneous improvement in CO2 permeability and CO2/N2 selectivity based on precise interface and interaction control. Specifically, MMMs were prepared using solution-synthesized ZIF-8 nanoparticles dispersed in a rubbery amphiphilic copolymer matrix, namely, poly(styrene-b-butadiene-b-styrene)-g-poly(oxyethylene methacrylate) (SBS-g-POEM) synthesized by free-radical polymerization. Excellent interface contact and compatibility between the ZIF-8 nanoparticles and SBS-g-POEM matrix were confirmed. The results showed that the polymer matrix did not damage the nanostructure of the ZIF-8, and the POEM chains grafted from the SBS backbones enhanced the compatibility with the ZIF-8. While the MMM based on a neat SBS matrix showed a continuous decrease in selectivity, the MMM based on SBS-g-POEM achieved a simultaneous improvement in permeability (from 261.7 to 522.3 Barrer) and CO2/N2 selectivity (from 18.6 to 20.8), indicating the importance of the matrix in tuning the interface and interaction of MMMs. The obtained CO2/N2 separation performance is close to the upper bound and one of the highest values for ZIF-8-based MMMs. Furthermore, the MMMs exhibited good mechanical strength (8.5 MPa tensile stress and 940% strain) and excellent thermal stability at least up to 300 °C.

Original languageEnglish
Pages (from-to)175-186
Number of pages12
JournalChemical Engineering Research and Design
Volume153
DOIs
Publication statusPublished - 2020 Jan

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Styrene
Copolymers
Membranes
Methacrylates
Butadiene
Nanoparticles
Free radical polymerization
Polymer matrix
Tensile stress
Strength of materials
Nanostructures
Thermodynamic stability
Tuning
1,3-butadiene

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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title = "Mixed matrix membranes consisting of ZIF-8 in rubbery amphiphilic copolymer: Simultaneous improvement in permeability and selectivity",
abstract = "We report the development and assessment of mixed-matrix membranes (MMMs) that showed simultaneous improvement in CO2 permeability and CO2/N2 selectivity based on precise interface and interaction control. Specifically, MMMs were prepared using solution-synthesized ZIF-8 nanoparticles dispersed in a rubbery amphiphilic copolymer matrix, namely, poly(styrene-b-butadiene-b-styrene)-g-poly(oxyethylene methacrylate) (SBS-g-POEM) synthesized by free-radical polymerization. Excellent interface contact and compatibility between the ZIF-8 nanoparticles and SBS-g-POEM matrix were confirmed. The results showed that the polymer matrix did not damage the nanostructure of the ZIF-8, and the POEM chains grafted from the SBS backbones enhanced the compatibility with the ZIF-8. While the MMM based on a neat SBS matrix showed a continuous decrease in selectivity, the MMM based on SBS-g-POEM achieved a simultaneous improvement in permeability (from 261.7 to 522.3 Barrer) and CO2/N2 selectivity (from 18.6 to 20.8), indicating the importance of the matrix in tuning the interface and interaction of MMMs. The obtained CO2/N2 separation performance is close to the upper bound and one of the highest values for ZIF-8-based MMMs. Furthermore, the MMMs exhibited good mechanical strength (8.5 MPa tensile stress and 940{\%} strain) and excellent thermal stability at least up to 300 °C.",
author = "Kang, {Dong A.} and Kihoon Kim and Lim, {Jung Yup} and Park, {Jung Tae} and Kim, {Jong Hak}",
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Mixed matrix membranes consisting of ZIF-8 in rubbery amphiphilic copolymer : Simultaneous improvement in permeability and selectivity. / Kang, Dong A.; Kim, Kihoon; Lim, Jung Yup; Park, Jung Tae; Kim, Jong Hak.

In: Chemical Engineering Research and Design, Vol. 153, 01.2020, p. 175-186.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mixed matrix membranes consisting of ZIF-8 in rubbery amphiphilic copolymer

T2 - Simultaneous improvement in permeability and selectivity

AU - Kang, Dong A.

AU - Kim, Kihoon

AU - Lim, Jung Yup

AU - Park, Jung Tae

AU - Kim, Jong Hak

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AB - We report the development and assessment of mixed-matrix membranes (MMMs) that showed simultaneous improvement in CO2 permeability and CO2/N2 selectivity based on precise interface and interaction control. Specifically, MMMs were prepared using solution-synthesized ZIF-8 nanoparticles dispersed in a rubbery amphiphilic copolymer matrix, namely, poly(styrene-b-butadiene-b-styrene)-g-poly(oxyethylene methacrylate) (SBS-g-POEM) synthesized by free-radical polymerization. Excellent interface contact and compatibility between the ZIF-8 nanoparticles and SBS-g-POEM matrix were confirmed. The results showed that the polymer matrix did not damage the nanostructure of the ZIF-8, and the POEM chains grafted from the SBS backbones enhanced the compatibility with the ZIF-8. While the MMM based on a neat SBS matrix showed a continuous decrease in selectivity, the MMM based on SBS-g-POEM achieved a simultaneous improvement in permeability (from 261.7 to 522.3 Barrer) and CO2/N2 selectivity (from 18.6 to 20.8), indicating the importance of the matrix in tuning the interface and interaction of MMMs. The obtained CO2/N2 separation performance is close to the upper bound and one of the highest values for ZIF-8-based MMMs. Furthermore, the MMMs exhibited good mechanical strength (8.5 MPa tensile stress and 940% strain) and excellent thermal stability at least up to 300 °C.

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