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Highly efficient CO2 and propylene oxide co-polymerization using Zn glutarate/Zn-Cr double metal cyanide composite catalyst

Mbabazi, Ruth LU ; Nyanzi, Steven Allan ; Naziriwo, Betty ; Ojwach, Stephen O. ; Folkers, Laura C. LU ; Wendt, Ola F. LU and Tebandeke, Emmanuel LU (2024) In Sustainable Chemistry for Climate Action 4.
Abstract

A highly active zinc glutarate-double metal cyanide (DMC) composite catalyst (ZnGA/Zn-CrDMC) was designed for the carbon dioxide (CO2) and propylene oxide (PO) copolymerization reaction. The composite catalyst was synthesized in a rheological phase reaction and characterized using Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM). The synthesized composite catalysed the solvent free reactions of PO and CO2 to afford biodegradable polypropylene carbonate (PPC) copolymer. 1H NMR,13C NMR, FT-IR and ESI-TOF mass spectrometry measurements were employed to confirm the characteristics of the PPC produced. Under optimal reaction... (More)

A highly active zinc glutarate-double metal cyanide (DMC) composite catalyst (ZnGA/Zn-CrDMC) was designed for the carbon dioxide (CO2) and propylene oxide (PO) copolymerization reaction. The composite catalyst was synthesized in a rheological phase reaction and characterized using Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM). The synthesized composite catalysed the solvent free reactions of PO and CO2 to afford biodegradable polypropylene carbonate (PPC) copolymer. 1H NMR,13C NMR, FT-IR and ESI-TOF mass spectrometry measurements were employed to confirm the characteristics of the PPC produced. Under optimal reaction conditions (50 bar CO2, 70 °C, 24 h), the ZnGA-Zn3[Cr(CN)6]2 composite displayed higher catalytic activities in the copolymerization reactions than the individual catalysts. The ZnGA:Zn3[Cr(CN)6]2 ratio of 15:1 gave PPC yield of 47.9 g polymer/g cat compared to ZnGA that produced 42.6 g polymer/ g cat in 24 h. In addition, the PPC produced from the composite catalyst displayed higher carbonate linkage content (Fc = 85.4 %) compared to the value of Fc = 33.9 %. obtained using the Zn3[Cr(CN)6]2 catalyst. Similaly, the composite catalsyt produced PPC with molecular weight of 4200 g/mol and narrow polydispersity index of 2.2. The resultant PPC copolymer displayed good thermal stability, exhibiting a high degradation temperatures (TGA-10%) of 229 °C and complete decomposition at 350 °C.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Polypropylene carbonate, Zinc glutarate, double metal cyanide, composite catalyst, carbon dioxide
in
Sustainable Chemistry for Climate Action
volume
4
article number
100037
publisher
Elsevier
external identifiers
  • scopus:85180965096
ISSN
2772-8269
DOI
10.1016/j.scca.2023.100037
language
English
LU publication?
yes
id
56c0140a-3c40-48cb-ac76-592ca85895b2
date added to LUP
2024-02-12 11:29:22
date last changed
2024-02-12 16:07:10
@article{56c0140a-3c40-48cb-ac76-592ca85895b2,
  abstract     = {{<p>A highly active zinc glutarate-double metal cyanide (DMC) composite catalyst (ZnGA/Zn-CrDMC) was designed for the carbon dioxide (CO<sub>2</sub>) and propylene oxide (PO) copolymerization reaction. The composite catalyst was synthesized in a rheological phase reaction and characterized using Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (PXRD), and scanning electron microscopy (SEM). The synthesized composite catalysed the solvent free reactions of PO and CO<sub>2</sub> to afford biodegradable polypropylene carbonate (PPC) copolymer. <sup>1</sup>H NMR,<sup>13</sup>C NMR, FT-IR and ESI-TOF mass spectrometry measurements were employed to confirm the characteristics of the PPC produced. Under optimal reaction conditions (50 bar CO<sub>2</sub>, 70 °C, 24 h), the ZnGA-Zn<sub>3</sub>[Cr(CN)<sub>6</sub>]<sub>2</sub> composite displayed higher catalytic activities in the copolymerization reactions than the individual catalysts. The ZnGA:Zn<sub>3</sub>[Cr(CN)<sub>6</sub>]<sub>2</sub> ratio of 15:1 gave PPC yield of 47.9 g polymer/g cat compared to ZnGA that produced 42.6 g polymer/ g cat in 24 h. In addition, the PPC produced from the composite catalyst displayed higher carbonate linkage content (Fc = 85.4 %) compared to the value of Fc = 33.9 %. obtained using the Zn<sub>3</sub>[Cr(CN)<sub>6</sub>]<sub>2</sub> catalyst. Similaly, the composite catalsyt produced PPC with molecular weight of 4200 g/mol and narrow polydispersity index of 2.2. The resultant PPC copolymer displayed good thermal stability, exhibiting a high degradation temperatures (TGA<sub>-10%</sub>) of 229 °C and complete decomposition at 350 °C.</p>}},
  author       = {{Mbabazi, Ruth and Nyanzi, Steven Allan and Naziriwo, Betty and Ojwach, Stephen O. and Folkers, Laura C. and Wendt, Ola F. and Tebandeke, Emmanuel}},
  issn         = {{2772-8269}},
  keywords     = {{Polypropylene carbonate; Zinc glutarate, double metal cyanide, composite catalyst, carbon dioxide}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Sustainable Chemistry for Climate Action}},
  title        = {{Highly efficient CO<sub>2</sub> and propylene oxide co-polymerization using Zn glutarate/Zn-Cr double metal cyanide composite catalyst}},
  url          = {{http://dx.doi.org/10.1016/j.scca.2023.100037}},
  doi          = {{10.1016/j.scca.2023.100037}},
  volume       = {{4}},
  year         = {{2024}},
}