Copolymerization of carbon dioxide and propylene oxide with highly effective zinc hexacyanocobaltate(III)-based coordination catalyst

Chen, Shang; Zheng-jiang, Hua; Fang, Zhuo; Qi, Guilin

doi:10.1016/j.polymer.2004.07.044

Cited by 119 publications

(68 citation statements)

References 29 publications

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“…[22][23][24][25][26] Recent studies have focused on how to improve the efficiency of the copolymerization and to enhance the catalytic activity of these complexes. [22,24,25,[27][28][29][30] In this paper, we describe the electrochemical properties of several structurally related cobalt complexes and the X-ray crystal structure, which provided an important insight into the copolymerization mechanism of CO 2 and propylene oxide catalyzed by these complexes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Zhuang

Oyaizu

Niu

et al. 2010

Macro Chemistry & Physics

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A series of cobalt complexes with N,N,O,O‐tetradentate Schiff base ligands were prepared. All the complexes were characterized by spectroscopy and electrochemical methods. An X‐ray crystal structure analysis revealed that L1‐CoIII‐dnp was monomeric with a six‐coordinated central cobalt(III) atom in the solid state. The complexes were employed as catalysts for the alternating copolymerization of CO2 and racemic propylene oxide. End group analysis of the resulting polymer provided strong evidence for a monomer insertion mechanism for the propagation step. The catalytic activity was interpreted using the redox potential of cobalt(II/III) for the L‐CoIII‐dnp complexes, which offered a measure of the bond strength, or the degree of inertness of the axial ligand, to promote or suppress the monomer insertion.magnified image

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Section: Introductionmentioning

confidence: 99%

Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Zhuang

Oyaizu

Niu

et al. 2010

Macro Chemistry & Physics

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“…The signal at δ =0.1 (a) and δ =3.6 (b) ppm is attributed to the protons of Si-CH 3 bond and O-CH 2 -CH 2 bond, respectively. The signals at δ =3.3 (c), δ =1.1 (d) and δ =3.5 (e) ppm are ascribed to the protons of O-CH(CH 3 )-CH 2 bond orderly [32][33][34]. The silicone/polyether ratio of each silicone surfactant can be obtained by estimating area of each signal which indicates the number of protons exists.…”

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confidence: 99%

Effects of silicone surfactant on the cell size and thermal conductivity of rigid polyurethane foams by environmentally friendly blowing agents

Han¹,

Choi²,

Kim³

et al. 2009

Macromol. Res.

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Rigid polyurethane foams (PUF)s were synthesized with environmentally friendly blowing agents such as a cyclopentane/distilled water (10.0/1.0, pphp) mixture and distilled water only for four different silicone surfactants having different silicone/polyether ratios. An attempt was made to reduce the thermal conductivities of the PUF samples by varying the concentration and the silicone/polyether ratio of the various silicone surfactants. The scanning electron microscopy (SEM) results indicated an optimum concentration of the silicone surfactant of about 1.5 to 2.5 phpp for various surfactants to reduce the cell size and lower the thermal conductivity. The silicone surfactant having a higher silicone/polymer ratio showed a smaller cell size and, therefore, demonstrated the lower thermal conductivity of the PUF samples. From the relation between the thermal conductivity and the cell size of the PUF samples, the smaller cell size improved the thermal insulation property of the rigid PUF for both the PUF samples blown by the cyclopentane/distilled water (10.0/1.0, pphp) mixture and distilled water only. If the blowing agent is fixed, then the cell size is an important factor to decrease the thermal conductivity of the PUF samples. These results indicated that rigid PUF samples having lower thermal conductivity can be obtained by choosing a silicone surfactant containing a higher silicone/polyether ratio, as well as an optimum content of the surfactant.

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“…Typical values for carbonate linkages in PPC are in the range of 20-40%, whilst those for PCHC can reach 90% [22,118,126]. Moreover, the copolymerisation conditions require high pressures of CO 2 (50-100 atm) [21,22,118,126]. Finally, the copolymer molecular weights were moderate (10,000-30,000 g/mol), with large dispersities as would be expected from multisite initiators.…”

Section: Early Discoveries and Heterogeneous Systemsmentioning

confidence: 99%

“…The drawback of these heterogeneous catalysts is their lower reactivity towards CO 2 [24]. Typical values for carbonate linkages in PPC are in the range of 20-40%, whilst those for PCHC can reach 90% [22,118,126]. Moreover, the copolymerisation conditions require high pressures of CO 2 (50-100 atm) [21,22,118,126].…”

Section: Early Discoveries and Heterogeneous Systemsmentioning

confidence: 99%

Dinuclear Metal Complex-Mediated Formation of CO2-Based Polycarbonates

Romain

Thevenon

Saini

et al. 2015

Topics in Organometallic Chemistry

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This review describes selected metal catalysts for the copolymerisation of epoxides and carbon dioxide to produce polycarbonates. It highlights kinetic and mechanistic studies which have implicated di-or (multi-) metallic pathways for this catalysis and the subsequent development of highly active and selective di-/(multi-) nuclear catalysts. The emphasis is on homogeneous di-/bimetallic catalysts.

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Copolymerization of carbon dioxide and propylene oxide with highly effective zinc hexacyanocobaltate(III)-based coordination catalyst

Cited by 119 publications

References 29 publications

Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Synthesis and Electrochemistry of Schiff Base Cobalt(III) Complexes and Their Catalytic Activity for Copolymerization of Epoxide and Carbon Dioxide

Effects of silicone surfactant on the cell size and thermal conductivity of rigid polyurethane foams by environmentally friendly blowing agents

Dinuclear Metal Complex-Mediated Formation of CO2-Based Polycarbonates

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