Functional oligo(vinyl acetate) bearing bipyridine moieties by RAFT polymerization and extraction of metal ions in supercritical carbon dioxide

Zhang, Shoucun; Luo, Yi; Yang, Hong-wei; Yang, Hanxi; Tan, Bien

doi:10.1039/c3py00212h

Cited by 20 publications

(16 citation statements)

References 45 publications

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“…And New vinyl ester copolymers poly (vinyl butyrate) (PVBu) and poly (vinyl octanoate) (PVOc) had been designed for use as stabilizers for dispersion polymerization in scCO 2 [28]. Tan et al synthesized the oligomer vinyl acetate with different topologies and functional oligo(vinyl acetate) bearing bipyridine moieties by RAFT/MADIX method [29,30]. Johnston et al developed the nonionic hydrocarbon surfactants and investigated the morphology and stability of CO 2 -inwater foams [31].…”

Section: Introductionmentioning

confidence: 99%

Surfactant-free CO2-in-water emulsion-templated poly (vinyl alcohol) (PVA) hydrogels

Luo

Zhang

Peng

et al. 2015

Polymer

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Section: Introductionmentioning

confidence: 99%

Surfactant-free CO2-in-water emulsion-templated poly (vinyl alcohol) (PVA) hydrogels

Luo

Zhang

Peng

et al. 2015

Polymer

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“…with good control of both molar masses and chain end fidelity, as revealed by MALDI-TOF spectrometry. In order to apply PVAc in extraction of metal ions in scCO 2 , Zhang et al [123] developed a bipyridine bis(xanthate) (X-bpy-X, Scheme 8) allowing the controlled polymerization of VAc. In this case, two polymer chains grow from the functional bis(xanthate), putting the bipyridine in the middle of the PVAc.…”

Section: Methodsmentioning

confidence: 99%

“…In between these extremes, a wide range of R-groups may be employed to good effect, including esters of 1-acetyl [86][87][88][89][90]108,[110][111][112][113], 2-propionyl [3][4][5][6][7][8][9]30,31,34,66,69,70,[80][81][82]85,89,91,107,[114][115][116][117][118][119][120][121][122][123] and 2-methyl-2-propionyl [67,91], 2-acetic acid [124], 2-propionic acid [106,114,125], t-butyl [106], cyanomethyl [67,102], benzyl …”

Section: Methodsmentioning

confidence: 99%

“…Some highly CO 2 -philic fluorinated or siloxane-based ligands are in removing various metals from solid and liquid matrices [176][177][178][179]. Zhang et al [123] have developed an extraction method using RAFT polymerization in order to functionalize a bipyridine group with VAc oligomers. Their results show that the solubility of the functional polymer was lower than that of unfunctionalized PVAc of similar molecular weight, and decreased with increasing molecular weight.…”

Section: Co 2 -Philic Polymers and Surfactantsmentioning

confidence: 99%

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RAFT Polymerization of Vinyl Esters: Synthesis and Applications

et al. 2014

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This article is the first comprehensive review on the study and use of vinyl ester monomers in reversible addition fragmentation chain transfer (RAFT) polymerization. It covers all the synthetic aspects associated with the definition of precision polymers comprising poly(vinyl ester) building blocks, such as the choice of RAFT agent and reaction conditions in order to progress from simple to complex macromolecular architectures. Although vinyl acetate was by far the most studied monomer of the range, many vinyl esters have been considered in order to tune various polymer properties, in particular, solubility in supercritical carbon dioxide (scCO 2 ). A special emphasis is given to novel poly(vinyl alkylate)s with enhanced solubilities in scCO 2 , with applications as reactive stabilizers for dispersion polymerization and macromolecular surfactants for CO 2 media. Other miscellaneous uses of poly(vinyl ester)s synthesized by RAFT, for instance as a means to produce poly(vinyl alcohol) with controlled characteristics for use in the biomedical area, are also covered.

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“…The heating rate and cooling rate are 5 °C/min. Take the average of three measurements as the result [ 28 , 29 , 30 ].…”

Section: Methodsmentioning

confidence: 99%

Preparation and Performance of Supercritical Carbon Dioxide Thickener

Liu¹,

Wang²,

Lei³

2020

Polymers

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The low sand-carrying problem caused by the low viscosity of supercritical carbon dioxide (SC–CO2) limits the development of supercritical CO2 fracturing technology. In this study, a molecular simulation method was used to design a fluorine-free solvent-free SC–CO2 thickener 1,3,5,7-tetramethylcyclotetrasiloxane (HBD). Simulations and experiments mutually confirm that HBD-1 and HBD-2 have excellent solubility in SC–CO2. The apparent viscosity of SC–CO2 after thickening was evaluated with a self-designed and assembled capillary viscometer. The results show that when the concentration of HBD-2 is 5 wt.% (305.15 K, 10 MPa), the viscosity of SC–CO2 increases to 4.48 mPa·s. Combined with the capillary viscometer and core displacement device, the low damage of SC–CO2 fracturing fluid to the formation was studied. This work solves the pollution problems of fluoropolymers and co-solvents to organisms and the environment and provides new ideas for the molecular design and research of SC–CO2 thickeners.

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Functional oligo(vinyl acetate) bearing bipyridine moieties by RAFT polymerization and extraction of metal ions in supercritical carbon dioxide

Cited by 20 publications

References 45 publications

Surfactant-free CO2-in-water emulsion-templated poly (vinyl alcohol) (PVA) hydrogels

Surfactant-free CO2-in-water emulsion-templated poly (vinyl alcohol) (PVA) hydrogels

RAFT Polymerization of Vinyl Esters: Synthesis and Applications

Preparation and Performance of Supercritical Carbon Dioxide Thickener

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