Observation of magnetic field effect on polymer yield in photoinduced dispersion polymerization of styrene

Ushakova, M.A.; Chernyshev, Andrei V.; Taraban, M.B.; Petrov, A. K.

doi:10.1016/s0014-3057(03)00177-0

Cited by 17 publications

(14 citation statements)

References 26 publications

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“…Magnetic field effects on the reaction outcome are already known for dozens of photochemical processes. Model systems include electron transfer between pyrene and dimethylaniline [78] and in photolysis of benzophenone [79] and dibenzyl ketone [80,81]. MFE on polymerization have been observed in systems where the initiator goes through a bi-radical [82,83].…”

Section: Nanomagnetic Catalysismentioning

confidence: 99%

Spectroscopy in sculpted fields

2009

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Section: Nanomagnetic Catalysismentioning

confidence: 99%

Spectroscopy in sculpted fields

2009

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“…Frequently used vectors to prepare MMP can be divided according to their chemical structure into polymers [12], biomolecules [13] and inorganic materials [14]. Different strategies have been described to prepare magnetic polymer-based spherical particles such as monomer polymerization method-emulsion polymerization [15], suspension polymerization [16], dispersion polymerization [17], microemulsion polymerization [18], solvent diffusion [19] and solvent evaporation [20].…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and surface study of poly-epsilon caprolactone magnetic microparticles

Hamoudeh

Fessi

2006

Journal of Colloid and Interface Science

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“…Magnetochemistry was put forward in the 1960s and the influence of externally applied magnetic field (EAMF) on radical polymerization process and polymer has been well studied, including initiation, monomers, processes, and reaction conditions of radical polymerization under EAMF, as well as magnetic field influence on polymer properties . EAMF has an obvious effect on the rate of chemical reactions between a pair radicals with different g values, such as cross‐termination in bulk RAFTP of St .…”

Section: Introductionmentioning

confidence: 99%

Quantitatively Probing Cross‐Termination in RAFT Polymerization by an Externally Applied Magnetic Field

Zhou

Zou

et al. 2015

Macro Chemistry & Physics

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Cross-termination in bulk reversible addition-fragmentation chain transfer (RAFT) polymerization is characterized by defi ning a new parameter, R M , in terms of the polymerization rates with and without an externally applied magnetic fi eld (EAMF). For the bulk RAFT polymerization (RAFTP) of styrene (St), mediated by (2-cyano-2-propyl)dithiobenzoate (CPDB) and S-1-dodecyl-S′-(α, α′-dimethyl-α′′-acetic acid)trithiocarbonate (DDMAT), an R M of 0.534 and 0.382 is obtained respectively, showing a sensible dependence on the RAFT agent. It is also found that R M has a close relationship with the strength of the EAMF and the concentration of the RAFT agent. Detailed discussion reveals that R M can be used as a characteristic para meter to measure the extent of cross-termination in RAFTP. The experimental technique offers an effi cient way to quantita tively probe the cross-termination in situ, and sheds light on the mechanism of RAFTP. spectroscopy, [3][4][5] NMR, [ 6,7 ] size-exclusion chromatographyelectrospray ionization-mass spectrometry (SECESI-MS), [ 8 ] size-exclusion chromatography (SEC), and matrix-assisted laser desorption ionization-time-of-fl ight mass spectrometry (MALDI-TOF-MS), [ 9 ] identifi cation of termination products, [ 10,11 ] etc. According to the mechanism as shown in Scheme 1 , the number of propagating radicals as well as polymerization rate should not be affected by RAFT agent, while rate retardation effect during dithiobenzoate-mediated RAFTP process came into notice [ 12 ] and it has been found that the rate retardation is proportional to the concentration of RAFT agent. During exploration of rational explanations for the retardation, cross-termination between intermediate radicals and propagating radicals was found to be one of responsible factors, [13][14][15][16][17] resulting in a large proportion of propagating radicals turning into dead chains. The controversy about slow fragmentation and fast fragmentation (with cross-termination) lasts for years [18][19][20][21] and both of fast fragmentation and cross-termination of the RAFT intermediate radical have been observed in full agreement with the cross-termination model in many

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Observation of magnetic field effect on polymer yield in photoinduced dispersion polymerization of styrene

Cited by 17 publications

References 26 publications

Spectroscopy in sculpted fields

Spectroscopy in sculpted fields

Preparation, characterization and surface study of poly-epsilon caprolactone magnetic microparticles

Quantitatively Probing Cross‐Termination in RAFT Polymerization by an Externally Applied Magnetic Field

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