Kinetic Analysis of "Living" Polymerization Processes Exhibiting Slow Equilibria. 1. Degenerative Transfer (Direct Activity Exchange between Active and "Dormant" Species). Application to Group Transfer Polymerization

Mueller, Axel; Zhuang, Rugang; Yan, Deyue; Литвиненко, Г. И.

doi:10.1021/ma00116a040

Cited by 210 publications

(236 citation statements)

References 6 publications

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“…The PDIs decrease with MW, which can be the result of reduced chain transfer for longer chains 20 or a consequence of the equilibrium between active and "dormant" species. 21 The particularly high PDI of the smallest oligomer (MS 72), close to 2, reminiscent of free-radical polymerization, can be attributed to the inherent trend of GTP for termination by cyclization at degrees of polymerization in the vicinity of 3.…”

Section: Characterization In Watermentioning

confidence: 99%

Near-monodisperse, catalytically active, imidazole-containing homooligomers: Synthesis by group transfer polymerization and solution characterization

Simmons

Patrickios

1999

J. Polym. Sci. A Polym. Chem.

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Section: Characterization In Watermentioning

confidence: 99%

Near-monodisperse, catalytically active, imidazole-containing homooligomers: Synthesis by group transfer polymerization and solution characterization

Simmons

Patrickios

1999

J. Polym. Sci. A Polym. Chem.

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“…The theoretical molecular weight, M n,th , [21] . Among them, C tr is related to the intrinsic property of the chain-transfer agents [22].…”

Section: Factors That Govern Polymer Molecular Weight and Its Distribmentioning

confidence: 99%

Synthesis and characterization of high molecular weight and low dispersity polystyrene homopolymers by RAFT polymerization

Cheng

Liu

2012

E-Polymers

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High molecular weight polystyrene homopolymers with low dispersity were synthesized by a reversible addition-fragmentation chain transfer (RAFT) polymerization method using 0.03 and 0.3 wt% of cumyl dithiobenzoate (CDB) vs. styrene (St) and the azobis(isobutyronitrile) initiator, at the polymerization temperature of 60 or 70 °C. The optimal high molecular weight polystyrene via this synthetic scheme shows M w = 46.5×10 , and a dispersity of 1.40. The polystyrene chain contains a dithiobenzoate C=S moiety and thus can be used as a macro-chain-transfer agent for the polymerization of other monomers and for the synthesis of diversified block copolymers under mild conditions. The changes of the polystyrene molecular weight and dispersity were studied by the influences of the initial concentration ratio of CDB to styrene ([CDB] 0 /[St] 0 ), the polymerization temperature, and the polymerization time. The PS molecular weight is inversely proportional to the [CDB] 0 /[St] 0 ratio. Decreasing CDB from 0.3 to 0.03 wt%, a high MW PS was obtained, while the dispersity was observed to increase from 1.10 to 1.40. The PS molecular weight increases with the increase of the reaction time, while the dispersity of PS varies little from 1.12 to 1.23. The molecular weight and dispersity increase with the increase of the polymerization temperature. As the temperature arises from 60°C to 70°C, the conversion increases considerably from 25.8% to 39.9%, and the dispersity increases slightly from 1.15 to 1.17. As the temperature reaches 80°C, the conversion increases considerably to 64.7%, and the dispersity increases to 1.53. The polymer molecular weight of the polystyrene prepared by the RAFT method is suitable for the applications of engineering materials.

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“…This trend may be the result of reduced chain transfer for longer chains 17 or a consequence of the equilibrium between active and "dormant" species. 18 The values of PDIs lie between 1.34 and 1.09. Figure 4(b) represents the results for the polyHEMAs.…”

Section: Characterization In Organic Solventsmentioning

confidence: 99%

Synthesis and characterization of near-monodisperse electron acceptor homopolymers of 2-[(3,5-dinitrobenzoyl)oxy]ethyl methacrylate

Orphanou

Simmons

Patrickios

2000

J. Polym. Sci. A Polym. Chem.

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Kinetic Analysis of "Living" Polymerization Processes Exhibiting Slow Equilibria. 1. Degenerative Transfer (Direct Activity Exchange between Active and "Dormant" Species). Application to Group Transfer Polymerization

Cited by 210 publications

References 6 publications

Near-monodisperse, catalytically active, imidazole-containing homooligomers: Synthesis by group transfer polymerization and solution characterization

Near-monodisperse, catalytically active, imidazole-containing homooligomers: Synthesis by group transfer polymerization and solution characterization

Synthesis and characterization of high molecular weight and low dispersity polystyrene homopolymers by RAFT polymerization

Synthesis and characterization of near-monodisperse electron acceptor homopolymers of 2-[(3,5-dinitrobenzoyl)oxy]ethyl methacrylate

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