LrgpV1, Main, Exploration, bibRecord, 001A47

Solvent effects on tempo-mediated radical polymerizations: behaviour of 3-vinylpyridine in a protic solvent

Identifieur interne : 001A47 ( Main/Exploration ); précédent : 001A46; suivant : 001A48

Solvent effects on tempo-mediated radical polymerizations: behaviour of 3-vinylpyridine in a protic solvent

Auteurs : XING ZHE DING [France] ; Arnaud Fischer [France] ; SHUOWANG YANG [Singapour] ; PING WU [Singapour] ; Alain Brembilla [France] ; Pierre Lochon [France]

Source :

European polymer journal [ 0014-3057 ] ; 2001.

RBID : Pascal:01-0319232

Descripteurs français

Pascal (Inist)
- Pyridine(vinyl) polymère, Polymère vivant, Polymérisation radicalaire, Polymérisation solution, Solvant protique, Pyridine, Ethane-1,2-diol, Pipéridine dérivé, Nitroxyle, Cinétique, Effet solvant, Mécanisme action, Liaison hydrogène, Etude expérimentale, Interaction soluté solvant, Pyridine(3-vinyl) polymère.

English descriptors

KwdEn :
- Ethylene glycol, Experimental study, Free radical polymerization, Hydrogen bond, Kinetics, Living polymer, Mechanism of action, Nitroxyl, Piperidine derivatives, Protic solvent, Pyridine, Pyridine(vinyl) polymer, Solution polymerization, Solvent effect.

Abstract

Solvents can strongly influence the equilibrium between dormant and active species which is involved in 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated radical polymerizations. At 110°C, the overall polymerization rate of 3-vinylpyridine in pyridine was logically found lower than that in bulk, due to dilution. However, in ethylene-glycol, the opposite behaviour was observed. According to infrared spectroscopy, this unexpected increase in the overall polymerization rate was attributed to hydrogen bonding between ethylene-glycol and the pyridine rings, which weakens the C-O-N bond of the TEMPO-terminated polymers. Semi-empirical molecular orbital calculations were used to support the FTIR results and to calculate the decrease in the dissociation enthalpy of the polymer-nitroxide bond.

Affiliations:

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Le document en format XML

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<term>Pipéridine dérivé</term>
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<term>Mécanisme action</term>
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<front><div type="abstract" xml:lang="en">Solvents can strongly influence the equilibrium between dormant and active species which is involved in 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated radical polymerizations. At 110°C, the overall polymerization rate of 3-vinylpyridine in pyridine was logically found lower than that in bulk, due to dilution. However, in ethylene-glycol, the opposite behaviour was observed. According to infrared spectroscopy, this unexpected increase in the overall polymerization rate was attributed to hydrogen bonding between ethylene-glycol and the pyridine rings, which weakens the C-O-N bond of the TEMPO-terminated polymers. Semi-empirical molecular orbital calculations were used to support the FTIR results and to calculate the decrease in the dissociation enthalpy of the polymer-nitroxide bond.</div>
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Solvent effects on tempo-mediated radical polymerizations: behaviour of 3-vinylpyridine in a protic solvent

Solvent effects on tempo-mediated radical polymerizations: behaviour of 3-vinylpyridine in a protic solvent

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri