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Statements

Subject Item
dbr:Mayo–Lewis_equation
rdf:type
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rdfs:label
Mayo–Lewis equation Équation de Mayo-Lewis
rdfs:comment
L'équation de Mayo-Lewis concerne l'obtention de copolymères diblocs par polyaddition. Elle permet de relier la composition instantanée du copolymère (pourcentage d'unités A et B) à la composition du mélange de monomères (pourcentage de monomères A et B). Elle donne également une idée de la structure du copolymère : statistique, à bloc, alterné… L'équation est la suivante : Les concentrations en monomères sont données entre crochets. Les et sont les rapports de réactivité, caractéristiques d'un couple de monomères à une température donnée. The Mayo–Lewis equation or copolymer equation in polymer chemistry describes the distribution of monomers in a copolymer. It was proposed by Frank R. Mayo and . The equation considers a monomer mix of two components and and the four different reactions that can take place at the reactive chain end terminating in either monomer ( and ) with their reaction rate constants : The reactivity ratio for each propagating chain end is defined as the ratio of the rate constant for addition of a monomer of the species already at the chain end to the rate constant for addition of the other monomer.
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dbr:Styrene dbr:Rate_constant dbr:Block_copolymer dbr:Reaction_rate_constant dbr:Steady_state_(chemistry) dbc:Polymer_chemistry dbr:Homopolymer dbr:Frederick_M._Lewis dbc:Equations dbr:Maleic_anhydride dbr:Fourier_transform_infrared_spectroscopy dbr:Composition_drift dbr:Frank_R._Mayo dbr:Carbon-13_nuclear_magnetic_resonance dbr:Concentration dbr:Monomer dbr:Reaction_rate dbr:Copolymer dbr:Nonlinear_least_squares dbr:Mole_fraction dbr:Proton_nuclear_magnetic_resonance dbr:Special_case dbr:Polymer_chemistry dbr:Alternating_polymer
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dbo:abstract
The Mayo–Lewis equation or copolymer equation in polymer chemistry describes the distribution of monomers in a copolymer. It was proposed by Frank R. Mayo and . The equation considers a monomer mix of two components and and the four different reactions that can take place at the reactive chain end terminating in either monomer ( and ) with their reaction rate constants : The reactivity ratio for each propagating chain end is defined as the ratio of the rate constant for addition of a monomer of the species already at the chain end to the rate constant for addition of the other monomer. The copolymer equation is then: with the concentrations of the components in square brackets. The equation gives the relative instantaneous rates of incorporation of the two monomers. L'équation de Mayo-Lewis concerne l'obtention de copolymères diblocs par polyaddition. Elle permet de relier la composition instantanée du copolymère (pourcentage d'unités A et B) à la composition du mélange de monomères (pourcentage de monomères A et B). Elle donne également une idée de la structure du copolymère : statistique, à bloc, alterné… L'équation est la suivante : Les concentrations en monomères sont données entre crochets. Les et sont les rapports de réactivité, caractéristiques d'un couple de monomères à une température donnée.
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wikipedia-en:Mayo–Lewis_equation?oldid=1118575294&ns=0
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wikipedia-en:Mayo–Lewis_equation