Greffage Anionique de Polyisoprene par Desactivation sur les noirs de Carbone Porteurs de Groupes Esters. Taux Limite de Greffage |
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Authors: | Par Eugne Papirer Jean-Baptiste Donnet Gerard Riess Van Tao Nguyen |
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Affiliation: | Par Eugène Papirer,Jean-Baptiste Donnet,Gerard Riess,Van Tao Nguyen |
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Abstract: | Anionic grafting of polyisoprene and polystyrene by desactivation of a living polymer on the ester groups previosly introduced on the carbon black surface has been followed as a function of the molecular weight of the polymer. The desactivation reaction is limited. A correclation between the grafting ratios and the molecular weights exists. If we assume the macromolecule to behave like spheres having a radius identical to the gyration radius calculated from the viscosity measurement, we will be able to determine the surface coverage of the solid sample. A constant value equal to 1,5 is thus obtained for all the polymers having molecular weights ranging from 4 000 to 135 000. A surface coverage of 1 would correspond to ellipsoids showing axes ratios in close agreement with those calculated statistically by KUHN . |
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