Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1999-11-29
Physics
Condensed Matter
Statistical Mechanics
33 pages, 11 figues, J.Chem. Phys. accepted Oct. 1999
Scientific paper
10.1063/1.480600
Polydisperse brushes obtained by reversible radical chain polymerization reaction onto a solid substrate with surface-attached initiators, are studied by means of an off-lattice Monte Carlo algorithm of living polymers (LP). Various properties of such brushes, like the average chain length and the conformational orientation of the polymers, or the force exerted by the brush on the opposite container wall, reveal power-law dependence on the relevant parameters. The observed molecular weight distribution (MWD) of the grafted LP decays much more slowly than the corresponding LP bulk system due to the gradient of the monomer density within the dense pseudo-brush which favors longer chains. Both MWD and the density profiles of grafted polymers and chain ends are well fitted by effective power laws whereby the different exponents turn out to be mutually self-consistent for a pseudo-brush in the strong-stretching regime.
Landau David. P.
Milchev Andrey
Wittmer Joachim P.
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