Abstract
Abstractω‐Norbornenyl polystyrene (PS) macromonomers whose molar masses range from 2700 to 11000 g/mole have been polymerized under living conditions by ring‐opening metathesis, with a Schrock complex as initiator. The samples obtained have been characterized by a multiangle laser light scattering (MLLS) detector connected to the outlet of a size exclusion chromatography (SEC) instrument. The experimental values of the degree of polymerization (D̄Pn) lie in close agreement with the expected ones. The compactness of the various branched species formed, which covers a wide range of segment densities (ρS), is found to depend on two factors that are their degree of polymerization and the size of the initial macromonomer. The ratio (g) of the mean‐square radii gyration (<R2b) of polymacromonomers to those (<R21) of linear PS homologues of same molar mass was also determined. Plotting the variation of g vs. the D̄Pn's of polymacromonomers gives an idea of the conformation adopted by these branched structures.
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