Natura/ and synthetic poly(cis-1,4-isoprene) were characterized by size exclusion chromatography coupled with an online multiangle light scattering detector (SEC-MALS) (Fig. 1). Different from SEC classic method, the absolute molar masses are directly determined according to the variation of scattered light intensities with detecting angles and by using Zimm plot method for zero-angle extrapolation. This technique allows us to obtain elution profiles of rubber samples. (Texte intégral)