| 초록 |
SEC coupled with viscometer and light scattering detector has been used to estimate the number of branching. It utilizes the fact that branching reduces the hydrodynamic size of polymer chains under the assumption that individual SEC fraction is homogeneous. However, the SEC separates the polymers according to the chain size and is not able to fractionate the polymers with complex chain architecture into homogeneous fractions. On the other hand, interaction chromatography can separate branched polymers with far better sensitivity to molecular weight than SEC. In this work, we attempted to characterize star-shaped polymers by using 2D-LC. TGIC separates polymers according to molecular weight. The TGIC fractions were subjected to SEC separation according to the chain size and SEC effluents were analyzed by multiple detection to determine the branching parameter. The comparison of the molecular weight dependent branching parameters determined by the two methods will be presented. |
