Abstract

Complex polymers are distributed in more than one direction of molecular heterogeneity. In addition to the molar mass distribution, they are frequently distributed with respect to chemical composition, functionality, and molecular architecture. For the characterization of the different types of molecular heterogeneity it is necessary to use a wide range of analytical techniques. Preferably, these techniques should be selective towards a specific type of heterogeneity. The combination of two selective analytical techniques is assumed to yield two-dimensional information on the molecular heterogeneity. The present review presents the principal ideas of combining different chromatographic techniques in two-dimensional analysis schemes. Most promising protocols for 2D-LC refer to the combination of interactive chromatographic methods in the first dimension and size exclusion chromatography in the second dimension. The detailed analysis of functional homopolymers, segmented copolymers, and complex polymer blends will be discussed.

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