Covers current developments in sedimentation and thermal field flow fractionation for particle size analysis, and characterization of polymer molecular-weight distribution. Presents fundamental studies on critical conditions in liquid chromatography, single-parameter approach to universal SEC calibration, and compositional characterization of polyolefin copolymers as a function of molecular weight and bunching. Provides a strategy for interpreting multidetector size exclusion chromatography (SEC) data. Reviews SEC for cationic, anionic, and nonionic copolymers of vinylpyrrolidone. Presents applications of SEC for the characterization of natural polymer products, cotton, and polysaccharides.