HPLC-1H-NMR Characterization of Polystyrene- block-Polyisoprene Copolymers: LCCC-1H-NMR Using a Single Mobile Phase.

The analysis of PS- b-PI copolymers, synthesized by sequential living anionic polymerization was conducted by on-line hyphenation of liquid chromatography at critical conditions (LCCC) and proton nuclear magnetic resonance spectroscopy (1H-NMR). Critical conditions were established for polyisoprene using 1,4-dioxane as the mobile phase and varying the column oven temperature. At these critical conditions, the polyisoprene homopolymer formed during synthesis was separated from the copolymer. The molar mass of the PS block, the chemical composition of the block copolymers as well as the microstructure of PI were determined in a single experiment. [ABSTRACT FROM AUTHOR]