| 초록 |
The precise characterization of a copolymer having both molecular weight distribution and chemical composition distribution is much more complicated than the analysis of a homopolymer. The ultimate goal is to construct a two-dimensional, one in molecular weight and the other in chemical composition, distribution map. An attractive method for the purpose is the two-dimensional liquid chromatography (2D-LC), in which two different chromatographic separation method are used in sequence. In this study, 2D-LC method was employed in order to map the diblock copolymers well defined in molecular weight as well as in composition. We employed 2D-LC method ; normal phase liquid chromatography (NPLC) for one dimension and reversed phase liquid chromatography (RPLC) dimension for the other dimension. Especially, fractions from NPLC are transferred to RPLC using the full adsorption-desorption technique, by which they are concentrated before injection into the second dimension. |
