DETERMINATION OF CHEMICAL COMPOSITION DISTRIBUTION OF POLY(METHYL METHACRYLATE)-GRAFT-POLYSTYRENE PREPARED FROM OMEGA-P-VINYLBENZYL POLYSTYRENE MACROMONOMER BY ADSORPTION HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY

摘要

Chemical composition distributions (CCDs) of poly(methyl methacrylate)-graft-polystyrene samples with different compositions and conversions synthesized from methyl methacrylate and omega-p-vinylbenzyl polystyrene macromonomer were determined by high-performance liquid chromatography using both reversed-phase and normal-phase adsorption modes. The good agreement between CCDs obtained by both modes showed that the molecular-weight effect on the CCDs is negligible. All samples have broad CCDs. As the macromonomer content increases, the CCD becomes sharper. These results are in accordance with the theoretical predictions. As the conversion increases at the same feed composition, the CCD becomes broader towards the low-macromonomer-content side, which is in contrast to the CCDs of the samples obtained previously from omega-methacryloyl polystyrene macromonomer. [References: 14]