Preparation of uniform stereoregular polymer, stereoblock polymer and copolymer of methacrylate, and their stereocomplex formation

摘要

Isotactic (it-) and syndiotactic (st-) uniform poly(methyl methacrylate)s (PMMAs) were prepared by stereospecific living polymerizations followed by supercritical fluid chromatographic separation. The it- and st-uniform PMMAs were used to study the mechanism of stereocomplex formation in solution with the aid of gel permeation chromatography and H-1 NMR spectroscopy. The it- and st-uniform PMMAs with hydroxy end-group were prepared and reacted with sebacoyl dichloride to form uniform stereoblock PMMA. The stereoblock PMMA was found to form intra- and intermolecular stereocomplexes in acetone. A uniform stereoblock copolymer, it-PMMA-block-st-poly(ethyl methacrylate), was prepared and its stereocomplex formation was also studied. [References: 30]