The optically active polymers of (-) menthyl methacrylate were obtained by anionic, group transfer polymerization(GTP) and radical polymerization methods. The influences of different polymerization methods on specific...The optically active polymers of (-) menthyl methacrylate were obtained by anionic, group transfer polymerization(GTP) and radical polymerization methods. The influences of different polymerization methods on specific rotation, yield and stereoregularity of polymers were studied. In the fluorene lithium and ( S,S ) (+) 2,3 dimethoxy 1,4 bis(dimethylamino)butane complex initiative system, the specific rotation values rise slightly with the increase of molecular weight. There is no obvious difference in the specific rotation values of PMnMAs obtained by different polymerization methods, but there is an obvious variation in stereoregularity of the polymers. And the change of the optical activity of PMnMA is slight as compared with the variation of the stereoregularity. The tacticity of polymers is mainly syndiotactic.展开更多
We report here an approach toward the synthesis of optically active polyacrylamide bearing amino acid moieties, poly[Nmethacryloyl L-leucine methyl ester] （PMALM）, with controlled average number molecular weight （M...We report here an approach toward the synthesis of optically active polyacrylamide bearing amino acid moieties, poly[Nmethacryloyl L-leucine methyl ester] （PMALM）, with controlled average number molecular weight （Mn） and relatively narrow polydispersity index （PDI, Mw/Mn 〈 1.3） by atom transfer radical polymerization （ATRP） using initiating system methyl 2-bromopropionate/CuBr/tris（2-dimethylaminoethyl） amine. The optical properties of the resulting polymers were evaluated from specific optical rotation value and CD spectra.展开更多
文摘The optically active polymers of (-) menthyl methacrylate were obtained by anionic, group transfer polymerization(GTP) and radical polymerization methods. The influences of different polymerization methods on specific rotation, yield and stereoregularity of polymers were studied. In the fluorene lithium and ( S,S ) (+) 2,3 dimethoxy 1,4 bis(dimethylamino)butane complex initiative system, the specific rotation values rise slightly with the increase of molecular weight. There is no obvious difference in the specific rotation values of PMnMAs obtained by different polymerization methods, but there is an obvious variation in stereoregularity of the polymers. And the change of the optical activity of PMnMA is slight as compared with the variation of the stereoregularity. The tacticity of polymers is mainly syndiotactic.
基金the National Natural Science Foundation of China （No. 20474068） the Natural Science Foundation of Guangdong Province （No. 021471） are gratefully acknowledged.
文摘We report here an approach toward the synthesis of optically active polyacrylamide bearing amino acid moieties, poly[Nmethacryloyl L-leucine methyl ester] （PMALM）, with controlled average number molecular weight （Mn） and relatively narrow polydispersity index （PDI, Mw/Mn 〈 1.3） by atom transfer radical polymerization （ATRP） using initiating system methyl 2-bromopropionate/CuBr/tris（2-dimethylaminoethyl） amine. The optical properties of the resulting polymers were evaluated from specific optical rotation value and CD spectra.
