摘要
Four armed star shaped copolymer of methyl methacrylate(MMA)/ N cyclohexylmaleimide(NCMI) with heat resistance was synthesized by atom transfer radical copolymerization with the CuBr/bpy catalyst in anisole, initiated by tetra(bromomethyl)benzene. A linear plot of ln( 0/) versus reaction time was obtained by using anisole as solvent. In contrast, the use of cyclohexanone as solvent results in that the rate of copolymerization decreases as the reaction proceeds. Using anisole as the solvent in the copolymerization, the molecular weight of the resultant copolymer(measured by triple detection SEC) increased linearly with the increase of conversion, and the molecular weight distributions are narrow. The glass transition temperature of the resultant copolymer was higher than that of the pure PMMA. The synthesized four armed star copolymer was used as macroinitiator for the cationic polymerization of 2 methyl 2 oxazoline to yield star shaped poly(MMA co NCMI)/poly(2 methyl 2 oxazoline) block copolymers. The approximately linear increase of the molecular weight with the increase of reaction time and the low molecular weight distribution demonstrate a controlled chain extension reaction.
Four armed star shaped copolymer of methyl methacrylate(MMA)/ N cyclohexylmaleimide(NCMI) with heat resistance was synthesized by atom transfer radical copolymerization with the CuBr/bpy catalyst in anisole, initiated by tetra(bromomethyl)benzene. A linear plot of ln( 0/) versus reaction time was obtained by using anisole as solvent. In contrast, the use of cyclohexanone as solvent results in that the rate of copolymerization decreases as the reaction proceeds. Using anisole as the solvent in the copolymerization, the molecular weight of the resultant copolymer(measured by triple detection SEC) increased linearly with the increase of conversion, and the molecular weight distributions are narrow. The glass transition temperature of the resultant copolymer was higher than that of the pure PMMA. The synthesized four armed star copolymer was used as macroinitiator for the cationic polymerization of 2 methyl 2 oxazoline to yield star shaped poly(MMA co NCMI)/poly(2 methyl 2 oxazoline) block copolymers. The approximately linear increase of the molecular weight with the increase of reaction time and the low molecular weight distribution demonstrate a controlled chain extension reaction.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第2期336-338,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :5 96 730 0 2 )资助
