The diblock copolymers of methyl acrylate and perfluoroalkyl ethyl acrylate(FAEA) were synthesized by atom transfer radical polymerization (ATRP).GPC, 1H-NMR and fluorine-elementary analysis (F-EA) were used to study ...The diblock copolymers of methyl acrylate and perfluoroalkyl ethyl acrylate(FAEA) were synthesized by atom transfer radical polymerization (ATRP).GPC, 1H-NMR and fluorine-elementary analysis (F-EA) were used to study the structure of the block copolymers.To combine GPC with NMR and to combine GPC with F-EA were used to calculate the block length.It was found interestingly that the results of 1H-NMR showed a “temperature-dependent" feature.It means the relative ratios of MA block to FAEA block calculated from NMR were changed with measuring temperature.It might be caused by the formation of molecular association.Temperature and solvents can affect the degree of association.Therefore, 1H-NMR and GPC can’t be used in quantitative analysis of the fluorinated diblock copolymer.To combine GPC with F-EA is suitable for the characterization of fluorinated diblock copolymers.展开更多
To avoid the damage to catalytic system in ATRP by the carboxyl groups in vinyl benzoic acid, a well defined poly( p vinyl benzoic acid) was synthesized via ATRP in the tertiary butyl ester form. The ATRP of t butyl p...To avoid the damage to catalytic system in ATRP by the carboxyl groups in vinyl benzoic acid, a well defined poly( p vinyl benzoic acid) was synthesized via ATRP in the tertiary butyl ester form. The ATRP of t butyl p vinyl benzoate ( t BVB) was studied kinetically. The results showed that t BVB can be polymerized in a controlled way by ATRP. It was found that the polymerization rate of t BVB is much faster than that of St, meaning that the electron withdrawing ester group affects the polymerization obviously. Well defined diblock copolymers of St and t BVB were prepared by using bromo terminated PBVBs as macroinitiators via ATRP. After removal of the t butyl group by hydrolysis, well defined amphiphilic diblock copolymers of styrene and p vinyl benzoic acid (PSt b PBVA) were obtained.展开更多
Block copolymerization of methyl methacrylate(MMA)ms and 2,2,3,3,4,4,5,5-octafluoropentyl acrylate(OFPA) was conducted at 25℃ in water dispersion system catalyzed and initiated by CuBr/CuBr 2/1,10-phenanthroline(phen...Block copolymerization of methyl methacrylate(MMA)ms and 2,2,3,3,4,4,5,5-octafluoropentyl acrylate(OFPA) was conducted at 25℃ in water dispersion system catalyzed and initiated by CuBr/CuBr 2/1,10-phenanthroline(phen)/ethyl 2-bromoisobutyrate(EBiB) or CuCl/phen/EBiB in the presence of sodium lauryl sulfonate and sodium perfluorononenyloxyl benzene sulfonate.The results of GPC and 1H-NMR characterization demonstrated that a fluorine-containing block copolymer composed of MMA and OFPA was successfully synthesized in such a water dispersion system.The water-resistance performance of the PMMA film surface was greatly improved when only 2?wt%(based on PMMA) of the resulted fluorine-containing block copolymer was employed as the film surface enhance agent.展开更多
文摘The diblock copolymers of methyl acrylate and perfluoroalkyl ethyl acrylate(FAEA) were synthesized by atom transfer radical polymerization (ATRP).GPC, 1H-NMR and fluorine-elementary analysis (F-EA) were used to study the structure of the block copolymers.To combine GPC with NMR and to combine GPC with F-EA were used to calculate the block length.It was found interestingly that the results of 1H-NMR showed a “temperature-dependent" feature.It means the relative ratios of MA block to FAEA block calculated from NMR were changed with measuring temperature.It might be caused by the formation of molecular association.Temperature and solvents can affect the degree of association.Therefore, 1H-NMR and GPC can’t be used in quantitative analysis of the fluorinated diblock copolymer.To combine GPC with F-EA is suitable for the characterization of fluorinated diblock copolymers.
文摘To avoid the damage to catalytic system in ATRP by the carboxyl groups in vinyl benzoic acid, a well defined poly( p vinyl benzoic acid) was synthesized via ATRP in the tertiary butyl ester form. The ATRP of t butyl p vinyl benzoate ( t BVB) was studied kinetically. The results showed that t BVB can be polymerized in a controlled way by ATRP. It was found that the polymerization rate of t BVB is much faster than that of St, meaning that the electron withdrawing ester group affects the polymerization obviously. Well defined diblock copolymers of St and t BVB were prepared by using bromo terminated PBVBs as macroinitiators via ATRP. After removal of the t butyl group by hydrolysis, well defined amphiphilic diblock copolymers of styrene and p vinyl benzoic acid (PSt b PBVA) were obtained.
文摘Block copolymerization of methyl methacrylate(MMA)ms and 2,2,3,3,4,4,5,5-octafluoropentyl acrylate(OFPA) was conducted at 25℃ in water dispersion system catalyzed and initiated by CuBr/CuBr 2/1,10-phenanthroline(phen)/ethyl 2-bromoisobutyrate(EBiB) or CuCl/phen/EBiB in the presence of sodium lauryl sulfonate and sodium perfluorononenyloxyl benzene sulfonate.The results of GPC and 1H-NMR characterization demonstrated that a fluorine-containing block copolymer composed of MMA and OFPA was successfully synthesized in such a water dispersion system.The water-resistance performance of the PMMA film surface was greatly improved when only 2?wt%(based on PMMA) of the resulted fluorine-containing block copolymer was employed as the film surface enhance agent.
