利用动态光散射、透射电镜研究了嵌段共聚物聚苯乙烯 b 聚丙烯酸(PS b PAA)与均聚物聚苯乙烯(PS)在选择性溶剂水中的自组装行为.由于均聚物PS与PS嵌段具有相同的结构单元,均聚物PS参与胶束的形成,和嵌段共聚物的PS链段一同组成胶束的核...利用动态光散射、透射电镜研究了嵌段共聚物聚苯乙烯 b 聚丙烯酸(PS b PAA)与均聚物聚苯乙烯(PS)在选择性溶剂水中的自组装行为.由于均聚物PS与PS嵌段具有相同的结构单元,均聚物PS参与胶束的形成,和嵌段共聚物的PS链段一同组成胶束的核;在适当的均聚物分子量和含量条件下,PS b PAA PS可以自组装形成单分散的纳米胶束;通过改变体系中均聚物PS的分子量和含量可在较大范围内调变胶束的尺寸.展开更多
On the basis of former reports,C 60Cl n was used as a novel coupling agent to react with active polymer chains in anionic polymerization of styrene and copolymerization of styrene and isoprene initiated by n-BuLi, res...On the basis of former reports,C 60Cl n was used as a novel coupling agent to react with active polymer chains in anionic polymerization of styrene and copolymerization of styrene and isoprene initiated by n-BuLi, respectively.The UV-Vis spectra of coupling products showed that C 60Cl n was bonded to the polymer chain.The various samples were analyzed by GPC using a refractive index(RI) detector and an ultraviolet(UV) detector set at 340?nm for the absorption of C 60 and its derivatives.The results revealed that there is a new peak containing C 60 after coupling reaction between C 60Cl n and polymer chains,and the polydispersity of the coupling products is broadened,which demonstrated that coupling reaction has taken place and polymer chains are covalently bonded to the molecule of C 60Cl n.It was calculated that about two polystyrene chains are attached to a C 60Cl n molecule,and it demonstrated that two mechanisms,i.e.substitution reaction and addition reaction,have taken place simultaneously during the coupling reaction.展开更多
文摘利用动态光散射、透射电镜研究了嵌段共聚物聚苯乙烯 b 聚丙烯酸(PS b PAA)与均聚物聚苯乙烯(PS)在选择性溶剂水中的自组装行为.由于均聚物PS与PS嵌段具有相同的结构单元,均聚物PS参与胶束的形成,和嵌段共聚物的PS链段一同组成胶束的核;在适当的均聚物分子量和含量条件下,PS b PAA PS可以自组装形成单分散的纳米胶束;通过改变体系中均聚物PS的分子量和含量可在较大范围内调变胶束的尺寸.
文摘On the basis of former reports,C 60Cl n was used as a novel coupling agent to react with active polymer chains in anionic polymerization of styrene and copolymerization of styrene and isoprene initiated by n-BuLi, respectively.The UV-Vis spectra of coupling products showed that C 60Cl n was bonded to the polymer chain.The various samples were analyzed by GPC using a refractive index(RI) detector and an ultraviolet(UV) detector set at 340?nm for the absorption of C 60 and its derivatives.The results revealed that there is a new peak containing C 60 after coupling reaction between C 60Cl n and polymer chains,and the polydispersity of the coupling products is broadened,which demonstrated that coupling reaction has taken place and polymer chains are covalently bonded to the molecule of C 60Cl n.It was calculated that about two polystyrene chains are attached to a C 60Cl n molecule,and it demonstrated that two mechanisms,i.e.substitution reaction and addition reaction,have taken place simultaneously during the coupling reaction.
