论文部分内容阅读
借助动态光散射(DLS)和原子力显微镜(AFM)研究了具有复杂结构的comb-coil型聚苯乙烯-异戊二烯嵌段共聚物(S-graft-I)-block-S在聚异戊二烯(PI)选择性溶剂正烷烃中的自组装行为.结果表明comb-coil型分子在庚烷中形成球形胶束.同时,这些胶束的尺寸显示出独特的双分布现象.除常见的PS-PI相分离机理外,我们还提出一种comb-coil相分离机理.这些双分布胶束的形成可能正是两种相分离机理共存的结果.此外,借助透射电镜(TEM)进一步研究了选择性、接枝度和接枝链长度对自组装行为的影响.研究发现增加溶剂选择性或增加接枝链链长以及接枝度,有利于两种尺寸的胶束的形成以及对应分布峰的完全分离.
The comb-coil polystyrene-isoprene block copolymer (S-graft-I) -block-S with complex structure was studied by means of dynamic light scattering (DLS) and atomic force microscopy The results showed that the comb-coil molecules formed spherical micelles in heptane and the size of these micelles showed a unique bimodal distribution.In addition to the common In addition to the PS-PI phase separation mechanism, we also propose a comb-coil phase separation mechanism. The formation of these bimodal micelles may be the result of the coexistence of two phase separation mechanisms.Furthermore, by means of TEM, Selectivity, degree of grafting and graft chain length on the self-assembly behavior were studied.It was found that increasing solvent selectivity or increasing the chain length and degree of grafting favored the formation of micelles of two sizes and their corresponding distribution peaks Complete separation.