Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, P. R. China.
Macromol Rapid Commun. 2017 Dec;38(23). doi: 10.1002/marc.201700437. Epub 2017 Sep 12.
The co-assembly process is an effective approach to construct hierarchically nanostructured soft materials, but morphological transition of co-assemblies upon external stimuli, particularly the "green" trigger CO , is not unraveled yet. Here, a segmented copolymer, poly(styrene)-block-poly[(4-vinyl pyridine)-random-((2-(diethylamino)ethyl methacrylate)] (P1), is used to co-assemble in the mixed solvent of dimethyl formamide and water with poly(ethylene oxide)-block-poly[(4-vinyl pyridine)-random-((2-(diethylamino)ethyl methacrylate)] (P2) and poly(ethylene oxide)-block-poly(acrylic acid) (P3), respectively. It is found that Janus micelles are generated from the P1-P2 pair in the presence of ferric ion, while wormlike micelles are formed from the P1-P3 duad. Upon stimulation with CO , Janus and wormlike aggregates are transferred into core-shell and spherical micelles, respectively.
共组装过程是构建分级纳米结构软材料的有效方法，但共组装体对外界刺激（特别是“绿色”触发 CO ）的形态转变尚未被揭示。在这里，使用嵌段共聚物聚（苯乙烯）-嵌段-聚[（4-乙烯基吡啶）-随机-（（2-（二乙氨基）乙基甲基丙烯酸酯）]（P1）与聚（氧化乙烯）-嵌段-聚[（4-乙烯基吡啶）-随机-（（2-（二乙氨基）乙基甲基丙烯酸酯）]（P2）和聚（氧化乙烯）-嵌段-聚（丙烯酸）（P3）在二甲基甲酰胺和水的混合溶剂中进行共组装。研究发现，在铁离子存在下，P1-P2 对生成了双节微囊；而 P1-P3 对则形成了蠕虫状胶束。用 CO 刺激后，Janus 和蠕虫状聚集物分别转化为核壳和球形胶束。
