Ree Brian J, Satoh Toshifumi, Yamamoto Takuya
Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan.
Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
Polymers (Basel). 2019 Jan 17;11(1):163. doi: 10.3390/polym11010163.
In this study, we investigate structures and stabilities of the micelles of a cyclic amphiphile (-PBA--PEO) composed of poly(-butyl acrylate) (PBA) and poly(ethylene oxide) (PEO) blocks and its linear diblock and triblock analogues (-PBA--PEO and -PBA--PEO--PBA) by using synchrotron X-ray scattering and quantitative data analysis. The comprehensive scattering analysis gives details and insights to the micellar architecture through structural parameters. Furthermore, this analysis provides direct clues for structural stabilities in micelles, which can be used as a good guideline to design highly stable micelles. Interestingly, in water, all topological polymers are found to form ellipsoidal micelles rather than spherical micelles; more interestingly, the cyclic polymer and its linear triblock analog make oblate-ellipsoidal micelles while the linear diblock analog makes a prolate-ellipsoidal micelle. The analysis results collectively inform that the cyclic topology enables more compact micelle formation as well as provides a positive impact on the micellar structural integrity.
在本研究中，我们通过同步辐射X射线散射和定量数据分析，研究了由聚（丙烯酸丁酯）（PBA）和聚（环氧乙烷）（PEO）嵌段组成的环状两亲物（-PBA--PEO）及其线性二嵌段和三嵌段类似物（-PBA--PEO和-PBA--PEO--PBA）胶束的结构和稳定性。全面的散射分析通过结构参数给出了胶束结构的细节和见解。此外，该分析为胶束中的结构稳定性提供了直接线索，可作为设计高度稳定胶束的良好指导。有趣的是，在水中，所有拓扑聚合物都形成椭球状胶束而非球状胶束；更有趣的是，环状聚合物及其线性三嵌段类似物形成扁椭球状胶束，而线性二嵌段类似物形成长椭球状胶束。分析结果共同表明，环状拓扑结构能够形成更紧凑的胶束，并且对胶束的结构完整性有积极影响。
