Design of High-Density Helical Polymer Brush on Silica Nanoparticles for the Size Recognition of Fullerene Molecules

作者：Sato Masanao; Kato Tomoki; Shimamoto Hitoshi; Kamitani Kazutaka; Ohta Noboru; Hirai Tomoyasu^*; Takahara Atsushi^*

来源：ACS Macro Letters, 2018, 7(2): 148-152.

DOI：10.1021/acsmacrolett.7b00906

High-density syndiotactic poly(methyl methacrylate) (st-PMMA) brushes form a helical structure and encapsulate fullerene molecules in their helical cavities, leading to a PMMA brush/fullerene inclusion complex. The brushes recognize the size of guest molecules and spontaneously adapt their helical diameter to the guest molecules. Both polymer brush/C-60 and polymer brush/C-70 inclusion complex on the flat substrate were characterized on the basis of grazing incidence wide-angle X-ray diffraction (GIWAXD) measurements, and it is revealed that the main chains oriented perpendicular to the substrate. Moreover, high-density st-PMMA brushes grafted onto nanoparticles efficiently separate C-70 molecules from the mixture of C-60 and C-70 solution. Even after 5X repeating process, the selectivity for C-70 molecules remains at 99%.

• 出版日期2018-2