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/C₆₀ and polymer brush/C₇₀ 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 C₇₀ molecules from the mixture of C₆₀ and C₇₀ solution. Even after 5× repeating process, the selectivity for C₇₀ molecules remains at 99%.

中文翻译：

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二氧化硅纳米粒子上高密度螺旋聚合物刷的设计用于富勒烯分子的尺寸识别

高密度间规聚甲基丙烯酸甲酯 ( st - PMMA) 刷形成螺旋结构并将富勒烯分子封装在其螺旋腔中，从而形成 PMMA 刷/富勒烯包合物。刷子识别客体分子的大小，并自发地使它们的螺旋直径适应客体分子。基于掠入射广角 X 射线衍射 (GIWAXD) 测量对平面基底上的聚合物刷/C ₆₀和聚合物刷/C ₇₀包合物进行了表征，表明主链垂直于基质。此外，接枝到纳米颗粒上的高密度st -PMMA 刷可有效分离 C _{70C 60}和 C ₇₀溶液的混合物中的分子。即使经过 5 次重复过程，C ₇₀分子的选择性仍保持在 99%。