Polymeric quasicrystal: Mesoscopic quasicrystalline tiling in ABC star polymers
Polymeric quasicrystal: Mesoscopic quasicrystalline tiling in ABC star polymers
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DOI：
10.1103/physrevlett.98.195502
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发表时间：
2007-05-11
影响因子：
8.6
通讯作者：
Matsushita, Yushu
中科院分区：
文献类型：
--
作者：
Hayashida, Kenichi;Dotera, Tomonari;Matsushita, Yushu
在由聚异戊二烯、聚苯乙烯和聚（2-乙烯基吡啶）组成的三组分聚合物体系中观察到具有12重对称性的介观镶嵌图案，所述三组分聚合物体系形成星形镶嵌物和聚苯乙烯均聚物共混物。透射电子显微镜图像揭示了覆盖着等边三角形和正方形的非周期性平铺图案，它们的三角形/正方形数比为2.3（近似于4/根3），并且微束X射线衍射图案显示十二边形对称性。对于金属合金（类似于0.5 nm）、硫族化物（类似于2 nm）和液晶（类似于10 nm），已经发现了相同种类的准晶结构。目前的结果（类似于50 nm）证实了十二方准晶在几个层次的长度尺度的普遍性质。
A mesoscopic tiling pattern with 12-fold symmetry has been observed in a three-component polymer system composed of polyisoprene, polystyrene, and poly(2-vinylpyridine) which forms a star-shaped terpolymer, and a polystyrene homopolymer blend. Transmission electron microscopy images reveal a nonperiodic tiling pattern covered with equilateral triangles and squares, their triangle/square number ratio of 2.3 (approximate to 4/root 3), and a microbeam x-ray diffraction pattern shows dodecagonal symmetry. The same kind of quasicrystalline structures have been found for metal alloys (similar to 0.5 nm), chalcogenides (similar to 2 nm), and liquid crystals (similar to 10 nm). The present result (similar to 50 nm) confirms the universal nature of dodecagonal quasicrystals over several hierarchical length scales.