Square and rectangular symmetry tiles from bulk and thin film 3-miktoarm star terpolymers.
Square and rectangular symmetry tiles from bulk and thin film 3-miktoarm star terpolymers.
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DOI：
10.1002/smll.201300657
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发表时间：
2013-12
期刊：
影响因子：
13.3
通讯作者：
K. Aissou;A. Nunns;I. Manners;C. Ross
中科院分区：
文献类型：
--
作者：
K. Aissou;A. Nunns;I. Manners;C. Ross
本文报道了3-miktoarm星星状聚异戊二烯-聚苯乙烯-聚二茂铁乙基甲基硅烷（3μ-ISF）定向自组装成（4.8²）正方对称的阿基米德镶嵌图案。3μ-ISF的块体样品在退火时产生平衡柱状（4.8²）瓦片图案（对称性p 4 mm），在此之前是亚稳态c 2 mm中心矩形结构。与此相反，在3μ-ISF与PS均聚物共混的薄膜中，当薄膜厚度小于50 nm时，c2 mm相稳定，柱状物取向出平面。而当膜厚约为80 nm时，3μ-ISF/均聚物共混物迅速形成p4 mm对称结构，晶粒尺寸为几μm，有序性好。描述了p4 mm结构中的缺陷.
The directed self assembly of a 3-miktoarm star terpolymer (polyisoprene-arm-polystyrene-arm-polyferrocenylethylmethylsilane (3μ-ISF)) into a (4.8²) square symmetry Archimedean tiling pattern is described. Bulk samples of 3μ-ISF generate equilibrium columnar (4.8²) tile patterns (symmetry p 4 mm) on annealing, which is preceded by a metastable c 2 mm centered rectangular structure. In contrast, in thin films of 3μ-ISF blended with PS homopolymer, the c 2 mm phase is stable with columns oriented out of plane when the film thickness is below 50 nm. However, the 3μ-ISF/homopolymer blend rapidly forms a p 4 mm symmetry when the film thickness is ∼80 nm, with grain sizes of several μm and excellent order. Defects in the p 4 mm structure are described.