Two-Dimensional Ordering in Block Copolymer Monolayer Thin Films upon Selective Solvent Annealing
Two-Dimensional Ordering in Block Copolymer Monolayer Thin Films upon Selective Solvent Annealing
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DOI：
10.1021/ma800753a
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发表时间：
2008-07
期刊：
影响因子：
5.5
通讯作者：
You Wang;Xiao Hong;Baoquan Liu;Changyou Ma;Chun-xiu Zhang
中科院分区：
文献类型：
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作者：
You Wang;Xiao Hong;Baoquan Liu;Changyou Ma;Chun-xiu Zhang
用原子力显微镜（AFM）研究了聚（苯乙烯-乙烯/丁烯-苯乙烯）单层薄膜在环己烷（聚（乙烯/丁烯）嵌段的选择性溶剂）蒸汽中退火后的形貌演变。通过对样品表面2 × 2 μm2的标记区域进行多次非原位退火处理，揭示了从无序短柱到有序长柱再到有序六方球的二维有序化路径信息。结果表明，整个有序化过程包括：（1）从无序圆柱体到半无序相的循环转变过程，在此过程中，圆柱体的有序性逐渐提高;（2）从有序圆柱体到六角球的夹断过程。我们注意到，有序化的一部分是以形核和生长的方式发生的，但似乎其余部分的有序化涉及到失稳和失稳。
The morphology evolution of poly(styrene−ethylene/butylene−styrene) monolayer thin films upon “annealing” in the vapor of cyclohexane, a selective solvent for majority poly(ethylene/butylene) block, was investigated by atomic force microscopy (AFM). The pathway information on the two-dimensional ordering from poorly ordered short cylinders, to aligned long cylinders, and then to well-ordered hexagonal spheres was revealed by repeatedly taking images of the same marked area of 2 × 2 μm2 on the sample surface after ex-situ annealing treatments. It was found that the whole ordering process consists of (1) the cyclic transitions between poorly ordered cylinders and semidisordered phase via poorly ordered spheres, during which the orderliness of cylinders gradually improves, and (2) the pinching-off from enough-ordered cylinders into hex-spheres. It was noticed that part of the ordering takes place in the way of nucleation and growth, but it seems that the remaining part of ordering involves spinodal and decom...