The influence of confinement and curvature on the morphology of block copolymers
The influence of confinement and curvature on the morphology of block copolymers
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DOI：
10.1002/polb.20641
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发表时间：
2005-12
期刊：
影响因子：
--
通讯作者：
Hongqi Xiang;Kyusoon Shin;Taehyung Kim;S. Moon;T. J. McCarthy;T. Russell
中科院分区：
文献类型：
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作者：
Hongqi Xiang;Kyusoon Shin;Taehyung Kim;S. Moon;T. J. McCarthy;T. Russell
在本体中，在平衡时，二嵌段共聚物微相分离成纳米级形态，从体心立方阵列的球体到六边形填充的圆柱体到交替的薄片，这取决于组分的体积分数。然而，当嵌段共聚物被迫进入圆柱形孔中时，其中孔的直径仅为共聚物形态的几个重复周期或更少，则共聚物周期和孔径的可互换性可对微区形态施加挫折。此外，由于小的孔径，在微区形态上强制弯曲。在组合的共聚物和孔壁的嵌段之间的界面相互作用，一个组件的优先隔离的墙壁，空间限制和强迫曲率示出诱导过渡的基本形态的共聚物中看到的散装。由于这些约束，层状形态转化为环面型形态，圆柱体被迫成为螺旋，体心立方阵列的球体被迫成为螺旋阵列的球体。新的形态，不能在批量访问，打开了一个大阵列的纳米结构，可用作模板和支架的无机纳米结构材料的制造。© 2005 Wiley Periodicals，Inc.聚合物科学杂志B部分：聚合物物理43：3377-3383，2005
In the bulk, at equilibrium, diblock copolymers microphase separated into nanoscopic morphologies ranging from body-centered cubic arrays of spheres to hexagonally packed cylinders to alternating lamellae, depending on the volume fraction of the components. However, when the block copolymers are forced into cylindrical pores, where the diameter of the pores are only several repeat periods of the copolymer morphology or less, then commensurability of the copolymer period and the pore diameter can impose a frustration on the microdomain morphology. In addition, due to the small pore diameter, a curvature is forced on the microdomain morphology. In combination with interfacial interactions between the blocks of the copolymer and the pore walls, the preferential segregation of one component to the walls, spatial confinement and forced curvature are shown to induce transitions in the fundamental morphology of the copolymers seen in the bulk. Lamellar morphologies transformed into torus-type morphologies, cylinders are forced into helices, and body-centered cubic arrays of spheres are force into helical arrays of spheres due to these restraints. The novel morphologies, not accesssible in the bulk, open a large array of nanoscopic structures that can be used as templates and scaffolds for the fabrication of inorganic nanostructured materials. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 3377–3383, 2005