Self-assembly of star ABC triblock copolymer thin films: self-consistent field theory.
Self-assembly of star ABC triblock copolymer thin films: self-consistent field theory.
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DOI：
10.1021/jp801675z
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
Wen-Ming Han;P. Tang;Xuan Li;F. Qiu;Hong-dong Zhang;Yuliang Yang
中科院分区：
文献类型：
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作者：
Wen-Ming Han;P. Tang;Xuan Li;F. Qiu;Hong-dong Zhang;Yuliang Yang
用自洽场理论（SCFT）结合“掩蔽”技术研究了星星型ABC三嵌段共聚物受限于两个相同平行壁面（对称润湿或去润湿）之间的微相分离和形态.特别是，我们研究了限制的近对称星星三嵌段共聚物的对称和不对称的相互作用下的膜厚度和表面场的函数的形态。在空间受限程度（膜厚与体周期之比）和表面场的相互作用下，受限星星ABC三嵌段共聚物表现出丰富的相行为。在参数空间中，我们已经探索，薄膜的形态描述的四个主要类别，包括圆柱体，穿孔laminates，laminates，和其他复杂的混合结构。其中一些涉及新颖的结构，例如连续矩阵中的球体和具有交替螺旋结构的圆柱体，观察到它们在合适的膜厚度和表面场下是稳定的。特别是，复杂的混合网络结构中的散装圆柱形形成的星星三嵌段共聚物的薄膜被发现时，自然域周期是不相称的膜厚度。此外，强表面场被发现是更显着的比空间限制在改变形态的星星三嵌段共聚物在本体。这些发现为通过几何限制和表面场设计涉及星星三嵌段共聚物的新型微结构提供了指导。
Microphase separation and morphology of star ABC triblock copolymers confined between two identical parallel walls (symmetric wetting or dewetting) are investigated with self-consistent field theory (SCFT) combined with the "masking" technique to describe the geometric confinement of the films. In particular, we examine the morphology of confined near-symmetric star triblock copolymers under symmetric and asymmetric interactions as a function of the film thickness and the surface field. Under the interplay between the degree of spatial confinement, characterized by the ratio of the film thickness to bulk period, and surface field, the confined star ABC triblock copolymers are found to exhibit a rich phase behavior. In the parameter space we have explored, the thin film morphologies are described by four primary classes including cylinders, perforated lamellae, lamellae, and other complex hybrid structures. Some of them involve novel structures, such as spheres in a continuous matrix and cylinders with alternating helices structure, which are observed to be stable with suitable film thickness and surface field. In particular, complex hybrid network structures in thin films of bulk cylinder-forming star triblock copolymers are found when the natural domain period is not commensurate with the film thickness. Furthermore, a strong surface field is found to be more significant than the spatial confinement on changing the morphology of star triblock copolymers in bulk. These findings provide a guide to designing novel microstructures involving star triblock copolymers via geometric confinement and surface fields.