Surface-induced phase transition of asymmetric diblock copolymer in selective solvents.
Surface-induced phase transition of asymmetric diblock copolymer in selective solvents.
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DOI：
10.1021/jp064268
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
Rong Wang;Zhibin Jiang;Yeng-Long Chen;G. Xue
中科院分区：
文献类型：
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作者：
Rong Wang;Zhibin Jiang;Yeng-Long Chen;G. Xue
首次采用实空间自洽场理论（SCFT）研究了不对称两嵌段共聚物在选择性溶剂中的表面诱导相变。通过改变两个平行硬表面之间的距离（或膜厚度）W和嵌段共聚物浓度f（p），预测了几种形貌并构建了相图。稀溶液中的自组装形态的二嵌段共聚物被发现与不同的膜厚度的显着变化。在受限体系中，由于聚合物构象熵的损失，在本体溶液中发现的稳定形态变得不稳定。我们发现，在一个非常稀的嵌段共聚物溶液中，相分离可以诱导通过聚合物耗尽的溶液变得更加局限。我们的研究结果提供了一个有趣的起点，在实验和理论研究的局限性嵌段共聚物的解决方案重新努力。
Surface-induced phase transition of asymmetric diblock copolymer in selective solvents is first theoretically investigated by using the real-space version of self-consistent field theory (SCFT). By varying the distance between two parallel hard surfaces (or the film thickness) W and the block copolymer concentration f(p), several morphologies are predicted and the phase diagram is constructed. Self-assembly morphologies of the diblock copolymer in dilute solution are found to change significantly with different film thickness. In confined systems, stable morphologies found in the bulk solution become unstable due to the loss of polymer conformation entropy. We find that in a very dilute block copolymer solution, phase separation can be induced through polymer depletion as the solution becomes more confined. Our findings provide an interesting starting point for a renewed effort in both experimental and theoretical investigations of confined block copolymer solutions.