Effects of polydispersity on the order-disorder transition of diblock copolymer melts
Effects of polydispersity on the order-disorder transition of diblock copolymer melts
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DOI：
10.1140/epje/i2008-10383-6
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发表时间：
2008-11-01
影响因子：
1.8
通讯作者：
Matsen, M. W.
中科院分区：
文献类型：
--
作者：
Beardsley, T. M.;Matsen, M. W.
采用基于格子的Monte Carlo模拟方法研究了多分散性对AB两嵌段共聚物熔体的影响。我们认为熔体的对称组合物，其中的B块是单分散和A块是多分散的舒尔茨-齐姆分布。在协议与实验和自洽场理论（SCFT），我们发现，多分散性导致域的大小显着增加。它还诱导从平坦到弯曲界面的过渡，其中多分散嵌段位于界面曲率的内侧。最重要的是，模拟显示了与实验一致的有序-无序转变（ODT）的相对较小的转变，而SCFT错误地预测了向更高温度的相当大的转变。
The effect of polydispersity on an AB diblock copolymer melt is investigated using lattice-based Monte Carlo simulations. We consider melts of symmetric composition, where the B blocks are monodisperse and the A blocks are polydisperse with a Schultz-Zimm distribution. In agreement with experiment and self-consistent field theory (SCFT), we find that polydispersity causes a significant increase in domain size. It also induces a transition from flat to curved interfaces, with the polydisperse blocks residing on the inside of the interfacial curvature. Most importantly, the simulations show a relatively small shift in the order-disorder transition (ODT) in agreement with experiment, whereas SCFT incorrectly predicts a sizable shift towards higher temperatures.