Orientation-Dependent Order-Disorder Transition of Block Copolymer Lamellae in Electric Fields.
Orientation-Dependent Order-Disorder Transition of Block Copolymer Lamellae in Electric Fields.
复制标题
DOI：
10.1021/mz400013u
复制
发表时间：
2013-05
影响因子：
5.8
通讯作者：
H. Schoberth;Christian W. Pester;M. Ruppel;V. Urban;A. Böker
中科院分区：
文献类型：
--
作者：
H. Schoberth;Christian W. Pester;M. Ruppel;V. Urban;A. Böker
电场已被证明可以稳定近临界嵌段共聚溶液的无序相。在这里，我们使用原位同步辐射小角X射线散射来研究层状区相对于外场的初始取向(φ)如何影响聚(苯乙烯-b-异戊二烯)在甲苯中的溶致溶液的有序-无序转变温度(TOTD)。我们发现了相变温度的下移，该相变温度与片层取向成Δtodt∼cos 2φ的比例符合理论。
Electric fields have been shown to stabilize the disordered phase of near-critical block copolymer solutions. Here, we use in situ synchrotron small-angle X-ray scattering to examine how the initial orientation of lamellar domains with respect to the external field (φ) affects the shift in the order-disorder transition temperature (TODT) of lyotropic solutions of poly(styrene-b-isoprene) in toluene. We find a downward shift of the transition temperature, which scales with lamellar orientation as ΔTODT ∼ cos2 φ, in accordance with theory.