Orientation-Dependent Order鈥揇isorder Transition of Block Copolymer Lamellae in Electric Fields

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• 作者：Heiko G. Schoberth ; Christian W. Pester ; Markus Ruppel ; Volker S. Urban ; Alexander B枚ker
• 刊名：ACS Macro Letters
• 出版年：2013
• 出版时间：June 18, 2013
• 年：2013
• 卷：2
• 期：6
• 页码：469-473
• 全文大小：296K
• 年卷期：v.2,no.6(June 18, 2013)
• ISSN：2161-1653

文摘

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 (蠁) affects the shift in the order鈥揹isorder transition temperature (T_ODT) 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 螖T_ODT cos² 蠁, in accordance with theory.