Hierarchical Nanostructures of Bent-Core Molecules Blended with Poly(styrene-b-4-vinylpyridine) Block Copolymer

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• 作者：Kishore K. Tenneti ; Xiaofang Chen ; Christopher Y. Li ; Xinhua Wan ; Xinhe Fan ; Qi-Feng Zhou ; Lixia Rong ; Benjamin S. Hsiao
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：July 10, 2007
• 年：2007
• 卷：40
• 期：14
• 页码：5095 - 5102
• 全文大小：1317K
• 年卷期：v.40,no.14(July 10, 2007)
• ISSN：1520-5835

文摘

We report the phase structures observed in blends of poly(styrene-b-4-vinylpyridine) (PS-b-P4VP)block copolymer (BCP) and a bent-core molecule 1-[4'-(3' ',4' ',5' '-tridecyloxybenzoyloxy)phenyleneoxycarbonyl]-3-[(4'-hydroxyphenyl)oxycarbonyl]benzene (BP). Hydrogen bonding between the terminal -OH group of BPand pyridine of P4VP led to the formation of P4VP(BP)_n complex, which exhibited liquid crystalline (LC) order.This LC ordering, combined with microphase separation of the BCP, led to the formation of hierarchicalnanostructures. The phase structures of the blend samples were investigated as a function of the concentration ofBP using small-angle and wide-angle X-ray scattering and transmission electron microscopy techniques. Byincreasing the BP content, BCP phase morphology transformed from lamellae to cylinders. In the two casesinvestigated, the P4VP/BP complex formed a bilayer smectic A LC structure within the BCP domains, and theselayered structures were oriented perpendicular to the BCP interface. A detailed structural and morphologicalstudy will be reported.