Morphological Control of Helical Structures of an ABC-Type Triblock Terpolymer by Distribution Control of a Blending Homopolymer in a Block Copolymer Microdomain

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• 作者：Takeshi Higuchi ; Hidekazu Sugimori ; Xi Jiang ; Song Hong ; Kazuyuki Matsunaga ; Takeshi Kaneko ; Volker Abetz ; Atsushi Takahara ; Hiroshi Jinnai
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：September 10, 2013
• 年：2013
• 卷：46
• 期：17
• 页码：6991-6997
• 全文大小：390K
• 年卷期：v.46,no.17(September 10, 2013)
• ISSN：1520-5835

文摘

The control of microphase-separated structures in a poly(styrene-block-butadiene-block-methyl methacrylate) (SBM) was investigated in three dimensions by transmission electron microtomography. Neat SBM self-assembled into a double-helical structure of polybutadiene (PB) domains around hexagonally packed core polystyrene (PS) cylinders in a poly(methyl methacrylate) matrix. When PS homopolymer with a lower molecular weight than that of the PS block in SBM was added to the SBM, the PB domains transformed from double-helical structures to spherical domains, while maintaining the helical trajectories. In contrast, adding a higher molecular weight PS to the SBM changed the helical structures from double- to triple-stranded structures and even to four-stranded structures. The helical structures of the PB domains were strongly affected by the distribution of the blended polystyrenes in the core cylindrical PS domains.