Morphological Control of Helical Structures of an ABC-Type Triblock Terpolymer by Distribution Control of a Blending Homopolymer in a Block Copolymer Microdomain
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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DOI：
10.1021/ma401193u
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发表时间：
2013-08
期刊：
影响因子：
5.5
通讯作者：
T. Higuchi;H. Sugimori;Xi Jiang;Song Hong;Kazuyuki Matsunaga;T. Kaneko;V. Abetz;A. Takahara
中科院分区：
文献类型：
--
作者：
T. Higuchi;H. Sugimori;Xi Jiang;Song Hong;Kazuyuki Matsunaga;T. Kaneko;V. Abetz;A. Takahara
用透射电子显微层析技术研究了苯乙烯-丁二烯-甲基丙烯酸甲酯嵌段共聚物（SBM）微相分离结构的三维控制。纯SBM在聚甲基丙烯酸甲酯基体中自组装成聚丁二烯（PB）微区围绕六边形填充的聚苯乙烯（PS）圆柱体的双螺旋结构。当PS均聚物的分子量低于SBM中PS嵌段的分子量时，PB结构域从双螺旋结构转变为球形结构域，同时保持螺旋轨迹。相比之下，向SBM中加入较高分子量的PS改变了螺旋结构，从双链结构变为三链结构，甚至变为四链结构。共混聚苯乙烯在聚苯乙烯微区中的分布对聚丁二烯微区的螺旋结构有很大的影响。
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.