%0 journal article
%@ 0024-9297
%A Higuchi, T., Sugimori, H., Jiang, X., Hong, S., Matsunaga, K., Kaneko, T., Abetz, V., Takahara, A., Jinnai, H.

%D 2013
%J Macromolecules
%N 17
%P 6991-6997 
%R doi:10.1021/ma401193u
%T Morphological Control of Helical Structures of an ABC-Type Triblock Terpolymer by Distribution Control of a Blending Homopolymer in a Block Copolymer Microdomain
%U https://doi.org/10.1021/ma401193u
17 
%X 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.