Formation of Tetragonally-Packed Rectangular Cylinders from ABC Block Terpolymer Blends
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- 作者：Yusuke Asai ; Kotaro Yamada ; Mutsuhiko Yamada ; Atsushi Takano ; Yushu Matsushita
- 刊名：ACS Macro Letters
- 出版年：2014
- 出版时间：February 18, 2014
- 年：2014
- 卷：3
- 期：2
- 页码：166-169
- 全文大小：349K
- ISSN：2161-1653
文摘
Effect of composition distribution of ABC linear terpolymers on the formation of periodic structures was investigated. Five poly(isoprene-b-styrene-b-2-vinylpyridine) (ISP) triblock terpolymers with almost constant molecular weights of ca. 130k and with similar center-block fraction at around 0.55, were blended variously. It has been found that tricontinuous gyroid structures gradually transform into a cylindrical structure whose rectangular cylinders are packed tetragonally if composition distribution increases. Further experiments by 3D-TEM observation on binary equimolar mixtures of two molecules with similar molecular weights of 122k and 124k, giving the average composition of 蠁I/蠁S/蠁P = 0.23/0.59/0.18, has verified to show more evident rectangular-shaped cylinders with 4-fold symmetry. This new structure, having periodic surfaces with nonconstant mean-curvature, could be formed due to the systematic localization of component polymer chains along the domain interfaces.