Asymmetric Double Tetragonal Domain Packing from ABC Triblock Terpolymer Blends with Chain Length Difference
Asymmetric Double Tetragonal Domain Packing from ABC Triblock Terpolymer Blends with Chain Length Difference
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DOI：
10.1021/acs.macromol.6b01670
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发表时间：
2016-09-27
期刊：
影响因子：
5.5
通讯作者：
Matsushita, Yushu
中科院分区：
文献类型：
--
作者：
Asai, Yusuke;Takano, Atsushi;Matsushita, Yushu
观察到一个特定的相结构的二元共混物的聚（异戊二烯）-嵌段-聚（苯乙烯）-嵌段-聚（2-乙烯基吡啶）（ISP）的三嵌段共聚物的不对称链长的两个末端嵌段。四边形填充的圆柱体，从各种二元共混物上的广泛的体积分数，虽然I和P圆柱体的大小是高度不对称的。这些结构在单分散ABC三嵌段共聚物中是从未发现过的，并证实了其三个特征：（1）I型柱畴转变为棒状畴，其界面具有非恒定的平均曲率;（2）I/P型畴的横截面积比随各组分的体积分数定性变化;（3）P组分的球形畴和圆柱形畴共存。在本工作中采用的分子设计，即在两个母体三元共聚物的I和P嵌段都有相当大的链长差异，必须导致这些新的形态。
A specific phase structure was observed for binary blends of poly(isoprene)-block-poly(styrene)-block-poly(2-vinylpyridine) (ISP) triblock terpolymers with asymmetric chain lengths of two end-blocks. Tetragonal-packed cylinders were obtained from various binary blends on a wide range of volume fractions, although the sizes of I and P cylinders were highly asymmetric. Those structures have never been found for monodisperse ABC triblock terpolymers, and the three specific features have been confirmed: (1) I cylinders were metamorphosed into rod domains, and their interfaces have nonconstant mean curvatures; (2) the cross-sectional area ratio of I/P domain is qualitatively changed with the volume fraction of each component; and (3) spherical and cylindrical domains of P component coexist. The molecular design adopted in the present work, that is, I and P blocks in two parent terpolymers have both fairly large chain length difference, must lead to these new morphologies.