Tricontinuous Double Diamond Network Structure from Binary Blends of ABC Triblock Terpolymers
Tricontinuous Double Diamond Network Structure from Binary Blends of ABC Triblock Terpolymers
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DOI：
10.1021/acs.macromol.7b00403
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发表时间：
2017-07-25
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;Suzuki, Jiro;Matsushita, Yushu
我们报道了ABC三嵌段三元共聚物的二元共混物中的三连续双金刚石（TDD）结构，其中两个末端嵌段的链长不同。尽管如此，TDD结构长期以来一直被认为是不稳定相，这是因为与拉伸能和界面能相关的高能势垒，这是由于比已知结构如层状结构或三连续双螺旋（TDG）结构的界面面积更宽的界面面积。不同的链长可能有助于减轻自由能损失，这导致TDD在宽范围的组成下作为稳定相出现。透射电子显微镜（TEM），小角X射线散射（SAXS），和TEM断层扫描（TEMT）的结果都证实了TDD在本发明的共混体系中的存在。我们提出了第一个坚实的证据，物理稳定的TDD结构。
We report the tricontinuous double diamond (TDD) structure in binary blends of ABC triblock terpolymers with different chain lengths of the two end-blocks. Although, the TDD structure has been long considered as an unstable phase because of the high energetic barrier associated with stretching energy and interfacial energy due to wider interfacial area than those for known structures such as a lamellar structure or a tricontinuous double gyroid (TDG) structure. The different chain length possibly helps to alleviate the free energy penalty, which resulted in the occurrence of the TDD as a stable phase at wide range of compositions. Transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and TEM tomography (TEMT) results all corroborate the existence of TDD in the present blend system. We present the first solid evidence of the thermodynamically stable TDD structure.