Enlarged Phase Regions of Multi-Continuous 3D Network Nanostructures in ABC Triblock Copolymers.
Enlarged Phase Regions of Multi-Continuous 3D Network Nanostructures in ABC Triblock Copolymers.
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DOI：
10.1021/acs.langmuir.1c00856
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
Yan-Guang Zhang;Mingshuang Qian;Weiguo Hu;Yuci Xu
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文献类型：
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作者：
Yan-Guang Zhang;Mingshuang Qian;Weiguo Hu;Yuci Xu
为了增加三维（3D）多连续形貌的稳定区域，在智能传感器、气体分离膜和光子材料中具有巨大的应用潜力，本文根据ABC三嵌段共聚物的多连续纳米结构的曲率来控制其不同通道的嵌段比。在小体积分数A区，当fB/fC = 1/3时，多连续的旋转纳米结构是稳定的，而当B和C块体的体积分数相当时，可以得到两畴片层（LB/C）和三层片层（L3），这表明改变fB/fC比是形成多连续聚合物网络纳米结构的有效途径。有趣的是，在fB/fC = 4的条件下，发现了核壳陀螺和O70的大相区。改变比值扩大多连续纳米结构相域的机理可以归结为陀螺和O70纳米结构中曲率的存在。因此，形成的薄层必须与这些曲率一致，这些曲率可以通过调整块比来调节。所提出的机理和计算的相图可以有效地指导这些多连续纳米结构的实验观察。
Aiming to increase the stability region of three-dimensional (3D) multi-continuous morphologies due to great potential application in smart sensors, gas separation membranes, and photonic materials, in this paper, we control the block ratio of different channels of an ABC triblock copolymer according to the curvature of these multi-continuous nanostructures. In the small A volume fraction region, the multi-continuous gyroid nanostructure is stable when fB/fC equals 1/3, while two-domain lamellae (LB/C) and three-layer lamellae (L3) are obtained when B and C blocks have comparable volume fractions, suggesting that changing the fB/fC ratio is an effective way of forming multi-continuous polymer network nanostructures. Interestingly, a large phase region of the core-shell gyroid and O70 are found under the condition of fB/fC = 4. The mechanism of changing the ratio to enlarge the phase regimes of multi-continuous nanostructures can be ascribed to the existence of curvature in gyroid and O70 nanostructures. Therefore, the formed thin layer must be consistent with these curvatures, which can be tuned by the adjustment of the block ratio. The proposed mechanism and the calculated phase diagram can effectively guide the experimental observation of these multi-continuous nanostructures.