Topological defects in tubular network block copolymers
Topological defects in tubular network block copolymers
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DOI：
10.1016/j.polymer.2019.01.085
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发表时间：
2019-04-02
期刊：
影响因子：
4.6
通讯作者：
Thomas, Edwin L.
中科院分区：
文献类型：
--
作者：
Feng, Xueyan;Guo, Hua;Thomas, Edwin L.
由于独特的3D网络结构，基于双螺旋多连续管状结构的材料可以表现出奇异的性能。互穿陀螺网络中存在的拓扑缺陷的性质、频率和对各种物理性质的潜在影响是一个悬而未决的问题。我们检查了具有双螺旋形态的聚苯乙烯-聚二甲基硅氧烷二嵌段共聚物，以识别和分类存在的拓扑缺陷类型。通过顺序离子束铣削和低压电子束成像进行大体积重建。发现了不同类型的局部点状拓扑缺陷，包括节点功能缺陷、网络断裂和网络间接头（桥）以及两种类型的网络内环路缺陷。这种拓扑缺陷将影响具有陀螺仪结构的材料的从电荷和质量传输到波传播和带隙以及电池性能的各种特性。
Materials based on the double gyroid multicontinuous tubular structure can exhibit exotic properties due to the unique 3D network structure. The nature, frequency and potential influence of topological defects present in the interpenetrating gyroid networks on various physical properties is an open question. We examined a polystyrene - polydimethylsiloxane diblock copolymer possessing the double gyroid morphology in order to identify and classify the types of topological defects present. The large volume reconstructions were made by sequentially ion beam milling and low voltage electron beam imaging. Different types of local point-like topological defects were found including node functionality defects, network breaks and network-network joints (bridges) as well as two types of intra-network loop defects. Such topological defects will influence properties ranging from charge and mass transport, to wave propagation and band gaps, and battery performance in materials with the gyroid structure.