The creation of nanostructured materials with a triply periodic minimal surface (TPMS), defined as a zero mean curvature surface having periodicity in three-dimensional space, is an emerging solution to optimize transport (i.e., the ion-conductivity and hydraulic permeability) through the next-generation of electrolyte and ultrafiltration (UF) membranes. Here, we used an amphiphilic ABC-type block copolymer (BCP) (namely, polystyrene-block-poly(2-vinylpyridine)-block-poly(ethylene oxide) (PS-b-P2VP-b-PEO)) to generate symmetric thick films (~8 μm) composed entirely of a TPMS-based structure, consisting of a PS matrix with a double gyroid (DG) minimal surface and hydrophilic stimuli-responsive (P2VP/PEO) nanochannels. To produce the core/shell DG-structured monoliths, we used a process combining the nonsolvent-induced phase separation (NIPS) process with a solvent vapor annealing (SVA) treatment. From such symmetric ABC-type BCP-thick films generated by NIPS-SVA, a mean hydraulic permeability as high as 514 L h^-1 m^-2 bar^-1 was measured. This mean value was revealed to be nearly equal to that of asymmetric PS-b-P2VP-b-PEO membranes manufactured by NIPS, which have a substructure with an implicit irregular and random distribution of the internal pore structure and a skin layer with P2VP/PEO nanopores arranged into a hexagonal array.

中文翻译：

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ABC 三嵌段三元共聚物厚膜的纳米孔双螺旋结构

具有三周期最小表面（TPMS）的纳米结构材料的创建，被定义为在三维空间中具有周期性的零平均曲率表面，是一种新兴的解决方案，通过下一代电解质和超滤（UF）膜。在这里，我们使用两亲性ABC型嵌段共聚物（BCP）（即聚苯乙烯-嵌段-聚（2-乙烯基吡啶）-嵌段-聚（环氧乙烷）（PS- b -P2VP- b -PEO））来生成对称厚膜（~  8μm) 完全由基于 TPMS 的结构组成，由具有双螺旋 (DG) 最小表面的 PS 矩阵和亲水刺激响应 (P2VP/PEO) 纳米通道组成。为了生产核/壳 DG 结构整体，我们采用了将非溶剂诱导相分离 (NIPS) 工艺与溶剂蒸气退火 (SVA) 处理相结合的工艺。从由NIPS-SVA产生的这种对称ABC型BCP厚膜，测量到高达514L h ^-1  m ^-2  bar ^{-1的平均水力渗透率。}该平均值几乎等于不对称 PS- b -P2VP- b的平均值-由NIPS制造的PEO膜，其具有隐式不规则且随机分布的内部孔结构的子结构和具有排列成六边形阵列的P2VP/PEO纳米孔的表层。