Creating Honeycomb Structures in Porous Polymers by Osmotic Transport.
Creating Honeycomb Structures in Porous Polymers by Osmotic Transport.
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DOI：
10.1002/cphc.201600834
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
Aggeliki Quell;S. Heitkam;W. Drenckhan;C. Stubenrauch
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文献类型：
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作者：
Aggeliki Quell;S. Heitkam;W. Drenckhan;C. Stubenrauch
了解为什么蜂窝是这样形成的，已经感动了生物学家，物理学家，化学家和数学家。直到最近，蜂窝“出生时”的形状才被纳入正在进行的讨论中：出生时，蜂窝是球形的，但随后转变为众所周知的六边形。有人提出，由表面张力效应驱动的蜡流是这种转变的原因。我们最近对具有蜂窝状结构的合成聚合物泡沫的研究指出了一种非常不同的机制。就像在蜂窝细胞中一样，我们观察到在聚合过程中球形的“初始状态”转变为六边形的“最终状态”。我们有实验证据表明，在聚合过程中出现的浓度梯度，其传输单体，使得球形模板成为具有均匀厚度的壁的蜂窝结构。有关这一机制的知识表明，有前途的战略，为开发具有优化的机械性能的轻质材料。
Understanding why honeycombs are shaped the way they are has moved biologists, physicists, chemists, and mathematicians alike. It was only recently that the honeycombs' shape "at birth" was included in the ongoing discussions: at birth, the cells are spherical but then transform into the well-known hexagons. It was proposed that a flow of wax-driven by surface tension effects-is the reason for this transformation. Our recent work on synthetic polymer foams with honeycomb-like structures points towards a very different mechanism. Just like in honeycomb cells, we observe that a spherical "initial state" transforms into a hexagon-shaped "final state" during polymerization. We have experimental evidence that a concentration gradient arises during polymerization, which transports monomers such that the spherical template becomes a honeycomb structure with walls of homogeneous thickness. The knowledge about this mechanism suggests promising strategies for the development of lightweight materials with optimized mechanical properties.