How the Locus of Initiation Influences the Morphology and the Pore Connectivity of a Monodisperse Polymer Foam
How the Locus of Initiation Influences the Morphology and the Pore Connectivity of a Monodisperse Polymer Foam
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DOI：
10.1021/acs.macromol.6b00494
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发表时间：
2016-07
期刊：
影响因子：
5.5
通讯作者：
Aggeliki Quell;Benedetta de Bergolis;W. Drenckhan;C. Stubenrauch
中科院分区：
文献类型：
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作者：
Aggeliki Quell;Benedetta de Bergolis;W. Drenckhan;C. Stubenrauch
聚合物泡沫的性能与材料的多孔结构密切相关：两个最具决定性的参数是孔隙的互联性和孔壁的厚度。尽管这些参数至关重要，但仍然缺乏对控制壁厚和孔径的过程的深入了解。我们通过使用微流控芯片实验室技术研究乳液模板生成的单分散、高度有序的聚合物泡沫来解决这些问题。我们探讨了不同工艺参数的影响，并表明最关键的参数是聚合开始的位置。如果起始是在连续的单体基质中开始的，那么液体模板的形态就会被“冻结”，在邻近的液滴被薄膜隔开的地方会出现孔洞。然而，如果起始点在界面处，不仅孔隙保持封闭，而且我们还证明了一种迄今为止无法解释的机制。
The properties of polymer foams are tightly linked to the porous structure of the material: two of the most decisive parameters are the interconnectivity of the pores and the thickness of the pore walls. Despite the vital importance of these parameters, a deep understanding of the processes that control the wall thickness and the pore opening is still lacking. We tackle these questions by studying monodisperse, highly ordered polymer foams which are generated via emulsion templating using microfluidic lab-on-a-chip techniques. We explore the influence of different processing parameters, and we show that the most crucial parameter is the locus where the polymerization is initiated. If initiation starts within the continuous monomer matrix, the morphology of the liquid template is “frozen in” with pore openings arising where neighboring drops are separated by thin films. However, if the locus of initiation is at the interface, not only do the pores remain closed, but we evidence a hitherto unexplained mecha...