Diving into the Finestructure of Macroporous Polymer Foams Synthesized via Emulsion Templating: A Phase Diagram Study.
Diving into the Finestructure of Macroporous Polymer Foams Synthesized via Emulsion Templating: A Phase Diagram Study.
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DOI：
10.1021/acs.langmuir.6b03762
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Aggeliki Quell;T. Sottmann;C. Stubenrauch
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文献类型：
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作者：
Aggeliki Quell;T. Sottmann;C. Stubenrauch
在我们对乳液模板单分散聚合物泡沫的研究过程中，我们发现，如果引发位点改变，则精细结构会有显着差异。这促使我们研究液体模板的相行为。我们的研究表明，模板由三种不同长度尺度的液滴组成：通过微流体产生的水滴（约70 μm）被连续相包围，其中w/o乳液（≤100 nm）与w/o微乳液（约5 nm）共存。我们推测，w/o-乳液液滴作为种子的多孔finestructure中观察到的AIBN引发的聚合物泡沫。我们有实验证据表明，W/O型乳液转化为O/W型乳液进行聚合。这解释了在KPS引发的聚合物泡沫中观察到的粒状结构。精细结构的控制在定制聚合物泡沫的制备中是重要的，因为它直接影响材料的密度，从而反过来影响其机械稳定性。
During our studies on emulsion-templated monodisperse polymer foams we found significant differences in the finestructure if the locus of initiation is changed. This motivated us to study the phase behavior of the liquid template. Our studies indicate that the template consists of droplets of three different length scales: The water droplets generated via microfluidics (∼70 μm) are surrounded by a continuous phase in which a w/o emulsion (≤100 nm) coexists with a w/o microemulsion (∼5 nm). We speculate that the w/o-emulsion droplets act as seeds for the porous finestructure observed in AIBN-initiated polymer foams. We have experimental evidence that the w/o emulsion inverts to an o/w emulsion with progressing polymerization. This explains the granular texture observed in KPS-initiated polymer foams. The control of the finestructure is important in the preparation of tailor-made polymer foams because it directly impacts the material's density and thus, in turn, its mechanical stability.