Abstract

Highly porous polymer materials with preset pore sizes and porosities can be prepared via polymerization of dispersion media of highly concentrated water-in-oil emulsions. In this work, the effect of divinylbenzene concentration in styrene–divinylbenzene mixed dispersion media of highly concentrated emulsions on the emulsion stability and the structure of resulting polymer materials has been investigated. It has been found that the emulsion stability at 25 and 65°C decreases with an increase in divinylbenzene concentration. Therewith, the pore size in the polymer material slightly grows from 4.0 to 4.5 μm. Emulsion stability expectedly rises with the concentration of a surfactant (Span 80). It has been shown that concentrations of divinylbenzene and Span 80 equal to 10 vol % are optimal for obtaining highly porous polymers from emulsions containing ammonium peroxodisulfate as a polymerization initiator. When emulsions containing benzoyl peroxide as a polymerization initiator are used to obtain highly porous polymers, NaCl (0.02–0.03 wt %) should be added to the dispersed phase of the emulsions. In this case, emulsion stability increases due to a decrease in the Ostwald ripening rate. Accordingly, highly porous polymers with smaller pores are obtained.

中文翻译：

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含苯乙烯-二乙烯基苯混合物的高浓度乳液稳定性对基于其形成的高多孔共聚物结构的影响

摘要

可以通过聚合高浓度油包水型乳液的分散介质来制备具有预定孔径和孔隙率的高度多孔聚合物材料。在这项工作中，已经研究了高浓度乳液在苯乙烯-二乙烯苯混合分散介质中二乙烯苯浓度对乳液稳定性和所得聚合物材料结构的影响。已经发现，随着二乙烯基苯浓度的增加，乳液在25℃和65℃下的稳定性降低。由此，聚合物材料中的孔径从4.0μm微增至4.5μm。随着表面活性剂浓度的增加，乳液的稳定性有望提高（Span 80）。已经表明，对于从包含过二硫酸铵作为聚合引发剂的乳液中获得高度多孔的聚合物而言，二乙烯基苯和Span 80的浓度等于10体积％是最佳的。当使用含有过氧化苯甲酰作为聚合引发剂的乳液来获得高度多孔的聚合物时，应将NaCl（0.02–0.03 wt％）添加到乳液的分散相中。在这种情况下，乳液稳定性由于奥斯特瓦尔德熟化速率的降低而增加。因此，获得具有较小孔的高度多孔的聚合物。乳液稳定性的提高归因于奥斯特瓦尔德熟化速率的降低。因此，获得具有较小孔的高度多孔的聚合物。乳液稳定性的提高归因于奥斯特瓦尔德熟化速率的降低。因此，获得具有较小孔的高度多孔的聚合物。