Effects of internal-phase contents on porous polymers prepared by a high-internal-phase emulsion method
Effects of internal-phase contents on porous polymers prepared by a high-internal-phase emulsion method
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内相含量对高内相乳液法制备多孔聚合物的影响
DOI：
10.1007/s10965-014-0524-2
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发表时间：
2014-08
影响因子：
2.8
通讯作者：
Fa-Ai Zhang
中科院分区：
文献类型：
--
作者：
Wang-Fa Xu;Rui Bai;Fa-Ai Zhang
以高内相乳液(HIPES)为模板，十六烷基三甲基溴化铵为表面活性剂，在水相有机添加剂乙醇存在下，以9：1(v/v)的苯乙烯/二乙烯基苯为模板聚合合成了一系列多孔聚合物聚(苯乙烯-二乙烯基苯)，内相含量在82.5~94.0%之间。用扫描电子显微镜和压汞压力仪表征了内相含量对聚合物微观结构的影响。考察了不同孔隙率的聚合物的表观密度、压缩强度、吸水和甲苯的吸收与释放行为。结果表明，内相含量对多孔聚合物的性能有较大影响。随着内相含量的增加，多孔聚合物的孔体积增大，吸水值和吸水值增加，表观密度和抗压强度降低。内相含量最高(94.0%)的样品吸水率和甲苯吸水率最高，分别达到11.65和21.64×cm3/g(以多孔聚合物的重量计)。多孔聚合物的吸水动力学和甲苯吸水动力学均符合准二级动力学模型。多孔聚合物的甲苯释放率随内相含量的增加而增加。
A series of porous polymers poly(styrene-divinylbenzene) was synthesized by the polymerization of 9 : 1 (v/v) styrene/divinylbenzene using high-internal-phase emulsions (HIPEs) as template, cetyltrimethyl ammonium bromide as a surfactant in the presence of water-miscible organic additives ethanol, with internal-phase contents varied from 82.5 to 94.0 %. The effects of the internal-phase contents on the microstructure of the resulting polymers were characterized by scanning electron microscopy and mercury intrusion porosimeter. The apparent density, compressive strength, water and toluene absorption and release behavior of the polymers with different porosity were investigated. The results showed that the properties of the porous polymer were significantly influenced by the internal-phase content. The increase in the internal-phase content increased the pore volume, thus increased the water and toluene absorption values, but decreased the apparent densities and the compressive strength of the porous polymers. The highest water and toluene absorption values were found for the sample prepared with the highest internal-phase content (94.0 %), which reached 11.65 and 21.64 cm3/g (based on the weight of the porous polymer), respectively. The water and toluene absorption kinetics of the porous polymers were well described by a pseudo-second-order kinetic model. The toluene release rates of the porous polymers were increased with the increased internal-phase content.
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