In this work, a new approach for the modification of mesocellular silica foam (MCF) with poly(allylamine hydrochloride) (PAH) through free radical polymerization of the respective monomer is reported. The modification route involved the functionalization of MCF with vinyltrimethoxysilane as first step followed by the free radical copolymerization of the grafted organosilane-coupling agent with the monomer allylamine hydrochloride (AA⋅HCl). As far as we know, this is the first report about the covalent modification of ordered-mesostructure silica with PAH by free radical polymerization of AA⋅HCl. Several parameters of polymerization reaction such as initiator and monomer concentrations, and reaction time were varied in order to tune the content of PAH in the obtained hybrid material MCF–PAH. Grafting was corroborated by infrared spectroscopy and X-ray photoelectron spectroscopy while the polymer content was determined by thermogravimetric analysis. The polymer content could be tuned from 12 to 42% without modification in the MCF structure as confirmed by small angle X-ray scattering, scanning electron microscopy, and transmission electron microscopy. Textural properties of MCF such as pore volume and BET surface decreased as the PAH content increased which confirmed the grafting of this polymer onto silica. The resulting silica composites could find application as gas adsorbents, drug delivery systems, and recovery of heavy metals from wastewater.

在这项工作中，报道了通过相应单体的自由基聚合用聚（烯丙胺盐酸盐）（PAH）改性介孔二氧化硅泡沫（MCF）的新方法。改性途径包括第一步，用乙烯基三甲氧基硅烷将MCF功能化，然后将接枝的有机硅烷偶联剂与单体烯丙胺盐酸盐（AA·HCl）进行自由基共聚。据我们所知，这是有关通过AA·HCl自由基聚合用PAH对有序介孔结构二氧化硅进行共价改性的第一个报道。改变聚合反应的一些参数，例如引发剂和单体的浓度以及反应时间，以调节所得杂化材料MCF-PAH中PAH的含量。通过红外光谱和X射线光电子能谱证实了接枝，同时通过热重分析确定了聚合物含量。如小角度X射线散射，扫描电子显微镜和透射电子显微镜所证实的，可以将MCF结构中的聚合物含量从12％调节至42％而没有改变。随着PAH含量的增加，MCF的质地特性（例如孔体积和BET表面）降低，这证实了该聚合物接枝到二氧化硅上。所得的二氧化硅复合材料可以用作气体吸附剂，药物递送系统以及从废水中回收重金属。如小角度X射线散射，扫描电子显微镜和透射电子显微镜所证实的，可以将MCF结构中的聚合物含量从12％调节至42％而没有改变。随着PAH含量的增加，MCF的质地特性（例如孔体积和BET表面）降低，这证实了该聚合物接枝到二氧化硅上。所得的二氧化硅复合材料可以用作气体吸附剂，药物递送系统以及从废水中回收重金属。如小角度X射线散射，扫描电子显微镜和透射电子显微镜所证实的，可以将MCF结构中的聚合物含量从12％调节至42％而没有改变。随着PAH含量的增加，MCF的质地特性（例如孔体积和BET表面）降低，这证实了该聚合物接枝到二氧化硅上。所得的二氧化硅复合材料可以用作气体吸附剂，药物递送系统以及从废水中回收重金属。