三维有序大孔杂化SiO2的制备、表征及应用

将有机-无机杂化功能材料与有序大孔材料独特的有序开孔结构相结合,在制备的三维有序大孔二氧化硅(3DOM Si O2)孔壁上可控接枝带有功能基团的聚合物链段,制备3DOM杂化材料。采用表面引发原子转移自由基(SI-ATRP)接枝技术在3DOM Si O2孔壁上可控接枝聚甲基丙烯酸缩水甘油酯(PGMA)链段,讨论了接枝条件对接枝量及接枝链段分子量的影响,并利用FTIR、SEM、TGA、GPC等对接枝过程进行了表征。PGMA接枝链段上环氧基团可进一步与亲核试剂(二乙醇胺,浓硫酸和二乙烯三胺)发生开环反应,得到一系列带有不同官能团的具有较高接枝密度的功能杂化多孔材料,同时,利用该种材料对水中的水杨酸进行了吸附实验,吸附结果表明经二乙烯三胺开环后得到的功能化多孔材料对水杨酸具有很高的吸附量。

Three-Dimensionally Ordered Hybrid Macroporous SiO2: Preparation, Characterization and Application

Three-dimensionally ordered macroporous SiO₂ (3DOM SiO₂) with pore size of 250 nm was fabricated using the polystyrene colloidal crystal as template. The poly (glycidyl methacrylate) (PGMA) chains were grafted from the pore wall of 3DOM SiO₂ by surface-initiated atom transfer radical polymerization technique (SI-ATRP). SEM micrographs indicated that the hybrid 3DOM materials were arranged in highly ordered fashion. TGA and GPC results revealed the grafted amount/molecular weight could be controlled by simply changing the SI-ATRP reaction time. Moreover, epoxy groups which introduced onto the pore wall of 3DOM SiO₂ were carried out ring-opening reaction by nucleophile reagent. Subsequently, the epoxy groups were opened via further reactions. 3DOM hybrid SiO₂ with different functional groups were prepared, which were confirmed by FT-IR. Furthermore, the 3DOM hybrid SiO₂ functionalized with different functional groups were used as a adsorbent to removal salicylic acid from water. 3DOM SiO₂-g-PGMA-DETA gained by ring-opening reaction of diethylenetriamine presented high adsorption capacity.