Surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) was employed for controlled grafting of poly(glycidyl methacrylate) (PGMA) and poly(glycidyl methacrylate)-b-poly(methyl methacrylate) (PGMA-PMMA) brushes from mesoporous silica SBA-15. Initiator 2-bromoisobutyryl bromide (BiBB) was immobilized onto the inner surface of SBA-15 by reaction with free silanol groups. The polymerizations were conducted in the mixed solvents cyclohexanone /N, N-dimethylformamide. The strategy of utilizing mixed solvents gave rise to a suitable polymerization rate and resulted in a good control of the PGMA growth within the SBA-15 framework and could obtain polymer chains with well-preserved chain end functionality. Molecular weight of grafted polymer, structure, morphology, and composition of the functionalized SBA-15 were characterized by using gel permeation chromatography (GPC), X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), N₂ adsorption/desorption measurements, fourier transform infrared spectroscope (FT-IR), and thermogravimetry analysis (TGA), respectively. The thickness, polymer grafting density and molecular weight of the grafted polymer can be controlled by adjusting the polymerization time. The deactivator cannot efficient diffuse to convert the propagating chains to the dormant species when the pores are nearly completely filled with the polymer, therefore, increasing grafting density resulted in higher molecular weight and polydispersity index (PDI) values for the grafted polymer chains. This work provides a facile route for preparation of well-defined mesoporous silica/polymer hybrids.

通过电子转移原子转移自由基聚合（ARGET ATRP）再生的表面引发的活化剂用于聚甲基丙烯酸缩水甘油酯（PGMA）和聚甲基丙烯酸缩水甘油酯-b-聚甲基丙烯酸甲酯（PGMA-PMMA）刷的控制接枝由介孔二氧化硅SBA-15制成。通过与游离硅烷醇基团反应，将引发剂2-溴异丁酰溴（BiBB）固定在SBA-15的内表面上。聚合在混合溶剂环己酮/ N，N-二甲基甲酰胺中进行。利用混合溶剂的策略产生了合适的聚合速率，并导致对SBA-15框架内PGMA生长的良好控制，并且可以获得具有良好保留的链端官能度的聚合物链。接枝聚合物的分子量，结构，形态，_{分别进行2种}吸附/解吸测量，傅立叶变换红外光谱仪（FT-IR）和热重分析（TGA）。可以通过调节聚合时间来控制接枝聚合物的厚度，聚合物接枝密度和分子量。当孔几乎完全用聚合物填充时，钝化剂无法有效地扩散，以将传播链转化为休眠物种，因此，接枝密度的提高导致接枝聚合物链的分子量和多分散指数（PDI）值更高。这项工作为制备定义明确的介孔二氧化硅/聚合物杂化物提供了一条简便的途径。