Grafting of selected presynthesized macromonomers onto various dispersions of silica particles
Grafting of selected presynthesized macromonomers onto various dispersions of silica particles
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DOI：
10.1002/app.10726
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发表时间：
2002-08-08
影响因子：
3
通讯作者：
D'Amore, A
中科院分区：
文献类型：
--
作者：
Sartore, L;Penco, M;D'Amore, A
开发了一种新的方法，该方法使人们能够获得具有高重金属离子络合能力的表面改性二氧化硅。合成方法是基于乙烯基封端的大分子单体通过共价键合接枝到二氧化硅上。适当选择大分子单体结构、分子量和分子量分布可以获得具有一系列所需性能的材料。该方法已在二氧化硅颗粒和两种结构相关的大分子单体的各种分散体（范围从35和200 μ m）上进行了测试。通过红外光谱、扫描电镜、接枝率（元素分析和煅烧）、密度（氦比重瓶法）、比表面积（BET法）和孔径（气体吸附和压汞法）测量对天然二氧化硅和所得有机-无机混合产物进行了充分表征。结果发现，相应的聚合物被有效地接枝到表面上;二氧化硅颗粒的密度、表面积和孔径随着聚合物接枝而减小。对金属离子吸附的初步结果表明，聚合物接枝二氧化硅表现出优异的络合能力。(C)2002 Wiley Periodicals，Inc.
A new process was developed which enables one to obtain surface-modified silica with a high heavy metal ion complexing ability. The synthetic approach is based on grafting of vinyl-terminated macromonomers onto silica via covalent bonding. A proper selection of the macromonomer structure, molecular weight, and molecular weight distribution allows materials to be obtained with a range of desirable properties. The process has been tested on various dispersions (ranging from 35 and 200 pm) of silica particles and two structurally related macromonomers. Native silica and the resulting mixed organic-inorganic products were fully characterized by IR spectroscopy, SEM, yield of grafting (elemental analysis and calcination), density (helium pycnometry), specific surface area (BET method), and pore size (gas adsorption and mercury porosimetry) measurements. It was found that the corresponding polymers are effectively grafted onto the surface; the density, surface area, and pore size of the silica particles decrease with polymer grafting. Preliminary results on metal-ion uptake indicate that polymer-grafted silica exhibits an excellent complexing ability. (C) 2002 Wiley Periodicals, Inc.