聚酰胺胺改性纳米二氧化硅的研究进展

doi:10.11896/cldb.18070213

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Abstract Surface modification of nano-silica is an important way to solve nanometer powder agglomeration, it can not only improve the dispersibility of nano-silica in aqueous phase medium, but also improve its compatibility with organic phase. Therefore, surface modification of nano-silica has important theoretical significance and application value.
At present, the theoretical basis of powder modification mainly focuses on physical adsorption theory, chemical bond theory and coordination theory, etc. The commonly used nano-silica modifiers are ionic polymers (polyethylenimine, maleimide propyltrimethylammonium chloride, polysodium methacrylate, etc.), non-ionic polymers (polyurethane, etc.), and coupling agents (titanate coupling agent, silane coupling agent, etc.), and the modification methods include molecular self-assembly, grafting, chemical deposition, dry modification and wet modification, etc.
Poly(amide-amine) (PAMAM) has been extensively studied and utilized in many fields such as the preparation of nanoparticles, molecular carrier, catalyst and separation and purification of heavy metal ions because of its regular dendrimer structure, controllable molecular weight and multi-functional group, and high reactivity. Most of the modification strategies are conducted indirectly, that is, the -NH₂ group is firstly introduced onto the surface of SiO₂ powder, then PAMAM molecules are synthesized by means of polymerization. However, as silane fragments bonded by hydroxyl may break under the effect of stirring and heating (such as -CH₂-CH₂-), it is difficult to avoid the occurrence of side reactions in the synthesis process, and the molecular weight and length of the molecular chain of the synthetic products are difficult to control. As a result, the efficiency of this method is not high. Our group proposed to adopt PAMAM macromolecular to modify silica directly through dry modification method, which can avoid the participation of moisture, and the surface of silica retain more active points. The aim of modification can be achieved by directly coupling the modifier molecular PAMAM (central nuclear nitrogen atom, amide center, chain terminated amine group, etc.) with these active points on the surface of silicon dioxide to form ligand structure, at the same time, the modification process is simplified and the operating cost is reduced.
In this paper, the modification methods of PAMAM for silicon dioxide are introduced firstly, then the application of PAMAM modified silicon dio-xide is introduced emphatically from four aspects, including adsorption and separation of heavy metal ions, biotechnology, dispersibility in medium and coatings, and catalytic carriers in order to provide reference for the preparation of modified nano-silica with better performance and stability.

Key words： poly(amide-amine) nano silicon dioxide grafting technology density-functional theory dry modification

Published: 23 July 2019

CLC number:

O643

Fund:This work was financially supported by Shandong University of Science and Technology Research Fund (2014TDJH104).

About author:: Haifeng He, May 2006—August 2008, engaged in synthesis of biofunctional polymers and functional coa-tings as postdoctor at University of Southern Mississippi and Eastern Michigan University in USA. Since joining the Shandong University of Science and Technology in September 2008, he has been teaching the courses of “Principles and Technology of Plymer Processing”, “Polymer Composites”, “Polymer Synthesis Technology”and “Principle of Ppolymer Synthesis”as well as research on functional coatings, nano-powder modification, and plastics modifications. At present, 9 papers have been published in journals, and 4 patents granted.
Tao Jin, March 2017—March 2018, engaged in graphene modification and application research with senior visiting scholars at the Commonwealth Scientific and Industrial Research Organization of Australia. From December 2010 to November 2012, he worked on the theory of nano-powder modification in the post-doctoral mobile station of Materials Science and Engineering, Beijing University of Chemical Technology. Since joi-ning the Shandong University of Science and Technology in 2002, he has been teaching the courses of “Physical Chemistry” and “Material Thermodynamics”, as well as research on polymer synthesis, biomedical materials, nano-powder modification, and graphene application development. At present, 15 SCI papers have been published in journals, such as “Journal of Hazardous Materials,RSC Advances,Science and Technology of Advanced Materials, Progress in Organic Coating,Surface and Interface Analysis, Che-mistry Letters, Surface and Coatings Technology,Journal of Molecular Structure, Chinese Journal of Chemical Physics, International Journal of Quantum Chemistry”, and 4 patents granted, as well as manuscript review for multiple SCI journals.

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Cite this article:

HE Haifeng,KOU Xinxiu,LYU Hailiang, et al. Research Developments of Nano-silica Modified by Poly(amide-amine)[J]. Materials Reports, 2019, 33(17): 2882-2889.

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http://www.mater-rep.com/EN/10.11896/cldb.18070213 OR http://www.mater-rep.com/EN/Y2019/V33/I17/2882

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