Covalent grafting of polyacrylamide onto mesoporous MCM-41 silica via free radical polymerization
| Autor: | H. Iván Meléndez-Ortiz, E.M. Saucedo-Salazar, Bertha Puente-Urbina, Griselda Castruita-de León, Carlos Gallardo-Vega |
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| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Materials science Scanning electron microscope Mechanical Engineering Radical polymerization Polyacrylamide Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound MCM-41 chemistry Chemical engineering Mechanics of Materials Transmission electron microscopy Polymer chemistry General Materials Science 0210 nano-technology Mesoporous material |
| Zdroj: | Journal of Porous Materials. 24:1527-1533 |
| ISSN: | 1573-4854 1380-2224 |
| DOI: | 10.1007/s10934-017-0392-3 |
| Popis: | MCM-41 mesoporous silicas were covalently modified with polyacrylamide (PAAm) by a novel grafting strategy. The effect of various parameters such as monomer concentration, reaction time, and temperature on the content of PAAm onto MCM-41 silicas were studied. Modified silicas were characterized by X-ray diffraction (XRD), infrared spectroscopy, FT-IR, thermogravimetric analysis, nitrogen adsorption–desorption analyses, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy which confirmed the grafting process. According to XRD, SEM and TEM results, PAAm-modified MCM-41 silica did not show changes in its morphology and mesostructure by comparing with pristine MCM-41. Nitrogen adsorption–desorption studies showed that the attaching of PAAm onto MCM-41 silica decreased the values of pore size, pore volume and surface area. |
| Databáze: | OpenAIRE |
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