Abstract
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.
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Acknowledgements
Authors thank the financial support of CIQA (project 6245). H.I. Melendez-Ortiz, and G. Castruita-de Leon are particularly grateful to the program Cátedras-CONACyT (Mexico). Also, we thank to E. Díaz, and H. Saade from CIQA for the TEM, and nitrogen adsorption–desorption studies respectively, and S. Garcia and J.A. Mercado-Silva for their technical assistance.
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Meléndez-Ortiz, H.I., Puente-Urbina, B., Castruita-de Leon, G. et al. Covalent grafting of polyacrylamide onto mesoporous MCM-41 silica via free radical polymerization. J Porous Mater 24, 1527–1533 (2017). https://doi.org/10.1007/s10934-017-0392-3
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DOI: https://doi.org/10.1007/s10934-017-0392-3