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Bridged polysilsequioxane adsorption materials containing phosphonic acid residues

  • Molecular and Supramolecular Structures at the Interfaces
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Abstract

Reactions of hydrolytic polycondensation of bis(triethoxysilane) [(C2H5O)3Si]2C2H4 (or [(C2H5O)3Si]2C6H4) and functional agent (C2H5O)3Si(CH2)2P(O)(OC2H5)2 (alkoxysilanes molar ratio of 2: 1 and 4: 1, fluoride ion catalyst and ethanol solvent) yielded powder-like xerogels that contained phosphonic acid residues in the surface layer. Their treatment with boiling concentrated hydrochloric acid resulted in transformation of functional groups ≡Si(CH2)2P(O)(OC2H5)2 into acid groups ≡Si(CH2)2P(O)(OH)2. The methods of IR, 1H MAS NMRm and 13C, 29Si, 31P MAS NMR spectroscopy showed the following (1) The surface layer in the initial xerogels contains not only phosphorus functional groups, but also some non-hydrolyzed ethoxysilyl groups as well as silanol groups. (2) The hydrochloric acid treatment of the initial xerogels causes the hydrolysis of not only ethoxy groups in the phosphonic acid residues, but also most residual ethoxysilyl groups. (3) Vacuum drying of xerogels after acid treatment forms ≡Si(CH2)2P(O)(OH)-OSi≡ links in their surface layer (not more than 20% of phosphorus-containing groups). (4) According to 29Si CP MAS NMR spectroscopic data, boiling acid treatment relatively enriches the xerogel structure T2 and T3 units and accounts for the higher rigidity of the hybrid framework. These units also account for retention of the porous structure in these xerogels over time, while most initial xerogels have porous structures that collapse in 12–18 months of storage. The acid-treated xerogels were attributed to microporous adsorbents (having specific surface area of 620 to 760 m2/g). According to the AFM data, both initial and acid-treated xerogels contain almost spherical aggregates of the primary particles (globules).

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Authors and Affiliations

  1. Chuiko Institute of Surface Chemistry, Ukrainian National Academy of Sciences, ul. Generala Naumova 17, Kiev, 03164, Ukraine

    I. V. Mel’nik, N. V. Stolyarchuk, O. A. Dudarko & Yu. L. Zub

  2. Faculty of Chemistry, University of Maria Curie-Sklodowska, pl. M. Curie-Sklodowskiej 3, Lublin, 20-031, Poland

    A. Dabrowski & M. Barczak

  3. Institute Charles Gerhardt — UMR 5253 (CNRS/ENSCM/UM2/UM1), 8 rue de I’Ecole Normale, 34296, Montpellier Cedex 5, France

    B. Alonso

Authors
  1. I. V. Mel’nik
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  2. N. V. Stolyarchuk
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  3. O. A. Dudarko
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  4. Yu. L. Zub
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  5. A. Dabrowski
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  6. M. Barczak
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  7. B. Alonso
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Correspondence to Yu. L. Zub.

Additional information

Original Russian Text © I. V. Mel’nik, N. V. Stolyarchuk, O. A. Dudarko, Yu. L. Zub, A. Dabrowski, M. Barczak, B. Alonso, 2010, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2010, Vol. 46, No. 2, pp. 174–182.

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Mel’nik, I.V., Stolyarchuk, N.V., Dudarko, O.A. et al. Bridged polysilsequioxane adsorption materials containing phosphonic acid residues. Prot Met Phys Chem Surf 46, 206–214 (2010). https://doi.org/10.1134/S2070205110020073

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  • DOI: https://doi.org/10.1134/S2070205110020073

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