Polymer/silica composite of core–shell type by polymer swelling in TEOS

Kierys, Agnieszka; Dziadosz, Marek; Goworek, J.

doi:10.1016/j.jcis.2010.05.049

Cited by 35 publications

(25 citation statements)

References 43 publications

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“…At the absence of surfactant, as in our previous experiment, the tetraethoxysilane entrapped in polymer pores was transformed into SiO 2 inside particles without transfer into solution (Kierys et al 2010). There was no evidence of silica particles formation in the bulk solution, suggesting that the whole silica source is entrapped within polymer pores.…”

Section: Introductionsupporting

confidence: 76%

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Synthesis of the mesostructured polymer-silica composite and silicon dioxide through polymer swelling in silica precursor

2016

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Tetrabutoxysilane (TBOS) transition introduced into the preformed porous polymer was found as an effective method in the preparation of highly porous silica adsorbents. The swelling of the acrylic polymer XAD7HP in TBOS causes the total infiltration of polymer beads by the silica precursor. Transformation of TBOS in aqueous solution at presence of the surfactant (hexadecyltrimethylammonium bromide, CTAB) produces two composite phases: silica-polymer beads and fine silica-CTAB particles. After their calcination, two pure silica phases exhibiting extremely high porosity were obtained. The paper presents the structural properties of the composites and silica materials. All materials were characterized by scanning and transmission electron microscopy (SEM and TEM), the low temperature nitrogen adsorption, X-ray diffraction (XRD) and 29 Si NMR spectroscopy.

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Section: Introductionsupporting

confidence: 76%

“…Recently, we used a substantially different supplying of the silica source into the reacting mixture (Kierys et al 2010, Krasucka et al 2015. The approach depends on the initial entrapment of tetraalkoxysilane (TEOS) in porous polymer particles followed by transformation of TEOS into silica in aqueous solution of desired pH.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of the mesostructured polymer-silica composite and silicon dioxide through polymer swelling in silica precursor

2016

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“…These materials are widely used as sorbents [11], ionites [12] and organic frameworks for composite synthesis [13]. Their insolubility and resistance to both acids and bases, along with their high sorption capacity, makes them very versatile materials.…”

Section: Introductionmentioning

confidence: 99%

Swelling effects in cross-linked polymers by thermogravimetry

Sienkiewicz

Krasucka

Charmas

et al. 2017

J Therm Anal Calorim

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The present study focuses on the mechanism of swelling and evaluates interactions between solvents of different chemical characters (polar-ethanol, nonpolarn-heptane) and commercially available porous Amberlite polymers (XAD4, XAD16, XAD7HP) by temperatureprogrammed desorption (TPD). The first two polymers are the product of copolymerization of styrene and divinylbenzene. Despite having the same chemical composition, they differ in pore size and volume. The Amberlite XAD7HP is composed of an acrylic matrix and has lower pore volume and specific surface area than XAD16 and XAD4. All three resins have the ability to swell, though the per cent of polymeric network expansion during this process varies depending on the solvent used (e.g. in tetraethyl orthosilicate, XAD4 and XAD16 spherical particles increase in volume by 20-30%, while XAD7HP particles can expand by more than 120%). The TPD experiment was performed in dynamic linear and quasistatic heating mode. Based on thermogravimetric data, the desorption energy of selected liquids and pore size distribution in the swollen state were estimated. The obtained results are discussed in terms of both mathematical modelling and low-temperature nitrogen adsorption-desorption experiment.

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“…It occurs in various natural and artificial shapes and forms [1][2][3][4][5]. Due to its adsorptive properties, heat resistance and environmental friendly character the most interesting silica species are the porous one.…”

Section: Introductionmentioning

confidence: 99%

Porosity of Silica Monoliths with Tailored Mesopores of Ink-Bottle Shape Determined by Nitrogen Adsorption and Positron Annihilation Lifetime Spectroscopy

et al. 2017

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The comparison of pore size distributions obtained with the use of two porosimetric methods: low temperature nitrogen sorption (LN2) and positron annihilation lifetime spectroscopy (PALS), was performed for porous silica monoliths. Four investigated samples were prepared under various synthesis conditions. Nitrogen sorption showed the presence of bottle-shaped pores in all investigated samples. In addition, it seems that the presence of methanol during synthesis influences porosity to a greater extent than organic additives. Quite good agreement between the LN2 and PALS results was observed only for the silica monolith synthesized with β-cyclodextrins as pore directing agent. The biggest discrepancy in the results obtained from these two techniques was observed for the silica gel synthesized with no additives. The origin of such discrepancies, taking into account the shape of pore size distribution and deficiencies of data analysis techniques, is discussed.

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Polymer/silica composite of core–shell type by polymer swelling in TEOS

Cited by 35 publications

References 43 publications

Synthesis of the mesostructured polymer-silica composite and silicon dioxide through polymer swelling in silica precursor

Synthesis of the mesostructured polymer-silica composite and silicon dioxide through polymer swelling in silica precursor

Swelling effects in cross-linked polymers by thermogravimetry

Porosity of Silica Monoliths with Tailored Mesopores of Ink-Bottle Shape Determined by Nitrogen Adsorption and Positron Annihilation Lifetime Spectroscopy

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