Modification of porous silica particles with poly(acrylic acid)

Suzuki, Kazuya; Siddiqui, Shariq; Chappell, C. R.; Siddiqui, Junaid A.; Ottenbrite, Raphael M.

doi:10.1002/(sici)1099-1581(200002)11:2<92::aid-pat941>3.0.co;2-w

Cited by 43 publications

(31 citation statements)

References 8 publications

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“…The APS functionalized glass bead surfaces were modi ed with poly(acrylic acid) as illustrated in Scheme 2. J. T. Koch et al [14] had reported that carboxyl and amine groups react chemically with one another at 200 ± C. In our work, it was found that when the carboxyl and amine functional groups on poly(acrylic acid) and APS, respectively, were heated in DMF at 120-140 ± C amide bonds readily formed.…”

Section: Surface Modi Cation Of Glass Beads With Aps and Poly(acrylicsupporting

confidence: 52%

“…After the sample was completely wetted and liquid penetration ceased the measurement was terminated. Since the method is very sensitive to the sample packing conditions, care was taken to use identical amounts of samples that were then slightly compressed in the sample holder to constant volumeas recommended [14]. The porosity of the sample was calculated from the amount of liquid that penetrated into the sample using the formula:…”

Section: Measurement Of Surface Tension Contact Angle and Porositymentioning

confidence: 99%

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Effects of surface modification of glass beads with poly(acrylic acid)

Zengin¹,

Hu²,

Siddiqui³

et al. 2002

Designed Monomers and Polymers

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Etched glass beads were functionalized with 3-aminopropyltriethoxysi lane (APS) and glycidoxypropyltrimethoxysilane (GPS). The surface of glass beads were further modi ed with poly(acrylic acid) by reacting the carboxyl groups on poly(acrylic acid) with the amino groups of the grafted aminopropyltriethoxysil ane. The modi cations were characterized by FT-IR spectroscopy and tensiometry for contact angle and porosity measurements. Five different molecular weight PAA polymers ranging from 2,000 to 3,000,000 were grafted with less than expected increase of grafting% with molecular weight. The amount of poly(acrylic acid) (PAA) on the surface was determined from thermal gravimetric analysis and elemental analysis data. The surface properties of surface modi ed glass beads were determined by measuring water and hexane penetration rate and contact angle. The surface morphology was examined by scanning electron microscopy.

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Section: Surface Modi Cation Of Glass Beads With Aps and Poly(acrylicsupporting

confidence: 52%

Section: Measurement Of Surface Tension Contact Angle and Porositymentioning

confidence: 99%

Effects of surface modification of glass beads with poly(acrylic acid)

Zengin¹,

Hu²,

Siddiqui³

et al. 2002

Designed Monomers and Polymers

Self Cite

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“…Silane coupling agents that converts hydrophilic silica into rubber‐philic are widely used in the dry rubber industry . The other reported novel techniques for modifying the surface of silica are in situ graft polymerization, admicellar polymerization and modification via macromolecular coupling agents …”

Section: Introductionmentioning

confidence: 99%

Contribution of hydrogen and/or covalent bonds on reinforcement of natural rubber latex films with surface modified silica

Somaratne

Liyanage

Walpalage

2014

J of Applied Polymer Sci

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A macromolecular coupling agent containing hydrophilic and hydrophobic groups is made to react with precipitated silica. Interfacial interactions between OH groups of silica and COOH groups of macromolecule are found to be created through either hydrogen bonds alone or through hydrogen bonds and covalent bonds. Aqueous dispersions of unmodified and modified silica are prepared and the colloidal stability and particle size distribution of the dispersions are observed. The dispersions at neutral pH are incorporated into vulcanized/unvulcanized natural rubber latex. The formation of hydrogen bonds and/or covalent bonds is studied via FTIR spectroscopy and their contribution in encouraging filler‐rubber interactions is emphasized through mechanical and swelling properties. Uniform distribution and dispersion of modified filler particles throughout the rubber matrix is confirmed by the microstructures of the latex films cast from filler added natural rubber latex. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40380.

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“…Lead nitrate [Pb(NO 3 ) 2 ·6H 2 O] used in adsorption experiments was purchased from Shanghai Chemical Reagents Co. China. In order to improve the metal ion adsorption capacity, silica was modified by the amination reaction using the method as described in the literature [16,17]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Ion-imprinted poly(2-acrylamido-2-methyl-1-propansulfonic acid)/modified silica composite hydrogel for selective and enhanced adsorption of Pb(II) ions

Wang

2014

Desalination and Water Treatment

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To cite this article: Jingjing Wang & Xianning Li (2014) Ion-imprinted poly(2-acrylamido-2-methyl-1-propansulfonic acid)/ modified silica composite hydrogel for selective and enhanced adsorption of Pb(II) ions, Desalination and Water Treatment, 52:1-3, 274-282, A B S T R A C TIn this research, ion-imprinted poly(2-acrylamido-2-methyl-1-propansulfonic acid)/modified silica composite hydrogels were prepared using Pb(II) ions as template by in situ free-radical polymerization. The ability of the imprinted composite hydrogels to adsorb and remove Pb (II) ions from aqueous solutions was assessed using batch adsorption technique. The adsorption amount was pH-dependent, and the maximum adsorption capacity was observed at pH 5.0. The adsorption process could be well described by the Langmuir isotherm. The adsorption equilibrium was achieved within 15 min, and the kinetics of adsorption followed a pseudo-second-order rate equation. Thermodynamic parameters such as the Gibbs free energy (DG 0 ), enthalpy (DH 0 ), and entropy (DS 0 ) for the metal ion adsorption were estimated. Results suggested that the adsorption process was a spontaneous, exothermic process that had positive entropy. The Pb(II) ion-imprinted composite hydrogels exhibited extremely high selectivity coefficient, which was much higher than that of corresponding non-imprinted composite hydrogels. Regeneration studies suggested that metal ion rebinding capacity of the Pb(II) ion-imprinted composite hydrogels did not change significantly through six cycles of sorption-desorption process.

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Modification of porous silica particles with poly(acrylic acid)

Cited by 43 publications

References 8 publications

Effects of surface modification of glass beads with poly(acrylic acid)

Effects of surface modification of glass beads with poly(acrylic acid)

Contribution of hydrogen and/or covalent bonds on reinforcement of natural rubber latex films with surface modified silica

Ion-imprinted poly(2-acrylamido-2-methyl-1-propansulfonic acid)/modified silica composite hydrogel for selective and enhanced adsorption of Pb(II) ions

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