Mechanochemically conjugated PMHS/nano-SiO2 hybrid and subsequent optimum grafting density study

Lin, Jinbin; Chen, Hongling; Yuan, Yongbing; Ji, Yan

doi:10.1016/j.apsusc.2011.05.093

Cited by 38 publications

(21 citation statements)

References 35 publications

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“…The water acts as solvent and stimulates the physical bubbling process of composite foam due to water evaporation during the curing phase (60 °C). Analogous the reaction between CNT filler and hydride groups of PMHS (Figure ; stage 2) induces the formation of an oxygen bridge and hydrogen bubble . The so‐formed gaseous hydrogen enhances the chemical bubbling of the composite SF.…”

Section: Resultsmentioning

confidence: 95%

Synthesis of reusable silicone foam containing carbon nanotubes for oil spill remediation

Piperopoulos

Calabrese

Mastronardo

et al. 2017

J of Applied Polymer Sci

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The aim of this work is the synthesis of silicone foam containing carbon nanotubes (CNT) for oil spills remediation. The CNT silicone foams are obtained by foaming a solution of a silicone matrix with CNT filler (5.6 wt %) in presence of a Sn-based catalyst. Pristine and functionalized CNT have been used. All the obtained materials present a foam morphology with an open cell structure. Each foam is tested in four commonly used oils (kerosene, pump oil, naphtha, and crude oil). Among all, the foam filled with pristine CNT shows the highest sorption capacity (800 wt % in virgin naphtha) and an excellent reusability (up to 10 times).But, until now, none of the mentioned systems is entirely satisfactory because of certain problems, such as permanent hydrophilic nature, low flammability, and sorption efficiency. Moreover, many of them are complex, expensive, and bulky.Recently Chen et al. demonstrated a simple, inexpensive, versatile, and scalable process to prepare superhydrophobic and Additional Supporting Information may be found in the online version of this article.

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Section: Resultsmentioning

confidence: 95%

Synthesis of reusable silicone foam containing carbon nanotubes for oil spill remediation

Piperopoulos

Calabrese

Mastronardo

et al. 2017

J of Applied Polymer Sci

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“…The resulting surface-modified pigment particles consist of PMHS strands that are grafted onto hydroxyl OH functional groups present on the native oxide surface of the aluminosilicate overlayer. We also investigated other bases that are known to promote the grafting of PMHS grafting to inorganic oxide and, in particular, silica surfaces, − such as ammonia and potassium hydroxide, but, as discussed below, these led to hydrolytically unstable hydrophobic coatings (vide infra). To assess the degree of hydrophobicity in the resulting surface-modified pigments in their dry state, capillary-rise measurements were used to estimate the advancing water/air contact angle .…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic Inorganic Oxide Pigments via Polymethylhydrosiloxane Grafting: Dispersion in Aqueous Solution at Extraordinarily High Solids Concentrations

et al. 2018

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Building on the recent demonstration of aqueous-dispersible hydrophobic pigments that retain their surface hydrophobicity even after drying, we demonstrate the synthesis of surface-modified Ti-Pure R-706 (denoted R706) titanium dioxide-based pigments, consisting of a thin (one to three monolayers) grafted polymethylhydrosiloxane (PMHS) coating, which (i) are hydrophobic in the dry state according to capillary rise and dynamic vapor sorption measurements and (ii) form stable aqueous dispersions at solid contents exceeding 75 wt % (43 vol %), without added dispersant, displaying similar rheology to R706 native oxide pigments at 70 wt % (37 vol %) consisting of an optimal amount of conventional polyanionic dispersant (0.3 wt % on pigment basis). The surface-modified pigments have been characterized via Si andC cross-polarization/magic angle spinning solid-state NMR spectroscopy; infrared spectroscopy; thermogravimetric and elemental analyses; and ζ potential measurements. On the basis of these data, the stability of the surface-modified PMHS-R706 aqueous dispersions is attributed to steric effects, as a result of grafted PMHS strands on the R706 surface, and depends on the chaotropic nature of the base used during PMHS condensation to the pigment/polysiloxane interface. The lack of water wettability of the surface-modified oxide particles in their dry state translates to improved water-barrier properties in coatings produced with these surface-modified pigment particles. The synthetic approach appears general as demonstrated by its application to various inorganic-oxide pigment particles.

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“…4). As a result, the organic chains adsorbed or bonded on the particles surface prevent the forming of oxygen bridge bonds and agglomeration between NPs [33,34]. The principal goals of the surface modification of NPs are stability and control growth of NPs, and the enhancement of the NP solubilization, recovery performance and physiochemical properties of NPs in various conditions and eventually, easy processing for target applications [35].…”

Section: Dispersion and Functionalization Of Al 2 O 3 Npsmentioning

confidence: 99%

“…Grafting synthetic polymers on the Al 2 O 3 NPs surface is another method for covalent functionalization of particles. This approach, increases the chemical functionality and changes the surface topology of both native inorganic and organic materials [32,33]. The molecular weight of polymer surfactant and the particles size of nano-alumina play important roles in the adsorption ratio of surfactants and the degree of steric repulsive force.…”

Section: Surface Functionalization Of the Al 2 O 3 Nps By Grafting Pomentioning

confidence: 99%

Recent development in the synthesis of polymer nanocomposites based on nano-alumina

Mallakpour

Khadem

2015

Progress in Polymer Science

172

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Mechanochemically conjugated PMHS/nano-SiO2 hybrid and subsequent optimum grafting density study

Cited by 38 publications

References 35 publications

Synthesis of reusable silicone foam containing carbon nanotubes for oil spill remediation

Synthesis of reusable silicone foam containing carbon nanotubes for oil spill remediation

Hydrophobic Inorganic Oxide Pigments via Polymethylhydrosiloxane Grafting: Dispersion in Aqueous Solution at Extraordinarily High Solids Concentrations

Recent development in the synthesis of polymer nanocomposites based on nano-alumina

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