Encapsulation of submicrometer-sized silica particles by a thin shell of poly(methyl methacrylate)

Freris, Isidora; Cristofori, Davide; Riello, Pietro; Benedetti, Alvise

doi:10.1016/j.jcis.2008.11.052

Cited by 37 publications

(22 citation statements)

References 19 publications

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“…Zhang et al (11) reported that the stability of emulsion polymerization was influenced by the amount of nano-silica particles, hydroxyethyl methacrylate (HEMA) and reaction temperature. Freris et al (12) prepared nano-silica by Stöber method and applied it in the emulsion polymerization to obtain polymer encapsulation of nano-silica particles. However, most literature reported that nanosilica/polyacrylate composite emulsions were synthesized with the available nano-silica or the nano-silica prepared by sol-gel method in ethanol as dispersing media (13,14).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Zeng

et al. 2010

Journal of Macromolecular Science, Part A

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Organic nano-silica was firstly synthesized by sol-gel method with methyl methacrylate (MMA) and butyl acrylate (BA) in the micelles as dispersing media, tetraethoxysilicate (TEOS) as precursor, hydrochloric acid as catalyst and methacryloylpropyl trimethoxysilane (A174) as modifier. Subsequently, the nano-silica/polyacrylate composite emulsions were directly prepared by in-situ emulsion polymerization under the action of the initiator. The structure and properties were characterized by Fourier transform infrared spectroscopy (FTIR), dynamic light-scattering (DSL), thermogracvimetry (TG) and transmission electron microscopy (TEM). The results showed that A174-modified nano-silica was successfully synthesized in the acrylate-based emulsions by the sol-gel method. The nano-silica was encapsulated by polyacrylate, and the composite latex particles exhibited an apparent core-shell structure. The A174 could improve the lipophilicity of nano-silica and increase the grafting efficiency of polyacrylate on nano-silica particles. The nano-silica/polyacrylate composite latex film had better thermal stability, and the composite latex particles had greater average size and broader size distribution in contrast to those of pure polyacrylate emulsions.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Zeng

et al. 2010

Journal of Macromolecular Science, Part A

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“…6a and b. In the same way, when PDA was immobilized onto silica nanoparticles (150 nm) prepared by the well-known Stöber method [31,32], their color was changed to blue and red, as shown in Supporting Fig. 8.…”

Section: Resultsmentioning

confidence: 85%

“…The silica particles were synthesized using the Stöber method [31,32], which is one of the well known methods of preparing mono-dispersed silica particles. A 30 mL portion of ammonium hydroxide was added into 600 mL of ethanol and 150 mL of water solution, and then 31 mL of TEOS was added to the ethanol solution under vigorous magnetic stirring.…”

Section: Preparation Of Silica Npsmentioning

confidence: 99%

Preparation of polydiacetylene immobilized optically encoded beads

Jun

Baek

Kang

et al. 2011

Journal of Colloid and Interface Science

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“…The estimated average copolymer layer thickness was 5 ± 1 nm. Freris et al [50] obtained similar results using poly(methyl methacrylate) to encapsulate SiO 2 NP with 180 nm diameter. In the related work, the authors identified a polymeric layer with thickness between 2 and 10 nm by TEM.…”

Section: Use Of Ps-b-pvp Copolymer As Surface Modifier Agent Of Sio 2 Npmentioning

confidence: 74%

Synthesis and applications of polystyrene-block-poly(N-vinyl-2-pyrrolidone) copolymers

Farias

Gonçalves

2016

Polímeros

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SbstractThis work describes the synthesis and applications of amphiphilic polystyrene-block-poly(N-vinyl-2-pyrrolidone) (PS-b-PVP) copolymers as a silver and silica nanoparticle surface modification agent. The synthesis of PS-b-PVP was carried out using controlled/living radical polymerization techniques. The synthesis of the block copolymers was confirmed by gel permeation chromatography and hydrogen nuclear magnetic resonance, presenting a polydispersity index of around 1.4 and number average molecular weight ranging between 10,000-14,000 g mol -1. The PS-b-PVP copolymers were applied as a silver nanoparticle (AgNP) stabilizing agent. These nanoparticles were produced by a single step and presented an 11 ± 1 nm diameter. Furthermore, the PS-b-PVP copolymers were also applied as a silica nanoparticle (SiO 2 NP) surface modification agent. The SiO 2 NP were synthesized by the Stöber method presenting a 72 ± 9 nm diameter. The SiO 2 NP surface modification by adsorption of PS-b-PVP caused the formation of a 5 ± 1 nm thick polymeric layer, providing the SiO 2 NP with a hydrophobic surface character. The structural and chemical characteristics shown by PS-b-PVP copolymers highlights their versatility for several applications, such as: water-in-oil emulsifier, stabilizing or coupling agents between inorganic particles and polymeric matrices.

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Encapsulation of submicrometer-sized silica particles by a thin shell of poly(methyl methacrylate)

Cited by 37 publications

References 19 publications

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Synthesis and Characterization of Nano-silica/Polyacrylate Composite Emulsions by Sol-gel Method andin-situEmulsion Polymerization

Preparation of polydiacetylene immobilized optically encoded beads

Synthesis and applications of polystyrene-block-poly(N-vinyl-2-pyrrolidone) copolymers

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