Surface modification of silica nanoparticles by grafting poly(methyl methacrylate) using atom transfer radical polymerisation with activators regenerated by electron transfer

Du, Shasha; Zhou, Guowei; Wang, Xiliang; Li, Tianduo; Xu, Yunqiang; Zhang, Lei

doi:10.1049/mnl.2010.0238

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…Growth of P(MEO 2 MA x OEGMA y ) from ZnO@Ph-Cl and Fe 3 O 4 @Ph-Cl NPs For a biological concern, the ARGET-ATRP process has been extended to modify fluorescent ZnO QDs and magnetic Fe 3 O 4 NPs. Both of those NPs are of low cytotoxicity [5,23], and are referred as very promising tools for diagnostic in medical field. MOE 2 MA and OEGMA random responsive copolymers were grown from each NPs surfaces following the method previously described.…”

Section: Resultsmentioning

confidence: 99%

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Efficient synthetic access to thermo-responsive core/shell nanoparticles

et al. 2017

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Core/shell nanostructures based on silica, fluorescent ZnO quantum dots (QDs) and superparamagnetic FeO nanoparticles (NPs) were prepared and fully characterized by the combination of different techniques and the physical properties of the nanostructures were studied. We demonstrate the efficiency of the atom transfer radical polymerization with activators regenerated by electron transfer process to graft (co-)polymers of different structures and polarity at the surface of metal oxide NPs. The influence of the polymer chain configuration on the optical properties of the ZnO/polymer core/shell QDs was enlightened. Concerning the magnetic properties of the FeO/polymer nanostructures, only the amount of the grafted polymer plays a role on the saturation magnetization of the NPs and no influence of the aggregation was evidenced. The simple and fast process described in this work is efficient for the grafting of copolymers from surfaces and the derived NPs display the combination of the physical properties of the core and the macromolecular behavior of the shell.

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Section: Resultsmentioning

confidence: 99%

“…Styrene was purified following the procedure described elsewhere [23]. All the chemical reagents were purchased from Sigma-Aldrich, excepted ((chloromethyl)phenylethyl)-trimethoxysilane (Gelest, >95%) (CMPETMS).…”

Section: Methodsmentioning

confidence: 99%

Efficient synthetic access to thermo-responsive core/shell nanoparticles

et al. 2017

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“…Polymer scientists have used this strategy to prepare poly(acrylonitrile) decorated silica nanoparticles 189 and polystyrene resins, 188 as well as crosslinked networks 190 and ionic-liquid based microemulsions. 127 Similarly, ARGET ATRP conditions were used to modify silica nanoparticles 90,102 and poly(vinylidene fluoride) 92 by grafting PMMA chains onto their surfaces or chains. Little mechanistic study has been devoted to Fe-mediated ICAR, SARA and ARGET RDRP processes, with the assumption that the systems behave similarly to their copper counterparts.…”

Section: Reducing the Amount Of Fe Catalyst In Atrpmentioning

confidence: 99%

Iron-mediated reversible deactivation controlled radical polymerization

Poli

Allan

Shaver

2014

Progress in Polymer Science

128

117

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Metal-mediated reversible deactivation radical polymerisation (RDRP) is now a cornerstone of functional polymer synthesis, dominated by copper complexes and the Atom Transfer Radical Polymerisation (ATRP) moniker. A limitation of this approach is the contamination of the resultant polymers by the coloured copper complexes, requiring purification steps, although protocols to reduce the amount of copper catalyst have been developed. Iron is an interesting alternative because of its low cost, low toxicity and reduced intensity of its optical absorption spectrum. Use of this metal in RDRP began in the late 90s and has continuously intensified. This review comprehensively covers all the work reported so far on RDRP mediated by iron complexes, organised according to ligand type, and discusses the specificities of this metal in terms of the multitude of accessible spin states and the interplay of different equilibria: atom transfer vs. direct radical trapping, associative vs. dissociative exchange, chain transfer by direct β-H atom transfer vs. β-H elimination from the dormant alkyl species.

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“…Yang et al 29 designed and synthesized a novel, well-dened, pH-sensitive amphiphilic triblock copolymer brush polylactide (PLA)-b-PMAA-b-PPEGMA by combining ARGET ATRP and ring opening polymerization techniques. Our group previously synthesized SiO 2 -PMMA nanoparticles by ARGET ATRP, 30 SiO 2 -PMMA nanoparticles with tunable shell thickness by iron(III) catalystmediated AGET ATRP, and hydrophobic PMMA-polystyrene diblock copolymer brushes on the surface of the silica nanospheres. 31 TiO 2 , a semiconductor photocatalyst, is attracting considerable research attention in wide-ranging applications, such as organic pollutant degradation, water splitting, and photovoltaic devices.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and photoactivity of a tunable-void SiO₂–TiO₂core–shell structure on modified SiO₂nanospheres by grafting an amphiphilic diblock copolymer using ARGET ATRP

et al. 2014

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SiO₂-based composites have important applications in various technological fields. In this work, a tunablevoid SiO₂-TiO₂ core-shell structure was successfully prepared for the first time using SiO₂-polymethyl methacrylate (PMMA)-polyoligo(ethylene glycol)methyl ether methacrylate (PO(EO)nMA) (n = 2, 5, and 8). An amphiphilic copolymer was used as the template, and calcination was performed using tetrabutyl titanate (TBT) as the titanium source. SiO₂-PMMA-b-PO(EO)nMA microspheres were first synthesized through activators regenerated by electron transfer-atom transfer radical polymerization. Methyl methacrylate and O(EO)nMA were grafted with different EO unit numbers onto the surface of the halogen functional group of SiO₂. TBT was hydrolyzed along with the PO(EO)nMA chain through hydrogen bonding, and then the SiO₂-TiO₂ core-shell structure was acquired through calcination to remove the polymer. Simultaneously, amorphous TiO₂ crystallized during calcination. A series of characterizations indicated that the amphiphilic block copolymer was grafted onto SiO₂ mesoparticle surfaces, the titania samples existed only in the anatase phase, and the prepared SiO₂-TiO₂ had hierarchically nanoporous structures. The gradient hydrophilicity of the PMMA-b-PO(EO)nMA copolymer template facilitated the hydrolysis of TBT molecules along the PO(EO)nMA to PMMA segments, thereby tuning the space between the core and the shell. In addition, the space was about 6 nm when the EO number was 2, and the space was about 10 nm when the EO numbers were 5 and 8. The photocatalytic activities of the SiO₂-TiO₂ materials were tested on the photodegradation of methyl orange.

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Surface modification of silica nanoparticles by grafting poly(methyl methacrylate) using atom transfer radical polymerisation with activators regenerated by electron transfer

Cited by 10 publications

References 19 publications

Efficient synthetic access to thermo-responsive core/shell nanoparticles

Efficient synthetic access to thermo-responsive core/shell nanoparticles

Iron-mediated reversible deactivation controlled radical polymerization

Fabrication and photoactivity of a tunable-void SiO₂–TiO₂core–shell structure on modified SiO₂nanospheres by grafting an amphiphilic diblock copolymer using ARGET ATRP

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Surface modification of silica nanoparticles by grafting poly(methyl methacrylate) using atom transfer radical polymerisation with activators regenerated by electron transfer

Cited by 10 publications

References 19 publications

Efficient synthetic access to thermo-responsive core/shell nanoparticles

Efficient synthetic access to thermo-responsive core/shell nanoparticles

Iron-mediated reversible deactivation controlled radical polymerization

Fabrication and photoactivity of a tunable-void SiO2–TiO2core–shell structure on modified SiO2nanospheres by grafting an amphiphilic diblock copolymer using ARGET ATRP

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Fabrication and photoactivity of a tunable-void SiO₂–TiO₂core–shell structure on modified SiO₂nanospheres by grafting an amphiphilic diblock copolymer using ARGET ATRP