Solution Structure of Metal Particles Prepared in Unimolecular Reactors of Amphiphilic Hyperbranched Macromolecules

Garamus, Vasil M.; Максимова, Т. В.; Richtering, Walter; Aymonier, Cyril; Thomann, Ralf; Antonietti, Lydie; Mecking, Stefan

doi:10.1021/ma048965g

Cited by 47 publications

(34 citation statements)

References 46 publications

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“…[39][40][41][42][43][44][45][46][47] The hyperbranched copolymer formed in the present copolymerization (run 8 in Table I) was subjected to stabilization of nanoparticles of Au, Ag, and Pd. Each metal salt was reduced with NaBH 4 at room temperature in the presence of the copolymer, and then the metal particles-containing copolymer was isolated.…”

Section: Stabilization Of Metal Nanoparticles With the Resulting Copomentioning

confidence: 99%

“…These absorptions are due to the plasmon absorptions of the Au and Ag nanoparticles. 39,41,[44][45][46][47] Figure 9 presents TEM images of (a) Au and (b) Pd particles in the copolymer matrix prepared above. Au and Pd clusters were observed as nanoparticles of diameters of 10-15 and 8-30 nm, respectively.…”

Section: Stabilization Of Metal Nanoparticles With the Resulting Copomentioning

confidence: 99%

“…As stated above, the diameters of the copolymer particles were much smaller than those of the metal particles. Therefore, the metal particles were stabilized not by encapsulating in the inner voids of the hyperbranched copolymer [40][41][42][43]47 but by attaching multiple hyperbranched copolymer molecules to one metal particle. Formation of Porous Film from the Resulting Copolymer An opaque film was formed by casting a copolymer solution in THF (10 mg/mL) on a glass slide.…”

Section: Stabilization Of Metal Nanoparticles With the Resulting Copomentioning

confidence: 99%

See 2 more Smart Citations

Hyperbranched Polymer through Initiator-Fragment Incorporation Radical Copolymerization of Divinyl Adipate with Allyl Acetate: Synthesis, Characterization, Dye Solubilization, Metal-Nanoparticle Stabilization, and Porous Film Formation

Sato

Nomura

Hirano

et al. 2006

Polym J

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ABSTRACT:The copolymerization of divinyl adipate (DVA) as an effective cross-linker with allyl acetate (AAc) as a degradative chain transfer reagent was carried out at 70 and 80 C in benzene using dimethyl 2,2 0 -azobisisobutyrate (MAIB) of high concentrations as initiator. When the MAIB concentration as high as 0.60 mol/L was used, the copolymerization of DVA (0.20 mol/L) and AAc (0.50 mol/L) proceeded homogeneously without any gelation to give soluble copolymers in a yield of about 30% based on the total weight of DVA, AAc, and MAIB. The copolymer formed in the copolymerization at 80C for 6 h consisted of the DVA units with (3 mol %) and without (24 mol %) double bond, the AAc unit (35 mol %), and the methoxycarbonylpropyl group (38 mol %) from MAIB. Such a large fraction of the incorporated initiator-fragment as terminal group indicates that the copolymer has a hyperbranched structure. The copolymer showed an upper critical solution temperature (38 C on cooling) in a tetrahydrofuran (THF)-water [2:1 (v/v)] mixture, and also exhibited potentials in solubilization of Rhodamine 6G as a dye probe and stabilization of metal nanoparticles. A porous film was obtained simply by casting a copolymer solution in THF.

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Section: Stabilization Of Metal Nanoparticles With the Resulting Copomentioning

confidence: 99%

Section: Stabilization Of Metal Nanoparticles With the Resulting Copomentioning

confidence: 99%

Section: Stabilization Of Metal Nanoparticles With the Resulting Copomentioning

confidence: 99%

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Hyperbranched Polymer through Initiator-Fragment Incorporation Radical Copolymerization of Divinyl Adipate with Allyl Acetate: Synthesis, Characterization, Dye Solubilization, Metal-Nanoparticle Stabilization, and Porous Film Formation

Sato

Nomura

Hirano

et al. 2006

Polym J

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“…20,[33][34][35] From a practical point of view, the amphiphilic hyperbranched macromolecules have potential practical applications. [36][37][38] Therefore, it is interesting to use hyperbranched polymers as the favorable starting materials for the synthesis of a globular amphiphile with unimolecular micellar properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of thermoresponsive unimolecular polymeric micelles with a hydrophilic hyperbranched poly(glycidol) core

Luo

Zhang

et al. 2010

Polym J

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This paper describes the reversible phase transition behavior of a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) shell at the surface of a hydrophilic core. Reversible addition-fragmentation transfer (RAFT) polymerization of N-isopropylacrylamide was conducted using a hydrophilic hyperbranched poly(glycidol) (HPG)-based macroRAFT agent. At lower temperatures (o30 1C), the resultant multiarm star block copolymer (HPG-PNIPAM) exists as unimolecular micelles, with hydrophilic HPG as the core and a densely grafted PNIPAM brush as the shell. In laser light scattering (LLS) studies, the concentration used for HPG-PNIPAM is 5Â10 À6 g ml À1 , to avoid any possible aggregation between dendritic unimolecular micelles above the lower critical solution temperature (B32 1C) of PNIPAM. What we observe for the phase transition of HPG-PNIPAM involves only unimolecular process. A combination of dynamic and static LLS studies of HPG-PNIPAM in aqueous solution reveals a reversible phase transition on heating and cooling.

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“…Dendritic polymers including dendrimers, hyperbranched polymers, and dendritic star polymers are used for encapsulation and templation of nanoparticles. 11,12 In an ideal case of encapsulation, metal ions are pouched inside dendritic polymers, and then were transformed chemically into the desired product. To accomplish this goal, strong interactions between functional groups within the dendritic polymers and ions in solution should exist, for example in dendritic poly(amidoamine) (PAMAM) or poly(propylene imine).…”

Section: Introductionmentioning

confidence: 99%

Form‐fill‐seal methodology for controlled encapsulation of small silver particles in hyperbranched polyglycidol

Ding¹,

Liu²,

Shi³

et al. 2009

J of Applied Polymer Sci

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Production of polar hyperbranched polymers and encapsulation of small particles in the hyperbranched polymers is like ''forming'' pouches and then ''filling'' these pouches. Modification of the end-groups of the hyperbranched polymers with relative apolar groups is like ''sealing'' the pouches. In this article, we demonstrated that two methods depending on changed sequences, i.e., Form-Fill-Seal and Form-Seal-Fill methods resulted in different sized small particles with sizedepended properties. By using these approaches, small metal nano-particles can be encapsulated inside polar microzones of dendritic-star polymers taking advantage of the difference in partition coefficients instead of strong interactions between the dendritic polymers and ions. We used the methodology to produce small silver particles encapsulated in hyperbranched polyglycidol (HPG).The HPG was synthesized via anionic ring-opening multibranching polymerization of glycidol. The ''sealing'' process was fulfilled by polymerization of e-caprolactone initiated from the end groups of HPG. In the FormFill-Seal approach, Ag þ was filled inside HPG, and then was sealed before reduction to Ag; whereas the ''pouch'' of HPG was sealed at first, and then Ag þ was filled inside HPG by diffusion in the Form-Seal-Fill approach. Mainly nanometer-sized silver particles were formed by the Form-Fill-Seal approach, whereas silver clusters of several atoms were formed in the Form-Seal-Fill approach.

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Solution Structure of Metal Particles Prepared in Unimolecular Reactors of Amphiphilic Hyperbranched Macromolecules

Abstract: Figure S1. Density of polymer solutions at various concentrations.

Cited by 47 publications

References 46 publications

Hyperbranched Polymer through Initiator-Fragment Incorporation Radical Copolymerization of Divinyl Adipate with Allyl Acetate: Synthesis, Characterization, Dye Solubilization, Metal-Nanoparticle Stabilization, and Porous Film Formation

Hyperbranched Polymer through Initiator-Fragment Incorporation Radical Copolymerization of Divinyl Adipate with Allyl Acetate: Synthesis, Characterization, Dye Solubilization, Metal-Nanoparticle Stabilization, and Porous Film Formation

Synthesis of thermoresponsive unimolecular polymeric micelles with a hydrophilic hyperbranched poly(glycidol) core

Form‐fill‐seal methodology for controlled encapsulation of small silver particles in hyperbranched polyglycidol

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