Polymer-silicate nanocomposites produced by <i>in situ</i>
 atom transfer radical polymerization

Zhao, Hanying; Argoti, S. Dayana; Farrell, Brendan P.; Shipp, Devon A.

doi:10.1002/pola.11071

Cited by 92 publications

(72 citation statements)

References 52 publications

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“…The solution was poured into methanol (500 mL) to precipitate the polymer chains. 26 The separated chains were also passed through a neutral aluminum oxide column to remove catalyst particles. Finally, the cleaved and free polymer chains were dried in a vacuum oven at 65 C.…”

Section: Separation Of Attached and Unattached Polymer Chainsmentioning

confidence: 99%

Evaluation of the confinement effect of nanoclay on the kinetics of styrene atom transfer radical polymerization

Roghani‐Mamaqani

Haddadi‐Asl

Najafi

et al. 2011

J of Applied Polymer Sci

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The grafting through method was employed to study the effect of nanoclay confinement on the atom transfer radical polymerization (ATRP) of styrene. An ammonium salt containing a double bond on its structure was used as a clay modifier. Employing ATRP to polymerize styrene in the presence of modified montmorillonite resulted in a finely well-defined polystyrene nanocomposite. The gas chromatography (GC) results showed the linear increase of ln(M 0 /M) versus time, which indicated the controlled behavior of the polymerization. Another confirmation of the living nature of the polymerization was the linear increase of molecular weight against monomer conversion concluded from the gel permeation chromatography (GPC) data. Nanoclay exerted acceleration on the polymerization of free polystyrene chains. The polydispersity indexes of polymer chains increased by the addition of nanoclay. In the case of clay-attached polystyrene chains, number and weight-average molecular weights were lower than that of freely dispersed polystyrene chains. The polydispersity index of the clay-attached chains was higher in respect to the freely dispersed polystyrene chains. The living nature of polymer chains was more elucidated by Fourier transform infrared spectroscopy (FTIR). Exfoliation of the clay layers in the polymer matrix of polystyrene nanocomposite containing the lowest amount of nanoclay has proven by Transmission Electron Microscopy (TEM).

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Section: Separation Of Attached and Unattached Polymer Chainsmentioning

confidence: 99%

Evaluation of the confinement effect of nanoclay on the kinetics of styrene atom transfer radical polymerization

Roghani‐Mamaqani

Haddadi‐Asl

Najafi

et al. 2011

J of Applied Polymer Sci

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“…4,18 Regardless of method exfoliation is aided by the addition of an organic modifier to make hydrophilic clays more amenable to hydrophobic polymer interactions and to increase interlayer spacing. In situ polymerization has proven to be the most promising method for silicate exfoliation and can be accomplished with large chain graft-to reactions or surface growth graft-from polymerizations.…”

Section: Silicate Exfoliationmentioning

confidence: 99%

“…The synthesis and ion exchange of BMP, an ATRP initiator, with MMT is a simple two step synthesis previously described elsewhere. 72,89 It may be summarized as the addition of 2-bromoisobutyryl bromide to 11-bromo-1-undecanol and subsequent addition of trimethyl amine to produce a cationic alkyl chain with a terminal halide. The synthesis of an analogous inert compound, DMP, uses 2,2-dimethyl acetyl chloride in place 33 of 2-bromoisobutyryl bromide.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Ordered Montmorillonite Block Copolymer Brushes

2010

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“…The introduction of organic salts changes the chemical properties of silicate layer surfaces and increases their compatibility with polymers. The silicate layer surfaces of montmorillonite (MMT) as typical clay have been modified by various controlled living polymerization techniques, such as atom transfer radical polymerization [15][16][17][18], reversible additionfragmentation chain transfer polymerization [19][20][21], and nitroxide-mediated polymerization [22][23][24]. These polymerizations take place in the galleries with growing polymer chains spreading the distance between the silicate layers.…”

Section: Introductionmentioning

confidence: 99%

Melt-Processable Nanocomposites Grafting-From Platelet Surfaces by Vapor-Assisted Surface Polymerization

Andou

Nishida

2011

ISRN Nanotechnology

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One issue accompanying the melt-processing polymer/clay nanocomposites is the reaggregation of silicate platelets, which induces decreases in advantages of nanocomposites. To address this issue, vapor-assisted surface polymerization (VASP) method was applied with an initiator-attached and copolymerizable surfactant moiety-bound A-C18/C6MMT to obtain the exfoliated and intercalated nanocomposites using methylmethacrylate and styrene as vinyl monomers, respectively. The melt processing of the nanocomposites was carried out by a melt-compression molding method at 200• C. From XRD measurements, the C18/C6MMT-based nanocomposites showed no change in d-spacing even after melt processing, indicating the maintenance of the exfoliation and intercalation states. This maintenance must result from polymer chains grafting from the silicate layer surfaces, thus clearly confirming the anchoring effect of the copolymerizable surfactant moiety units.

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Polymer-silicate nanocomposites produced by in situ atom transfer radical polymerization

Cited by 92 publications

References 52 publications

Evaluation of the confinement effect of nanoclay on the kinetics of styrene atom transfer radical polymerization

Evaluation of the confinement effect of nanoclay on the kinetics of styrene atom transfer radical polymerization

Hierarchically Ordered Montmorillonite Block Copolymer Brushes

Melt-Processable Nanocomposites Grafting-From Platelet Surfaces by Vapor-Assisted Surface Polymerization

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