Silica‐Polymethacrylate Hybrid Particles Synthesized Using High‐Pressure Atom Transfer Radical Polymerization

Pietrasik, Joanna; Hui, Chin Ming; Chaładaj, Wojciech; Dong, Hongchen; Choi, Jihoon; Jurczak, Janusz; Bockstaller, Michael R.; Matyjaszewski, Krzysztof

doi:10.1002/marc.201000531

Cited by 69 publications

(65 citation statements)

References 54 publications

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“…Methyl-methacrylate (MMA), styrene (S), and acrylonitrile (AN) monomers were obtained from Aldrich and purified by passing through an alumina-filled column. The synthesis of PMMA-and PS-grafted particle brush systems was performed using surface-initiated atom transfer radical polymerization (SI-ATRP) as described previously [37][38][39][40]. In a typical synthesis of poly(styrene-r-acrylonitrile) (PSAN)- Thermogravimetric Analysis (TGA).…”

Section: Experimental Methodsmentioning

confidence: 99%

High-Transparency Polymer Nanocomposites Enabled by Polymer-Graft Modification of Particle Fillers

et al. 2014

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The role of polymeric ligands on the optical transparency of polymer-matrix composites is analyzed by evaluating the effect of surface modification on the scattering cross-section of particle fillers in uniform particle dispersions. For the particular case of poly(styrene-r-acrylonitrile)-grafted silica particles embedded in poly(methyl methacrylate), it is shown that the tethering of polymeric chains with appropriate optical properties (such as to match the effective refractive index of the brush particle to the embedding matrix) facilitates the reduction of the particle scattering cross-section by several orders of magnitude as compared to pristine particle analogues. The conditions for minimizing the scattering cross-section of particle fillers by polymer-graft modification are established on the basis of effective medium as well as core-shell Mie theory and validated against experimental data on uniform liquid and solid particle dispersions. Effective medium theory is demonstrated to provide robust estimates of the "optimum polymer-graft composition" to minimize the scattering cross-section of particle fillers even in the limit of large particle dimensions (comparable to the wavelength of light). The application of polymer-graft modification to the design of large (500 nm diameter) silica particle composites with reduced scattering cross-section is demonstrated.

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Section: Experimental Methodsmentioning

confidence: 99%

High-Transparency Polymer Nanocomposites Enabled by Polymer-Graft Modification of Particle Fillers

et al. 2014

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“…The enhancement of k p / k t towards higher pressure has been found to improve dispersity in reversible addition–fragmentation chain‐transfer (RAFT) homopolymerizations of styrene and methyl methacrylate (MMA) . The improved living character of high‐pressure ATRP has been used for the synthesis of very high molar mass polymethacrylates and polystyrenes (

{\bar{M}}_{n}

> 10 6 g mol −1 ) …”

Section: Introductionmentioning

confidence: 99%

Pressure Dependence of Iron‐Mediated Methyl Methacrylate ATRP in Different Solvent Environments

Schroeder

Buback

Matyjaszewski

2013

Macro Chemistry & Physics

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Iron‐mediated atom‐transfer radical polymerization (ATRP) of methyl methacrylate (MMA) in N‐methylpyrrolidin‐2‐one (NMP) solution is investigated via online VIS/NIR spectroscopy up to 2500 bar. The activation–deactivation equilibrium constant, KATRP, decreases towards higher NMP content due to the formation of catalytically less active FeII/NMP species. The reaction volume increases from 1 to 15 cm3 mol−1 in passing from 16 to 92 mol% NMP. The same effects are observed for monomer‐free model systems with poly(MMA)–Br as the initiator. Investigations into iron‐catalyzed ATRP of MMA in less polar solvents or even without an additional solvent (i.e., for bulk ATRP) yield KATRP values, which are by two to three orders of magnitude higher than in the presence of NMP.

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“…Up until now, many polymerization techniques have been adapted for the preparation of polymer/silica nanocomposites, including conventional free radical [18], controlled/living radical polymerization (CLRP) [19][20][21], anionic [22], and cationic [23] polymerizations. To achieve optimum control over the structures of hybrids, CLRP techniques, because of their ability to prepare welldefined, narrow-polydispersity-index (PDI) polymers with versatile architectures, are preferred over the other methods.…”

Section: Introductionmentioning

confidence: 99%

A study on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization

et al. 2012

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A number of batch polymerizations were performed to study the effect of pristine nanoparticle loading on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization. In order to improve the dispersion of silica nanoparticles in PMMA matrix, the silanol groups of the silica are functionalized with methyl methacrylate groups and modified nanoparticles were used to synthesize PMMA/modified silica nanocomposites via RAFT polymerization. Prepared samples were characterized by thermogravimetric analysis (TGA), dynamic light scattering (DLS), dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). According to results, introduction of modified nanoparticles results in better thermal and mechanical properties than those of pristine nanoparticles. Also, surface modification and increasing silica nanoparticles result in variation of thermal degradation behavior of nanocomposites. The best improvement of mechanical and thermophysical properties is achieved for nanocomposites containing 7 wt. % silica nanoparticles.

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Silica‐Polymethacrylate Hybrid Particles Synthesized Using High‐Pressure Atom Transfer Radical Polymerization

Cited by 69 publications

References 54 publications

High-Transparency Polymer Nanocomposites Enabled by Polymer-Graft Modification of Particle Fillers

High-Transparency Polymer Nanocomposites Enabled by Polymer-Graft Modification of Particle Fillers

Pressure Dependence of Iron‐Mediated Methyl Methacrylate ATRP in Different Solvent Environments

A study on the properties of PMMA/silica nanocomposites prepared via RAFT polymerization

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