Surfactant-free synthesis of layered double hydroxide-armored latex particles

Qiao, Xiaoguang; Dugas, Pierre‐Yves; Prevot, Vanessa; Bourgeat‐Lami, Élodie

doi:10.1039/d0py00140f

Cited by 14 publications

(5 citation statements)

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“…Among the variety of inorganic particles investigated so far, Laponite® clay has been found of particular interest. [5,[23][24][25][26][27][28][29][30][31] Indeed, it presents the advantages of not requiring the use of auxiliary comonomers. The objective of the present work is to elucidate and model the nucleation and stabilization mechanisms taking place in the presence of Laponite® clay.…”

Section: Introductionmentioning

confidence: 99%

Modeling Polystyrene Homogeneous‐Coagulative Nucleation in Pickering Emulsion Polymerization

Brunier

Chevalier

Bourgeat‐Lami

et al. 2022

Macro Reaction Engineering

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Investigation of particle nucleation in surfactant-free emulsion polymerization of styrene using Laponite clay as Pickering stabilizer is considered. The effective number of clay platelets contributing to the surface charge of the polymer particles was calculated, and used to estimate their stabilizing efficiency. A coagulative nucleation mechanism was proposed and the coagulation coefficient was calculated using the DLVO theory. The Hamaker constant involved in the attractive potential of the clay-polymer composite particles was measured experimentally.The model was found to fit the experimental data in terms of the number of nucleated particles and the nucleation period. The effective number of clay platelets contributing to the surface charge was found higher than the number of platelets allowing full polymer latex surface coverage at the end of nucleation. Moreover, efficient stabilization against coagulation required almost complete coverage.

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Section: Introductionmentioning

confidence: 99%

Modeling Polystyrene Homogeneous‐Coagulative Nucleation in Pickering Emulsion Polymerization

Brunier

Chevalier

Bourgeat‐Lami

et al. 2022

Macro Reaction Engineering

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“…As an alternative approach to the polymerization of Pickering (mini)emulsions, inorganic solids can also be directly employed as “Pickering” stabilizers of conventional emulsion polymerization reactions, replacing molecular surfactants. Numerous studies involving various inorganic particles and synthetic strategies have now been conducted in this area, opening the door to composite particles and coatings with a wide range of potential applications. − The corresponding process, called “Pickering emulsion polymerization,” has indeed many advantages. The size, composition, and functionality of the polymer particles can be tuned easily by varying experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Iron Oxide-Armored Latex Particles by Pickering Emulsion Polymerization Using 2-Acrylamido-2-methyl-1-propane Sulfonic Acid as an Auxiliary Comonomer

Dugas

Lansalot

et al. 2022

Macromolecules

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Iron oxide (IO)-armored poly(methyl methacrylate) and polystyrene latex particles have been synthesized by surfactant-free emulsion polymerization using 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) as an auxiliary comonomer. The use of pure water as a dispersion medium led to unstable latexes both in the presence and absence of IO nanoparticles. In stark contrast, successful syntheses were achieved with the addition of ethanol (15 vol % based on water) to the suspension medium. Transmission electron microscopy showed well-defined “armored” structures with the IO nanoparticles located at the latex surface, forming the so-called raspberry-like morphology. The reported strategy allowed the preparation of polymer/IO composite particles with up to 96% IO incorporation efficiency and 60% IO coverage of the latex surface. The effect of the nature of the core monomer and the AMPS and IO contents on the polymerization kinetics, particle size, and morphology was studied in detail. The final nanocomposite particles possess superparamagnetic properties with a high magnetic response, enabling their rapid and efficient separation under an external magnetic field. A mechanism for the formation of the IO-armored latexes is proposed.

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“…Armored particles have a polymer core coated with inorganic nanoparticles; such armored particles can be used as feedstocks for composite structures. These particles can be prepared by dispersion polymerization of the discontinuous phase of Pickering emulsions − or by the deposition of inorganic particles onto preformed polymer particles. − Two-dimensional (2D) nanosheets, including graphene oxide (GO) nanosheets and clay platelets, have been widely used to prepare armored particles, most commonly by the dispersion polymerization method. For example, the Pentzer group demonstrated the preparation of armored particles using oil-in-water emulsions stabilized by GO and UV-initiated thiol-ene polyaddition polymerization of the oil phase. − The same group used oil-in-oil emulsions stabilized by alkylated GO and thermally initiated free-radical polymerization of a methacrylate monomer as the discontinuous phase to prepare armored particles. , In a similar vein, Zhang et al .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electronic Applications of Particle-Templated Ti₃C₂T_zMXene–Polymer Films via Pickering Emulsion Polymerization

Cao

Escamilla

Anas

et al. 2021

ACS Appl. Mater. Interfaces

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MXene/polymer composites have gained widespread attention due to their high electrical conductivity and extensive applications, including electromagnetic interference (EMI) shielding, energy storage, and catalysis. However, due to the difficulty of dispersing MXenes in common polymers, the fabrication of MXene/polymer composites with high electrical conductivity and satisfactory EMI shielding properties is challenging, especially at low MXene loadings. Here, we report the fabrication of MXenearmored polymer particles using dispersion polymerization in Pickering emulsions and demonstrate that these composite powders can be used as feedstocks for MXene/polymer composite films with excellent EMI shielding performance. Ti 3 C 2 T z nanosheets are used as the representative MXene, and three different monomers are used to prepare the armored particles. The presence of nanosheets on the particle surface was confirmed by X-ray photoelectron spectroscopy and scanning electron microscopy. Hot pressing the armored particles above T g of the polymer produced Ti 3 C 2 T z /polymer composite films; the films are electrically conductive because of the network of nanosheets templated by the particle feedstocks. For example, the particle-templated Ti 3 C 2 T z / polystyrene film had an electrical conductivity of 0.011 S/cm with 1.2 wt % of Ti 3 C 2 T z , which resulted in a high radio frequency heating rate of 13−15 °C/s in the range of 135−150 MHz and an EMI shielding effectiveness of ∼21 dB within the X band. This work provides a new approach to fabricate MXene/polymer composite films with a templated electrical network at low MXene loadings.

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Surfactant-free synthesis of layered double hydroxide-armored latex particles

Abstract: MgAl-layered double hydroxide (LDH)-armored latexes were produced by Pickering emulsion polymerization of styrene using 2-hydroxyethyl methacrylate (HEMA) and methyl methacrylate (MMA) as auxiliary comonomers.

Cited by 14 publications

References 52 publications

Modeling Polystyrene Homogeneous‐Coagulative Nucleation in Pickering Emulsion Polymerization

Modeling Polystyrene Homogeneous‐Coagulative Nucleation in Pickering Emulsion Polymerization

Synthesis of Iron Oxide-Armored Latex Particles by Pickering Emulsion Polymerization Using 2-Acrylamido-2-methyl-1-propane Sulfonic Acid as an Auxiliary Comonomer

Synthesis and Electronic Applications of Particle-Templated Ti₃C₂T_zMXene–Polymer Films via Pickering Emulsion Polymerization

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Surfactant-free synthesis of layered double hydroxide-armored latex particles

Abstract: MgAl-layered double hydroxide (LDH)-armored latexes were produced by Pickering emulsion polymerization of styrene using 2-hydroxyethyl methacrylate (HEMA) and methyl methacrylate (MMA) as auxiliary comonomers.

Cited by 14 publications

References 52 publications

Modeling Polystyrene Homogeneous‐Coagulative Nucleation in Pickering Emulsion Polymerization

Modeling Polystyrene Homogeneous‐Coagulative Nucleation in Pickering Emulsion Polymerization

Synthesis of Iron Oxide-Armored Latex Particles by Pickering Emulsion Polymerization Using 2-Acrylamido-2-methyl-1-propane Sulfonic Acid as an Auxiliary Comonomer

Synthesis and Electronic Applications of Particle-Templated Ti3C2TzMXene–Polymer Films via Pickering Emulsion Polymerization

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Synthesis and Electronic Applications of Particle-Templated Ti₃C₂T_zMXene–Polymer Films via Pickering Emulsion Polymerization