Preparation of core-shell polymer colloid particles by encapsulation

Ottewill, R. H.; Schofield, Andrew B.; Waters, J. A.; Williams, Neal

doi:10.1007/s003960050081

Cited by 106 publications

(90 citation statements)

References 32 publications

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“…Small cationic latex particles of poly(butyl methacrylate) were adhered onto the surface of larger anionic polystyrene latex particles [21]. Upon raising the temperature of the assembled colloidal dispersion, the poly(butyl methacrylate) latex particles underwent film formation leading to a smooth shell.…”

Section: Electrostatic Interactionsmentioning

confidence: 99%

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Teixeira

Bon

2010

Hybrid Latex Particles

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In this chapter, we will highlight conceptual physical approaches towards the fabrication of nanocomposite polymer latexes in which each individual latex particle contains one or more "hard" nanoparticles, such as clays, silicates, titanates, or other metal(oxides). By "physical approaches" we mean that the "hard" nanoparticles are added as pre-existing entities, and are not synthesized in situ as part of the nanocomposite polymer latex fabrication process. We will narrow our discussion to focus on physical methods that rely on the assembly of nanoparticles onto the latex particles after the latex particles have been formed, or its reciprocal analogue, the adhesion of polymer onto an inorganic nanoparticle. First, will discuss the phenomenon of heterocoagulation and its various driving forces, such as electrostatic interactions, the hydrophobic effect, and secondary molecular interactions. We will then address methods that involve assembly of nanoparticles onto or around the more liquid precursors (i.e., swollen/growing latex particles or monomer droplets). We will focus on the phenomenon of Pickering stabilization. We will then discuss features of particle interaction with soft interfaces, and see how the adhesion of particles onto emulsion droplets can be applied in suspension, miniemulsion, and emulsion polymerization. Finally, we will very briefly mention some interesting methods that make use of interface-driven templating for making well-defined assembled clusters and supracolloidal structures.

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Section: Electrostatic Interactionsmentioning

confidence: 99%

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Teixeira

Bon

2010

Hybrid Latex Particles

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“…The principles discussed in the theory section and in previous papers [15][16][17][18][19] have been used to examine experimentally the engulfment of polymer particles with a high T g into particles with a low T g . Similarly, it has been possible to engulf inorganic particles, magnetite, into PBMA particles with a low T g .…”

Section: Discussionmentioning

confidence: 99%

“…These were prepared as a latex by an emulsifier-free polymerisation [20] of styrene at 70ºC using ammonium persulphate as the initiator, as previously described [15,19]. The particles so prepared were anionic in character over the pH range utilised.…”

Section: Experimental Polystyrene (Ps) Particlesmentioning

confidence: 99%

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Surface Tension, Stickiness and Engulfment

Ottewill

Schofield

Waters

1998

Journal of Dispersion Science and Technology

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The thermodynamic conditions for the engulfment of one set of particles by another has been given in terms of interfacial energies. Experimentally, it has been shown that a polymer with a high glass transition temperature can be engulfed by a particle of low glass transition temperature; also, that inorganic particles can be engulfed by polymer particles. As a precursor to then engulfment stage heterocoagulation can be used for bringing the particles together in a "sticking" mode. This appears to be a general process which is applicable to a number of scientific areas, e.g. in biology, phagocytosis, and in material science for the preparation of composite particles.

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“…Poor performance of the binding matrix, e.g., debonding from the solid fillers, greatly compromises the efficiency of propellants. In order to improve the binding ability, a small amount of bonding agents is usually incorporated into propellants [1][2][3][4][5][6][7][8][9][10]. Ever since the 1960s, an array of bonding agents such as aziridine, alkanolamine, polyamine and their derivatives were developed for hydroxyl-terminated polybutyldiene (HTPB) propellants.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy

Hu¹,

Zhou

et al. 2014

Molecules

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Neutral polymer bonding agent (NPBA) is one of the most promising polymeric materials, widely used in nitrate ester plasticized polyether (NEPE) propellant as bonding agent. The structure and dynamics of NPBA under different conditions of temperatures and sample processing are comprehensively investigated by solid state NMR (SSNMR). The results indicate that both the main chain and side chain of NPBA are quite rigid below its glass transition temperature (T g ). In contrast, above the T g , the main chain remains relatively immobilized, while the side chains become highly flexible, which presumably weakens the interaction between bonding agent and the binder or oxidant fillers and in turn destabilizes the high modulus layer formed around the oxidant fillers. In addition, no obvious variation is found for the microstructure of NPBA upon aging treatment or soaking with acetone. These experimental results provide useful insights for understanding the structural properties of NPBA and its interaction with other constituents of solid composite propellants under different processing and working conditions.

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Preparation of core-shell polymer colloid particles by encapsulation

Cited by 106 publications

References 32 publications

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Physical Methods for the Preparation of Hybrid Nanocomposite Polymer Latex Particles

Surface Tension, Stickiness and Engulfment

Molecular Dynamics of Neutral Polymer Bonding Agent (NPBA) as Revealed by Solid-State NMR Spectroscopy

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