Modeling of Phase Inversion and Particle Stability in the Dispersion Polymerization of Methyl Methacrylate in a Non‐polar Hydrocarbon Solvent

Luciani, Carla V.; Emdadi, Laleh; Lee, Sang Yool; Baick, In Hak; Choi, Kyu Yong

doi:10.1002/mren.201100004

Cited by 5 publications

(6 citation statements)

References 34 publications

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“…Therefore, the development of a mathematical model is essential to predict the morphological characteristics of the arils of the pomegranate‐like structure. In a previous work, we have investigated the evolution of particle size distributions for a regular dispersion polymerization of MMA in n ‐hexane through a dynamic population balance equation (PBE) . The same approach is applied here to study the heterogeneous region of the suspended droplets.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Considering only homogeneous nucleation of primary sub‐particles, S 0 ( t ) can be expressed in terms of the polymerization rate in the solvent‐rich phase (i.e.,

R_{p,1} = k_{normalp} {[M]}_{1} {[{normalR}^{•}]}_{1}

) and of the volume of the primary sub‐particles ( v 0 ), as follows:

S_{0} = \frac{R_{p, 1} M_{normalM}}{{\overset{true‾}{ρ}}_{normalP} (1 - φ_{M, 2}) v_{0}^{2}}

…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The following empirical correlation has been used here to determine the critical volume of primary sub‐particles:

v_{0} (L) = 1.55 \times 10^{- 17} {r_{normalS}}^{- 2.55}

where r S is the initial weight‐based solvent to monomer ratio in the heterogeneous region of the droplet.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In order to deal with the nucleation, new bins with zero population are added at the small size end of the discretization. More details of the implementation of PBE for dispersion polymerization can be found elsewhere …”

Section: Mathematical Modelmentioning

confidence: 99%

“…Although mathematical models for the thermodynamic and kinetic phenomena governing free‐radical suspension and dispersion polymerizations are widely reported in the literature, the effect of developing an intra‐particle concentration profile within a suspended droplet and performing a starved dispersion polymerization in a micron‐sized reaction space has not been mathematically studied in the past. This paper represents our first attempt to model the complex mechanisms governing a MDSP.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of Polymer Particles with a Pomegranate‐Like Internal Structure Via Micro‐Dispersive Polymerization in a Geometrically Confined Reaction Space

Luciani¹,

Choi²

2013

Macro Theory & Simulations

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A mathematical model is presented to describe a micro‐dispersive suspension polymerization (MDSP) that yields pomegranate‐like polymer micro‐particles by inducing a local phase separation within suspended monomer micro‐droplets. A modular approach is applied to theoretically understand the morphological development. It is proposed that two distinctive polymerization regions develop within a suspended droplet: (i) an outer region close to the droplet interface where a pseudo‐homogeneous polymerization takes place to build the peel of the pomegranate‐like structure and (ii) an inner region at the particle core where a starved dispersion polymerization takes place to generate the “arils” of the pomegranate‐like structure. The model simulations agree reasonably well with the experimental results.

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Section: Mathematical Modelmentioning

confidence: 99%

“…Considering only homogeneous nucleation of primary sub‐particles, S 0 ( t ) can be expressed in terms of the polymerization rate in the solvent‐rich phase (i.e.,

R_{p,1} = k_{normalp} {[M]}_{1} {[{normalR}^{•}]}_{1}

) and of the volume of the primary sub‐particles ( v 0 ), as follows:

S_{0} = \frac{R_{p, 1} M_{normalM}}{{\overset{true‾}{ρ}}_{normalP} (1 - φ_{M, 2}) v_{0}^{2}}

…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The following empirical correlation has been used here to determine the critical volume of primary sub‐particles:

v_{0} (L) = 1.55 \times 10^{- 17} {r_{normalS}}^{- 2.55}

where r S is the initial weight‐based solvent to monomer ratio in the heterogeneous region of the droplet.…”

Section: Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of Polymer Particles with a Pomegranate‐Like Internal Structure Via Micro‐Dispersive Polymerization in a Geometrically Confined Reaction Space

Luciani¹,

Choi²

2013

Macro Theory & Simulations

Self Cite

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Spherical Pseudo‐Inverse Opal Silica with Pomegranate‐Like Polymer Microparticles as Templates

Choi

Luciani

Emdadi

et al. 2012

Macro Materials & Eng

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Spherical silica particles with pseudo‐inverse opal structure are synthesized by using pomegranate‐like polymer microparticles as templates. A micro‐dispersion polymerization occurring in the suspended monomer droplets in the presence of a silica precursor leads to the formation of nearly monodisperse polymer sub‐particles of about 1 µm size, randomly‐packed within a 30–100 µm polymer particle. The polymerization is followed by an acid‐catalyzed reaction that induces formation of silica in the interstices between the sub‐particles within a polymer particle. Spherical PIOS particles are eventually produced by selectively removing the polymer template by pyrolysis. The PIOS particles show large specific surface areas with unique pore geometry and pore size distribution.magnified image

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Effect of Agitation on Density of Poly(vinyl acetate) Particles Produced in Suspension Polymerization Reactions

Cordeiro

Peixoto

Oliveira

et al. 2014

Macro Reaction Engineering

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Poly(vinyl acetate) particles are produced through suspension polymerization reactions at different agitation speed. As expected, particle size distributions are strongly affected by the increasing speed of agitation. Surprisingly, the latter also causes the decrease of particle densities, which can be explained by encapsulation of small water droplets by the viscous reacting medium. Encapsulation of water droplets can lead to the formation of hollow particles that can be observed through microscopic analyses.

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Modeling of Phase Inversion and Particle Stability in the Dispersion Polymerization of Methyl Methacrylate in a Non‐polar Hydrocarbon Solvent

Cited by 5 publications

References 34 publications

Mathematical Modeling of Polymer Particles with a Pomegranate‐Like Internal Structure Via Micro‐Dispersive Polymerization in a Geometrically Confined Reaction Space

Mathematical Modeling of Polymer Particles with a Pomegranate‐Like Internal Structure Via Micro‐Dispersive Polymerization in a Geometrically Confined Reaction Space

Spherical Pseudo‐Inverse Opal Silica with Pomegranate‐Like Polymer Microparticles as Templates

Effect of Agitation on Density of Poly(vinyl acetate) Particles Produced in Suspension Polymerization Reactions

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