Swelling-Induced Deformation of Spherical Latex Particles

Wei, Chaoliang; Plucinski, Alexander; Nuasaen, Sukanya; Tripathi, Amit K.; Tangboriboonrat, Pramuan; Tauer, Klaus

doi:10.1021/acs.macromol.6b02379

Cited by 19 publications

(7 citation statements)

References 47 publications

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“…On the other hand, computer simulation can readily isolate and elucidate competing effects, make it an indispensable tool for establishing a clear reaction-morphology relationship. Various models [39][40][41][42][43] can predict equilibrium particle morphologies based on molecular thermodynamics. However, these equilibrium models do not provide any dynamic information and cannot reveal morphology formation.…”

Section: Introductionmentioning

confidence: 99%

Morphology evolution of Janus dumbbell nanoparticles in seeded emulsion polymerization

Chen

Demirci

et al. 2019

Journal of Colloid and Interface Science

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Emulsion polymerization is a versatile approach to produce different polymeric nanoparticle morphologies, which can be useful in a variety of applications. However, the detailed mechanism of the morphology formation is not entirely clear. We study the kinetics of nanoparticle morphology evolution during a seeded emulsion polymerization using both experimental and computational tools. Lightly crosslinked polystyrene seeds were first synthesized using dispersion polymerization. Then the seed particles were swollen in tert-butyl acrylate and styrene monomers, and subsequently polymerized into nanoparticles of dumbbell and multilobe morphologies. It was discovered that both the seed and final particle morphology were affected by the methanol concentration during the seed synthesis.Systematically adjusting the methanol amount will not only yield spherical seed particles of different size, but also dumbbell particles even without the second monomer polymerization. In addition to methanol concentration, morphology can be controlled by crosslinking density. The kinetics studies revealed an

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Section: Introductionmentioning

confidence: 99%

Morphology evolution of Janus dumbbell nanoparticles in seeded emulsion polymerization

Chen

Demirci

et al. 2019

Journal of Colloid and Interface Science

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“…When the bed expansion reaches stable and maintains for 30 s, measure the dynamic bed height H d . (3). Finally, calculate the bed voidage using eq 2…”

Section: ■ Experimentalmentioning

confidence: 99%

Fluidization of Swelling Particles at Elevated Temperatures

Guan

Yang

2023

Ind. Eng. Chem. Res.

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Semicrystalline polymer (e.g., polyethylene and polypropylene) particles may swell in solvent at elevated temperatures, inducing flow instability in operation, reactor blockage, and undesired product. Understanding the fluidization behavior of swelling particles at elevated temperatures is therefore of great significance. This work conducts an experimental study on the fluidization of polyethylene particles in an elevated-temperature liquid−solid fluidized bed. With the increase in temperature, particle swelling develops over two phases, i.e., non-cohesive swelling and cohesive swelling, which is different from the fluidization of cohesive particles in gas−solid systems. Four regimes can be identified through static bed height and pressure drop measurements, i.e., stable fluidization, noncohesive-swelling fluidization, cohesiveswelling fluidization, and full defluidization. A phase diagram was then obtained to demarcate these regimes. Furthermore, an energy balance model was proposed to predict the initial agglomerating temperature T ag of swelling particles for early warning of abnormal fluidization in practical operation.

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“…One of the classic approaches to synthesize nonspherical particles is via heterophase polymerization of monomers in the presence of cross-linked seed polymeric particles. − By taking advantage of elastic stress in the cross-linked seed structure, monomer-rich protrusions form on the surface leading to morphologies ranging from Janus to multilobed shapes depending on the surfactant type and level, interfacial tension, seed cross-linking density, and monomer concentrations in the system. − While most commonly employed, elastic stress is not required, as nonspherical particles have also been observed in systems without cross-linking via two-stage seeded emulsion polymerization. Starting with the preparation of the spherical seeds, the second-stage polymerization is carried out semibatch by slowly feeding second-stage monomers into the emulsion.…”

Section: Introductionmentioning

confidence: 99%

Tunable Multilobe Particle Geometry by Annealing-Assisted Emulsion Polymerization

Lin

Tripathi

Tsavalas

2021

ACS Appl. Polym. Mater.

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The synthesis of nonspherical polymer particles is generally challenging compared to that of spherical counterparts due to higher surface area and potential associated free-energy penalty. Here, multilobed composite polymer particles were synthesized through two-stage seeded emulsion polymerization by restricting or enabling second-stage polymer rearrangement on the surface of the seed particles. The investigation focuses on morphologies at in situ pseudo-equilibrium states toward the control of the number and shape of the lobes (patches) on seeds of different-sized scales (180, 500, 800 nm). To achieve those states, a postannealing process was found to be a critical step for reducing the number and increasing the size and spacing of the lobes on the seeds. Snowman, dumbbell, trigonal planar, and tetrahedral geometries were all individually realized. Tuning to a specific primary particle geometry is important for potential assembly applications into targeted porous suprastructures such as tissue engineering scaffolds. Interfacial free energies at all polymer and water interfaces were calculated for each geometry to rationalize the observations. Additionally, the relevant polymer diffusion coefficient during annealing was used to predict the surface diffusion time for the lobe polymer chains to rearrange for a given seed size to achieve a desired nonspherical multilobed morphology with a target number of lobes.

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Swelling-Induced Deformation of Spherical Latex Particles

Cited by 19 publications

References 47 publications

Morphology evolution of Janus dumbbell nanoparticles in seeded emulsion polymerization

Morphology evolution of Janus dumbbell nanoparticles in seeded emulsion polymerization

Fluidization of Swelling Particles at Elevated Temperatures

Tunable Multilobe Particle Geometry by Annealing-Assisted Emulsion Polymerization

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