ma991284e_si_001.pdf (55.39 kB)
Emulsion Polymerization of Voided Particles by Encapsulation of a Nonsolvent
journal contribution
posted on 2000-02-16, 00:00 authored by Charles J. McDonald, Kevin. J. Bouck, A. Bruce Chaput, Carl J. StevensThe modification of an emulsion polymerization with a water-miscible alcohol and a
hydrocarbon nonsolvent for the polymer can influence the morphology of the particles. The formation of
monodispersed particles with a hollow structure or diffuse microvoids is possible. Both kinetic and
thermodynamic aspects of the polymerization dictate which particle morphology is obtained. Complete
encapsulation of the hydrocarbon occurs provided low molecular weight polymer is formed initially in
the process. Subsequent addition of a cross-linking monomer stabilizes the morphology. The final particle
size can be defined by small nucleating latex seed particles. Monodispersed hollow particles with diameters
from 0.2 to 1 μm are possible. Void fractions as high as 50% are feasible. The phase separation of
polystyrene within the styrene−isooctane dispersion has been modeled with the Flory−Huggins theory.
The encapsulation has been discussed in terms of interaction parameters, transport processes, polymer
molecular weight, and interfacial tension effects.
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transport processes1 μ mVoided ParticlesVoid fractionsparticle morphologyhydrocarbon nonsolventComplete encapsulationweight polymertension effectsemulsion polymerizationphase separationinteraction parametersSubsequent additionparticle sizenucleating latex seed particlesEmulsion Polymerizationmonodispersed particles
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