Emulsion Polymerization of Voided Particles by Encapsulation of a Nonsolvent

Emulsion Polymerization of Voided Particles by Encapsulation of a Nonsolvent

The 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...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecules Vol. 33; no. 5; pp. 1593 - 1605
Main Authors: McDonald, Charles J, Bouck, Kevin. J, Chaput, A. Bruce, Stevens, Carl J
Format: Journal Article
Language:English
Published: Washington, DC American Chemical Society 07-03-2000
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Non solvent
Ternary system
Phase diagram
Oil water emulsion
Void fraction
Experimental study
Seeded polymerization
Modeling
Submicron particle
Structure processing relationship
Free radical polymerization
Emulsion polymerization
Morphology
Preparation
Micron size particle
Monodispersed particle
Styrene polymer
Microencapsulation
Kinetics
Monomer
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The 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.
Bibliography:istex:95FF00EF98804C0C313EDCF3B0378FB84ECEBD84
ark:/67375/TPS-R4NHF5SJ-3
ISSN:0024-9297
1520-5835
DOI:10.1021/ma991284e