Monodisperse micron-sized cross-linked polystyrene particles. VI. Understanding of nucleated particle formation and particle growth |
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Authors: | J W Kim B S Kim K D Suh |
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Institution: | (1) Department of Industrial Chemistry College of Engineering Hanyang University Seoul 133-791, Korea e-mail: kdsuh@email.hanyang.ac.kr Tel.: +82-2-22900526 Fax: +82-2-22952102, KR |
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Abstract: | The procedure of nucleated particle formation and particle growth in dispersion polymerization was studied with the intention
of understanding the production of monodisperse polystyrene particles cross-linked with urethane acrylate (UA). The time required
for the formation of primary particles was determined exactly from the turbidity measurement of the reaction mixture with
the polymerization time. It could be found that differing from conventional divinyl cross-linkers, such as divinylbenzene,
UA had a boundary concentration where the association and coagulation of preformed nuclei with other oligomers and/or nuclei
effectively took place until the primary particle formed. Similarly to linear polystyrene particles, the particle number density
of the primary particles cross-linked with UA remained constant to the final particles. This observation verifies the suggestion
that the primary particles cross-linked with UA readily absorbed the monomers from the medium during the stage of particle
growth.
Received: 31 August 1999 Accepted: 7 January 2000 |
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Keywords: | Nucleated particle formation Urethane acrylate Turbidity measurement Boundary concentration Stage of particle growth |
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