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Fabrication of Polymeric Capsules Enclosing Eletrophoretic Particle Dispersion

  • Ru Qiao (a1), Xiao Li Zhang (a2), Ri Qiu (a2), Yan Li (a2) and Young Soo Kang (a3)...

Abstract

Poly(urea-formaldehyde) capsules enclosing electrophoretic particle dispersion were formed by carrying out an in-situ polymerization reaction in an oil-in-water emulsion. The internal dispersion was composed of pigment particles Yellow-14 modified by charge control agent to have superior electrophoresis velocity and the mixture of tetrachloroethylene and sec-butylbenzene, using Span 80 as the stabilizer and emulsifier. FE-SEM, TEM, and optical microscope (OM) were performed to investigate on the capsule size and surface morphology. Contact angle measurements showed that UF prepolymer deposited at the o/w interface to form hollow capsules only when the interfacial tension is large enough.

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