Preparation of monodisperse crosslinked polymelamine microcapsules by phase separation method

Eiji Kamio, Aiko Kato, Satoshi Yonemura, Tsutomu Ono, Hidekazu Yoshizawa

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Monodisperse polymelamine microcapsules were prepared by phase separation method. Control of microcapsule diameter was investigated using the uniform-sized oil-in-water emulsion droplets as the capsule core. The monodisperse emulsion droplets were prepared using the Shirasu porous glass (SPG) membrane emulsification technique. The effects of the diameter of the oil droplet and concentration of sodium dodecyl sulfate (SDS), which is a typical emulsifier in SPG membrane emulsification, on microencapsulation were investigated. The microcapsules were aggregated when oil droplets with small size were microencapsulated at high SDS concentration. To reduce the SDS concentration, the creamed emulsion was used. The monodisperse polymelamine microcapsules were successfully prepared by using the creamed emulsion. The microcapsule diameter was almost similar to the diameter of the encapsulated oil droplet. The coefficient of variation values was about 10% for all microcapsules prepared in this study. Control of microcapsule diameter was achieved in the range of 5-60 μm.

Original languageEnglish
Pages (from-to)787-793
Number of pages7
JournalColloid and Polymer Science
Issue number6-7
Publication statusPublished - Jun 2008


  • Control of capsule diameter
  • Monodisperse microcapsule
  • Phase separation method
  • Shirasuporous glass membrane
  • Sodiumdodecyl sulfate concentration

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry


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