Soap-free synthesis for producing highly monodisperse, micrometer-sized polystyrene particles up to 6 μm

Yasuyuki Yamada, Tatsuro Sakamoto, Shunchao Gu, Mikio Konno

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

A soap-free emulsion polymerization method with the use of an amphoteric initiator, currently proposed by the authors for producing highly monodisperse, micrometer-sized polymer particles, was examined in the polymerization of styrene with a 2,2′-azobis [N-(2-carboxyethyl)-2-2-methylpropionamidine] hydrate initiator and an NH 4OH/NH 4Cl pH buffer. The pH buffer was used to control the electric surface potential of particles to maintain a stable dispersion of particles and to prevent generation of new particles during the polymerization. Addition of monomer to the reaction system during polymerization could enlarge the average size of polymer particles to 5.7 μm with a coefficient of variation of 1.5%, which is much less than the standard criteria of monodispersity, 10%.

Original languageEnglish
Pages (from-to)249-252
Number of pages4
JournalJournal of Colloid And Interface Science
Volume281
Issue number1
DOIs
Publication statusPublished - 2005 Jan 1

Keywords

  • Amphoteric initiator
  • Colloidal stability
  • Monodisperse polystyrene particle
  • Monomer addition
  • Soap-free emulsion polymerization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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