Advanced soap-free emulsion polymerization for highly pure, micron-sized, monodisperse polymer particles

Kazuhiro Shibuya, Daisuke Nagao, Haruyuki Ishii, Mikio Konno

研究成果: Article査読

53 被引用数 (Scopus)

抄録

A previously proposed method of soap-free emulsion polymerization employing an amphoteric initiator, 2,2′-azobis[N-(2-carboxyethyl)-2- methylpropionamidine] (VA-057), was extended to synthesize micron-sized, monodisperse polystyrene (PSt) particles at low impurity levels. Initial pH values of solutions in which anionic PSt particles were formed were adjusted between neutral pH and 8.9 with a tiny amount of strong base such as NaOH to constitute a low-impurity polymerization system. Micron-sized polymer particles with a narrow size distribution were obtained in a pH range of 8.1-8.9. Different strong bases of KOH, Ca(OH)2 and tetramethylammonium hydroxide were also added to examine electrostatic interaction between PSt particles formed in the low-impurity system, indicating that surface charge density of PSt particles is an important factor to determine size distributions of PSt particles formed. Polymerizations at high styrene concentrations and an appropriate VA-057 concentration succeeded in preparation of highly pure, monodisperse PSt particles with an average size of 1.86 μm.

本文言語English
ページ(範囲)535-539
ページ数5
ジャーナルPolymer
55
2
DOI
出版ステータスPublished - 2014 1 30

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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