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Mechanism of formation of monodisperse polystyrene hollow particles prepared by membrane emulsification technique. Effect of hexadecane amount on the formation of hollow particles
Author(s) -
Ma GuangHui,
Omi Shinzo
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200203)179:1<223::aid-masy223>3.0.co;2-3
Subject(s) - dispersity , polystyrene , membrane emulsification , materials science , chemical engineering , hexadecane , particle (ecology) , phase (matter) , polymerization , membrane , suspension (topology) , suspension polymerization , monomer , particle size , polymer chemistry , emulsion polymerization , diffusion , emulsion , polymer , chemistry , composite material , organic chemistry , thermodynamics , biochemistry , engineering , oceanography , mathematics , physics , homotopy , pure mathematics , geology
In a previous study, it was found that monodisperse polystyrene (PSt) hollow particles can be prepared under special conditions by combining a Shirasu Porous Glass (SPG) emulsification technique and subsequent suspension polymerization process. The dispersed phase mainly containing St, hexadecane (HD), and initiator, was pressed through the uniform pores of a SPG membrane into the continuous phase to form uniform droplets. Then, the droplets were polymerized at 70°C. It was proposed that rapid phase separation between PSt and HD was a main reason responsible for the formation of hollow particle. Rapid phase separation confined the HD inside the droplets, it belonged to a non‐equilibrium morphology. In this study, HD/St ratio was increased to a high value to confirm the above proposition by promoting rapid phase separation further between HD and PSt, to prevent monomer diffusion into aqueous phase, and to obtain hollow particle with a large hole.