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Microsphere synthesis by dispersion copolymerization of methyl methacrylate with poly(acrylic acid) macromonomers: pH effect on microsphere formation

✍ Scribed by Koji Ishizu; Masao Yamashita; Ayako Ichimura

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
227 KB
Volume
18
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

The pH effect on microsphere formation in the dispersion copolymerization of methyl methacrylate with vinylbenzyl‐terminated poly(acrylic acid) (PAA) macromonomers is studied. The diameter of poly(methyl methacrylate) (PMMA) microspheres is minimum around pH = 8. Dynamic light scattering data indicate that the shell thickness of PAA‐grafted chains shows a maximum around this pH. The degree of expansion of PAA chains drastically affects the particle size of PMMA microspheres during the dispersion copolymerization.

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## Abstract Monodisperse poly[styrene‐__co__‐glycidyl methacrylate (GMA)] microparticles were synthesized by dispersion copolymerization in a water–ethanol medium. The effects of various polymerization parameters on the particle size and size distribution of the dispersion copolymerization were inv