Preparation of micron‐size monodisperse polymer particles by dispersion copolymerization of styrene with poly(2‐oxazoline) macromonomer

Abstract

This article describes the preparation of micron‐size monodisperse polymer particles by dispersion copolymerization of styrene with a poly(2‐oxazoline) macromonomer in an aqueous ethanol solution. The macromonomer acted as a comonomer as well as a stabilizer. The diameter of the particles increased as the concentration of the macromonomer decreased. The higher the molecular weight of the macromonomer, the smaller the particle size. The copolymerization in the solvent containing higher water content gave smaller polymer particles. Under the condition giving the monodisperse particles, the particles volume increased linearly with the yield of the particles. From ESCA analysis of the particle surface, poly(2‐oxazoline) chains were enriched on the surface. © 1993 John Wiley & Sons, Inc.

Reactive surfactants in heterophase polymerization. Part XXI—kinetics of styrene dispersion polymerization stabilized with poly(ethylene oxide) macromonomers

“…The interest in such reactive molecules have been recently demonstrated by the group of Kobayashi [1,2]. These authors have shown that the same size of polystyrene particles (about 2 m) can be obtained upon replacing high polymers of poly(alkyl oxazoline) by macromonomers of much lower molecular weight of the same structure with a styrenic end group.…”

Nanosphere formation in copolymerization of methyl methacrylate with poly(ethylene glycol) macromonomers

“…9 -15 Kobayashi et al have reported the synthesis of polystyrene particles by dispersion copolymerization of poly(2-oxazoline) macromonomers with styrene. 11 They also prepared poly(vinyl acetate) particles using poly(2-oxazoline) macromonomers as a steric stabilizer in water. 12 Winnik et al have studied the dispersion copolymerization of styrene or n-butyl methacrylate with p-alkylstyrene terminated poly(ethylene glycol) (PEG) macromonomers in methanol/water mixed solvents.…”

Synthesis of Microspheres Stabilized Sterically with Two-Component Grafted Chains by Dispersion Copolymerizations Using Mixture of Two Macromonomers in Nonaqueous Media

“…In emulsion polymerization, the emulsifier stabilizes the water-insoluble monomer particles. Recently, preparations of monodisperse polymer particles by using a hydrophilic macromonomer have been reported, such as poly(N -vinylpyrrolidone) (2,3), poly(2-alkyl-2-oxazoline) (4,5), poly(ethylene oxide) (PEO) (3,(6)(7)(8), poly(methacrylic acid) (PMA) (9,10), and poly(acrylic acid) 1 To whom correspondence should be addressed. (11,12), instead of using a homopolymer as a stabilizer.…”