142 Advances in Polymer Science Editorial Board: A. Abe. A.-C ...

Poly(macromonomers), Homo- and Copolymerization 159
cron-sized PMMA fine particles are uniformly dispersed in the PE bulk can be
prepared during the copolymerization.
(32)
(33)
The technique has been recently extended to polar media, especially alcohols
and their mixtures with water as a continuous phase. Kobayashi et al. [104–107]
have reported that poly(2-oxazoline) macromonomers such as 34 and 35 are very
effective for the dispersion copolymerization with styrene, MMA, and N-vinylformamide
in methanol, ethanol, and mixtures of these alcohols with water.
They reported that the particle size decreased with increasing initial macromonomer
concentration and that poly(2-oxazoline) macromonomers graft-copolymerized
are concentrated on the particle surface to act as steric stabilizers.
(34)
(35)
Dispersion copolymerizations using poly(ethylene oxide) (PEO) macromonomers
26, 27, 36 and 37 in alcoholic media have been intensively studied by
many researchers [38, 108–116]. They afford nearly monodisperse polymeric
microspheres of submicron to micron size, covered with PEO chains on their
surface. Several factors which affect the particle size and polymerization kinetics
have been systematically studied. The theoretical model for particle nucleation
in these systems has also been developed and compared with the experimental
observations, as will be presented in Sect. 6.2.
(36)
(37)