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

Poly(macromonomers), Homo- and Copolymerization 161
(43)
(44)
DeSimone and his co-workers have intensively studied polymerization reactions
in an environmentally friendly solvent, CO 2 . In the presence of CO 2 -philic
silicone-based macromonomer, 45, relatively monodisperse micron-sized polymer
particles were obtained by the polymerization of MMA and styrene in supercritical
CO 2 [123].
(45)
Sosnowski et al. [124, 125] have reported that uniform biodegradable polymeric
particles with diameters of less than 5 µm can be prepared by ringopening
dispersion polymerization of L,L-lactide in heptane-dioxane mixed
solvent in the presence of poly(dodecyl acrylate)-g-poly(e-caprolactone),
which were synthesized by copolymerization of dodecyl acrylate with poly(ecaprolactone)
macromonomers, 46. It is noted that the polymer particles consist
of well-defined poly(L,L-lactide) polymers with M n »1´10 4 and
M w /M n »1.06.
(46)
Polyelectrolyte macromonomers 41, 44, 47 and 48 [120, 122, 126, 127] have
been also prepared and applied to the dispersion copolymerizations to produce
polymeric particles covered with polyelectrolyte chains. Evidently, the dependence
of the conformational properties of polyelectrolyte brush chains attached