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

Poly(macromonomers), Homo- and Copolymerization 141
3.5
Some Other New Macromonomers
Polymerization of hexamethylcyclotrisiloxane with 3-butadienyllithium afforded
butadienyl-ended polysiloxane macromonomer, 20 [27]. Polycondensation of
a chiral methyl b-hydroxyisobutyrate at a temperature higher than 150 ˚C with
Ti(O-nBu) 4 afforded directly a biodegradable polyester macromonomer, 21 [28].
(20)
(21)
Glycopeptide macromonomers, 22, were prepared from p-vinylbenzylamineinitiated
ring-opening polymerization of sugar-substituted a-amino acid N-carboxyanhydrides
[29]. They have been copolymerized with acrylamide to afford
the corresponding sugar-grafts with molecular recognition ability.
4
Homopolymerization and Copolymerization of Macromonomers
(22)
Since macromonomers are already polymers with MW between 10 3 and 10 4 ,
their polymerization and copolymerization involves polymer-polymer reactions.
Thus a question of continuing concern has been how and why a macromonomer
is different in its reactivity from a corresponding conventional monomer
of low MW.