Polymerization linear macromers

Two-Step Polymerizations 15.3.1 ROPs Yielding Linear Macromers... 

With 2-methylpropene as M, both linear and star macromers have been prepared [92-94]. Many kinds of inifers may, of course, be used. For example Kress and Heitz prepared macromers from poly(oxytetramethylene) chains with acrylate or methacrylate end groups, by THF polymerization initiated by superacids with anhydrides as co-initiators - transfer agents [95]. 

The propensity of this bisphenol to form high yields of cyclic macromers exhibits itself in the condensation reaction of i with 4,4 -dihalo substituted diphenylketones and diphenylsulfones to produce cyclic etherketones and ethersulfones. Polymerization of the polyarylate, polyetherketone and polyethersulfone macromers can also be accomplished in the presence of anionic initiators to produce linear polymers. 

The introduction of monofunctional POSS macromers into an organic polymer by polymerization at the single reactive site leads to POSS-modified polymers. POSS macromers were incorporated in linear polymers, such as methacrylates, styrenics, norbomenes, ethylenes, propylenes, and urethanes in order to improve mechanical or thermal properties. If a multifunctional POSS with cross-linkable functions is used cross-linked materials are indeed formed. Star polymers are achieved if a multifunctional POSS unit contains initiator groups and a controlled polymerizatiOTi occurs, such as atom transfer radical polymerization. 

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