Anionic and Group Transfer Copolymerizations

In order to prepare block copolymers by sequential monomer addition, the crossover reaction must be efficient. The order of monomer addition is therefore extremely important in anionic polymerizations, since the propagating anion of the first block must be nucleophilic enough to initiate polymerization of the second monomer. Since the reactivity of the propagating anion correlates with the pA a of its conjugate acid, any monomer listed in Table 13 (such as styrene) will polymerize any monomer listed 

The ability of butadiene anions to initiate styrene polymerization, and vice versa, is 

Although block copolmers of methyl methacrylate and 6-(4 -(4 -methoxyphenyl)- 

III Molecular Engineering of Side Chain Liquid Crystalline Polymers 

Since triblock copolymers can not be synthesized anionically by a third monomer addition of styrene to the growing methacrylate anion, PS-PChEMA-PS triblock copolymers were generated by coupling the living diblock copolymers with terepthaloyl chloride before quenching/deprotection 

---