Anionic addition polymerization: Difference between revisions

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Living anionic polymerization allow the incorporation of functional [[end-group]]s, usually added to quench polymerization. End-groups that have been used in the functionalization of α-haloalkanes include [[hydroxide]], -NH₂, -OH, -SH, -CHO,-COCH₃, -COOH, and epoxides.

[[Image:AAP End Group Add.png|thumb|400px|center|Addition of hydroxide group through an epoxide.]]

An alternative approach for functionalizing end-groups is to begin polymerization with a functional anionic initiator.<ref name=HongK>Hong{{cite journal|last1=Hong|first1=K.; |last2=Uhrig, |first2=D.;|last3=Mays, |first3=J. |title=Living Anionic Polymerization. ''|journal=Curr Opin Solid State Mater Sci.'' |year=1999,|volume=4, |page=531-538. |doi=10.1016/S1359-0286(00)00011-5}}</ref> In this case, the functional groups are protected since the ends of the anionic polymer chain is a strong base. This method leads to polymers with controlled molecular weights and narrow molecular weight distributions.<ref>Quirk, R. Anionic Polymerization. In Encyclopedia of Polymer Science and Technology; John Wiley and Sons: New York, 2003.</ref>

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