Novel route to styrene/p-aminostyrene copolymers
A novel route to styrene/p-aminostyrene copolymers is described that involves the introduction of amino functionality into the structure of pure monodisprese polystyrene. The simple two-step synthesis involves the introduction of a bromo group into the aromatic ring by electrophilic subsitution and then a palladium-catalyszed reation with LiN(SiMe3)2 followed by an acid and base treatment to release the free amine. All reactions are carried out at room temperature. This approach avoids the difficulties often associated with the preparation of copolymers from incompatible mono-mers. The technique also gives a product with a precisely known molecular weight and polydispersity, important parameters governing many physical properties.