Preparation of polymers with controlled architecture. Synthesis and polymerization of hyperbranched macromonomers

One of the major methods for controlling molecular architecture is by changing the number and location of branches through the formation of graft and star polymers. The synthesis of novel copolymers from macromonomers is a major field of study and has received increased recognition during the last decade. The anion generated from the 'focal point' hydroxymethyl group was used in the displacement of chloride ion from commercially available 4-chloromethyl styrene. A sterically non-demanding model compound was prepared in a similar way from benzyl alcohol, the products were easily purified by flash chromatography. Several novel copolymers were prepared by copolymerization of the macromonomers with styrene under free radical conditions (AIBN, 70°C). The copolymers were purified by precipitation into mixtures of isopropanol and acetone. The compositions of the purified copolymers were determined by ¹H NMR spectroscopy.