Abstract
AbstractPreparation of branched “comblike” polystyrene has been performed by two different methods derived from the anionic grafting techniques. Grafting by carbanionic initiation can be utilized: as its basis we have used statistical copolymers of styrene and p‐bromostyrene. Partial metallation of the p‐bromostyrene units is performed by naphthalene—lithium and the metallated sites are used as initiators for the polymerization of styrene. Thus, branched polystyrene samples were obtained. Grafting by carbanionic deactivation has also been applied. The “backbone” chain is a statistical copolymer of styrene and methylmethacrylate. The ester functions are used as electrophilic deactivators for “living” polystyrene chains. Easily characterizable samples of low polydispersity have been obtained, fractionated, studied by light scattering, and characterized as “comb” polymers. The advantages and disadvantages of both methods are discussed.
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