Abstract (3‐Vinylphenylazo)‐methylmalonodinitrile (2) was copolymerized with styrene up to high conversion giving no remarkable change in the monomer composition. The reactions were carried out in emulsion at 5°C, in bulk at 50°C, and in solution at 60°C. The azo compound displays not only the properties of an initiator (thermolysis) and monomer (vinyl group), but also the behaviour of a retardation reagent (azo‐function) explaining the decrease of polymerization rates and of molecular weights with increasing amounts of azo compound.
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Kerber et al. (1978) studied this question.
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