Abstract
The influence of the nature and acid strength of two complexing agents, AIEtCl 2 and AlEt 2Cl. on the alternating copolymerization of styrene and methyl methacrylate in toluene has been investigated. With AlEtCl 2, a cationic homopolymerization of styrene, which cannot be totally suppressed, takes place concurrently with the copolymerization. In the case of AlEt 2Cl, the agreement of the experimental results with the reaction scheme previously established in the case of ethylaluminium sesquichloride (EASC) is restricted to the range of low monomer concentrations. The alternating power of both complexing agents is lower than that of EASC. None of the various mechanisms proposed up to now in the literature seems to be general enough to apply to all the systems investigated.
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