Abstract
AbstractThe compositions of copolymers formed by reacting styrene or α‐methylstyrene (M) with lithium in tetrahydrofuran in the presence of varying amounts of alkyl dibromides (RX2) have been studied. Regular copolymers of structure are formed at 2:1 monomer to dibromide molar stoichiometry, but they become less regular and richer in monomer as the proportion of dihalide decreases. α‐Methylstyrene copolymers change systematically with reactant ratios and a series of materials can be prepared with different glass transition temperatures which can be related to the copolymer compositions. The fast rate of anionic homopropagation of styrene after consumption of the dihalide prevented pure copolymer from being prepared free of homopolystyrene. However, it is shown that the composition of the styrene copolymers is much more sensitive to the initial reactant ratios than is that of the α‐methylstyrene copolymers.
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