Controlled cyclization of cis‐1,4‐polybutadiene‐rubber (BR) was achieved with the aid of cationic catalyst systems based on alkyl aluminium chloride and organic halide and by working in xylene solution at high temperature (T > 100°C). Different catalysts based on some Lewis acids and the main parameters of the cyclization process were investigated. Interesting gel‐free elastomers were obtained when 35–40% of the initial unsaturations disappeared. Physical and technological properties of cyclized BR revealed that a new class of elastomers was obtained displaying skid resistance and tensile properties better than those of the parent polymer. The results were accounted for in terms of polycyclic sequences randomly formed in BR chains during the cyclization process.
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Priola et al. (1980) studied this question.
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