AbstractA study of the copolymerization of 3‐methyl‐1‐pentene (3‐MP) and 4‐methyl‐1‐pentene (4‐MP) showed that the poly‐4‐MP crystal lattice is capable of incorporating large quantities of 3‐MP without a sharp lowering of melting point or adverse effect on physical and mechanical properties. The reactivity ratio of the two monomers in copolymerization arer(4‐MP) = 6.2 ± 0.2 andr(3‐MP) = 0.1 ± 0.1. As a result, mixed feeds containing up to 80 3‐MP produce copolymers composed primarily of repeating 4‐MP units, with a random insertion of 3‐MP monomer units. Calculations indicate that in a copolymer containing 37 3‐MP, the probability of finding a sequence of 2 units of 3‐MP is only a little better than 5. This copolymer shows a somewhat increased resistance to deformation under load than homopoly 4‐MP.
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