Abstract
Abstract2‐Butene(2B) copolymerizes with 3‐heptene(3H) and 4‐methyl‐2‐pentene(4M2P) by a monomer‐isomerization copolymerization mechanism in the presence of TiCl3–(C2H5)3Al catalyst at 80°C to yield the copolymers of 1‐olefin units. By comparison, the copolymerization of 1‐butene(1B) with 4‐methyl‐1‐pentene(4M1P) was also carried out under similar conditions. The composition of the copolymers obtained from these copolymerizations was determined from the ratios of optical densities D723/D1380 and D1170/D1380 in their infrared (IR) spectra. The apparent monomer reactivity ratios for the monomer‐isomerization copolymerization of 2B with 3H and 4M2P, in which the concentration of olefin monomer in the feed was used as 2‐olefin, were determined as follows: cis‐2B(M1)/3H(M2); r1 = 4.00, r2 = 0.20: trans‐2B(M1)/3H; r1 = 3.50, r2 = 0.20; 4M2P(M1)‐trans‐2B(M2): r1 = 0.05, r2 = 9.0. These results indicate that the isomerization of 2‐olefins to 1‐olefins was important to monomer‐isomerization copolymerization.
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