... rings:ð64ÞAt a polymerization temperature of 22C, approximately 80% of the cyclopentane rings inthe polymer are trans. Table 23 shows some other examples of the polymerization of nonconjugated ... this, the polymerization of 1-phenyl-1,3-butadiene was found toproduce polymers with high contents of 3,4- but no 1,2-structures.Generally, the molecular weights are low, with a ceiling of 10 000. ... coordination of the monomer occurs with only one double bond for both isomers of pentadiene. In the presence of CrO3only the trans-isomer of pentadiene is polymerized toa crystalline polymer with...